Urinary/Renal Function/Disorder and Electrolyte Imbalance

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Which of the following urine specific gravity values would indicate to the nurse that the patient is receiving excessive IV fluid therapy? a) 1.002 b) 1.010 c) 1.025 d) 1.030

a) 1.002 A urine specific gravity of 1.002 is low, indicating dluite urine and the excretion of excess fluid. Fluid overload, diuretics, or lack of ADH can cause dilute urine. Normal urine specific gravity indicates concentrated urine that would be seen in dehydration.

Total bladder capacity ranges from _________ mL to _________ mL.

600-1000mL

A nursing instructor is reviewing with the class the steps in urine formation. Place in the correct order from first to last the sequence the instructor would present. -Filtrate enters Bowman's capsule -Plasma filtered through glomerulus -Formed urine drains from the collecting tubules, into the renal pelvis, and down each ureter to the bladder -Filtrate moves through tubular system of the nephron and is either reabsorped or excreted

-Plasma filtered through glomerulus -Filtrate enters Bowman's capsule -Filtrate moves through tubular system of the nephron and is either reabsorped or excreted -Formed urine drains from the collecting tubules, into the renal pelvis, and down each ureter to the bladder

The volume of urine in the bladder that usually causes the urge to urinate is ____ mL.

200-250 mL

A history of infection specifically caused by group A beta-hemolytic streptococci is associated with which of the following disorders? a) Acute glomerulonephritis b) Acute renal failure c) Nephrotic syndrome d) Chronic renal failure

A) Acute glomerulonephritis Acute glomerulonephritis is also associated with varicella zoster virus, hepatitis B, and Epstein-Barr virus. Acute renal failure is associated with hypoperfusion to the kidney, parenchymal damage to the glomeruli or tubules, and obstruction at a point distal to the kidney. Chronic renal failure may be caused by systemic disease, hereditary lesions, medications, toxic agents, infections, and medications. Nephrotic syndrome is caused by disorders such as chronic glomerulonephritis, systemic lupus erythematosus, multiple myeloma, and renal vein thrombosis.

Retention of which electrolyte is the most life-threatening effect of renal failure? a) Potassium b) Calcium c) Phosphorous d) Sodium

A) Potassium Retention of potassium is the most life-threatening effect of renal failure.

When preparing a client for hemodialysis, which of the following would be most important for the nurse to do? a) Check for thrill or bruit over the access site. b) Warm the solution to body temperature. c) Inspect the catheter insertion site for infection. d) Add the prescribed drug to the dialysate.

A) Check for thrill or bruit over the access site. When preparing a client for hemodialysis, the nurse would need to check for a thrill or bruit over the vascular access site to ensure patency. Inspecting the catheter insertion site for infection, adding the prescribed drug to the dialysate, and warming the solution to body temperature would be necessary when preparing a client for peritoneal dialysis.

The nurse expects which of the following assessment findings in the client in the diuretic phase of acute renal failure? a) Dehydration b) Crackles c) Hypertension d) Hyperkalemia

A) Dehydration The diuretic phase of acute renal failure is characterized by increased urine output, hypotension, and dehydration.

To assess circulating oxygen levels, the 2001 Kidney Disease Outcomes Quality Initiative: Management of Anemia Guidelines recommends the use of which of the following diagnostic tests? a) Hemoglobin b) Hematocrit c) Arterial blood gases d) Serum iron levels

A) Hemoglobin Explanation: Although hematocrit has always been the blood test of choice to assess for anemia, the 2001 Kidney Disease Outcomes Quality Initiative: Management of Anemia Guidelines, recommend that anemia be quantified using hemoglobin rather than hematocrit measurements. Hemoglobin is recommended as it is more accurate in the assessment of circulating oxygen than hematocrit. Serum iron levels measure iron storage in the body. Arterial blood gases assess the adequacy of oxygenation, ventilation, and acid-base status.

A patient with an obstruction of the renal artery causing renal ischemia exhibits HTN. One factor that may contribute to HTN: a) increase renin release b) increased ADH secretion c) decreased aldosterone secretion d) increased synthesis and release of prostaglandins

A) Increase Renin Release Renin is released in resonse to decreased B/P, renal ischemia, eosinophil chemotactic factor (ECF) depletion, and other factors affecting blood suppy to the kidney. It is they catalyst of the renin-angiotensin-aldosterone system, which raises B/P when stimulated. ADH is secreted by the posterior pituitary in response to serum hyperosmolality and low blood volume. Aldosterone is secreted within the renin-angiotensin II, and kidney prostaglandins lower B/P by causing vasodilation.

Which of the following electrolytes is a major cation in body fluid? a) Potassium b) Bicarbonate c) Chloride d) Phosphate

A) Potassium Potassium is a major cation that affects cardiac muscle functioning. Chloride is an anion. Bicarbonate is an anion. Phosphate is an anion.

A client with pancreatic cancer has the following blood chemistry profile: Glucose, fasting: 204 mg/dl; blood urea nitrogen (BUN): 12 mg/dl; Creatinine: 0.9 mg/dl; Sodium: 136 mEq/L; Potassium: 2.2 mEq/L; Chloride: 99 mEq/L; CO2: 33 mEq/L. Which result should the nurse identify as critical and report immediately? a) Potassium b) Sodium c) Chloride d) CO2

A) Potassium The nurse should identify potassium: 2.2 mEq/L as critical because a normal potassium level is 3.8 to 5.5 mEq/L. Severe hypokalemia can cause cardiac and respiratory arrest, possibly leading to death. Hypokalemia also depresses the release of insulin and results in glucose intolerance. The glucose level is above normal (normal is 75 to 110 mg/dl) and the chloride level is a bit low (normal is 100 to 110 mEq/L). Although these levels should be reported, neither is life-threatening. The BUN (normal is 8 to 26 mg/dl) and creatinine (normal is 0.8 to 1.4 mg/dl) are within normal range.

Which of the following terms is used to refer to inflammation of the renal pelvis? a) Pyelonephritis b) Interstitial nephritis c) Urethritis d) Cystitis

A) Pyleonephritis Pyelonephritis is an upper urinary tract inflammation, which may be acute or chronic. Cystitis is inflammation of the urinary bladder. Urethritis is inflammation of the urethra. Interstitial nephritis is inflammation of the kidney.

A 32-year-old flight attendant is undergoing diagnostics due to a significant drop in renal output. The physician has scheduled an angiography and you are in the midst of completing client education about the procedure. The client asks what the angiography will reveal. What is your response, as her nurse? a) Renal circulation b) Urine production c) Kidney function d) Kidney structure

A) Renal circulation A renal angiogram (renal arteriogram) provides details of the arterial supply to the kidneys, specifically the location and number of renal arteries (multiple vessels to the kidney are not unusual) and the patency of each renal artery.

A client is admitted with nausea, vomiting, and diarrhea. His blood pressure on admission is 74/30 mm Hg. The client is oliguric and his blood urea nitrogen (BUN) and creatinine levels are elevated. The physician will most likely write an order for which treatment? a) Start I.V. fluids with a normal saline solution bolus followed by a maintenance dose. b) Administer furosemide (Lasix) 20 mg I.V. c) Encourage oral fluids. d) Start hemodialysis after a temporary access is obtained.

A) Start IV fluids with normal saline solution bolus followed by a maintenance dose. Explanation: The client is in prerenal failure caused by hypovolemia. I.V. fluids should be given with a bolus of normal saline solution followed by maintenance I.V. therapy. This treatment should rehydrate the client, causing his blood pressure to rise, his urine output to increase, and the BUN and creatinine levels to normalize. The client wouldn't be able to tolerate oral fluids because of the nausea, vomiting, and diarrhea. The client isn't fluid-overloaded so his urine output won't increase with furosemide, which would actually worsen the client's condition. The client doesn't require dialysis because the oliguria and elevated BUN and creatinine levels are caused by dehydration.

A client admitted with a gunshot wound to the abdomen is transferred to the intensive care unit after an exploratory laparotomy. I.V. fluid is being infused at 150 ml/hour. Which assessment finding suggests that the client is experiencing acute renal failure (ARF)? a) Urine output of 250 ml/24 hours b) Temperature of 100.2° F (37.8° C) c) Serum creatinine level of 1.2 mg/dl d) Blood urea nitrogen (BUN) level of 22 mg/dl

A) Urine output of 250 ml/24 hours ARF, characterized by abrupt loss of kidney function, commonly causes oliguria, which is characterized by a urine output of 250 ml/24 hours. A serum creatinine level of 1.2 mg/dl isn't diagnostic of ARF. A BUN level of 22 mg/dl or a temperature of 100.2° F (37.8° C) wouldn't result from this disorder.

The client asks the nurse about the functions of the kidney. Which should the nurse include when responding to the client? Select all that apply. a) Vitamin D synthesis b) Secretion of prostaglandins c) Vitamin B production d) Secretion of insulin e) Regulation of blood pressure

A) Vitamin D synthesis B) Secretion of prostaglandins E) Regulation of blood pressure Explanation: Functions of the kidney include secretion of prostaglandins, regulation of blood pressure, and synthesis of aldosterone and vitamin D. The pancreas secretes insulin. The body does not produce Vitamin B.

The most common presenting objective symptoms of a urinary tract infection in older adults, especially in those with dementia, include? a) Hematuria b) Change in cognitive functioning c) Back pain d) Incontinence

B) Change in cognitive functioning The most common objective finding is a change in cognitive functioning, especially in those with dementia, because these patients usually exhibit even more profound cognitive changes with the onset of a UTI. Incontinence, hematuria, and back pain are not the most common presenting objective symptoms.

You are caring for a 72-year-old client who has been admitted to your unit for a fluid volume imbalance. You know which of the following is the most common fluid imbalance in older adults? a) Hypovolemia b) Dehydration c) Hypervolemia d) Fluid volume excess

B) Dehydration The most common fluid imbalance in older adults is dehydration. Because of reduced thirst sensation that often accompanies aging, older adults tend to drink less water. Use of diuretic medications, laxatives, or enemas may also deplete fluid volume in older adults. Chronic fluid volume deficit can lead to other problems such as electrolyte imbalances. Therefore, options A, C, and D are incorrect.

A nurse, when caring for a client, notes that the specific gravity of the client's urine is low. What could have lead to the low specific gravity of urine? a) Repeated diarrhea b) Excess fluid intake c) Frequent vomiting d) Urine retention

B) Excessive fluid intake Excess fluid intake results in low specific gravity of urine. Excessive fluid intake will result in formation of dilute urine. When the urine is diluted, it results in low specific gravity of urine. Frequent vomiting, repeated diarrhea, and urine retention will result in high specific gravity of urine.

A client undergoes extracorporeal shock wave lithotripsy. Before discharge, the nurse should provide which instruction? a) "Be aware that your urine will be cherry-red for 5 to 7 days." b) "Increase your fluid intake to 2 to 3 L per day." c) "Apply an antibacterial dressing to the incision daily." d) "Take your temperature every 4 hours."

B) Increase your fluid intake to 2 to 3 L per day The nurse should instruct the client to increase his fluid intake. Increasing fluid intake flushes the renal calculi fragments through — and prevents obstruction of — the urinary system. Measuring temperature every 4 hours isn't needed. Lithotripsy doesn't require an incision. Hematuria may occur for a few hours after lithotripsy but should then disappear.

Your client has a diagnosis of hypervolemia. What would be an important intervention that you would initiate? a) Give medications that promote fluid retention. b) Limit sodium and water intake. c) Teach client behaviors that decrease urination. d) Assess for dehydration.

B) Limit sodium and water intake Implement prescribed interventions such as limiting sodium and water intake and administering ordered medications that promote fluid elimination. Assessing for dehydration and teaching to decrease urination would not be appropriate interventions.

A 64-year-old client is brought in to the clinic with thirsty, dry, sticky mucous membranes, decreased urine output, fever, a rough tongue, and lethargy. Serum sodium level is above 145 mEq/L. Should the nurse start salt tablets when caring for this client? a) No, start with the sodium chloride IV. b) No, sodium intake should be restricted. c) Yes, this will correct the sodium deficit. d) Yes, along with the hypotonic IV.

B) No, sodium intake should be restricted The symptoms and the high level of serum sodium suggest hypernatremia, (excess of sodium). It is necessary to restrict sodium intake. Salt tablets and sodium chloride IV can only worsen this condition but may be required in hyponatremia (sodium deficit). Hypotonic solution IV may be a part of the treatment but not along with the salt tablets.

Which is the correct term for the ability of the kidneys to clear solutes from the plasma? a) Glomerular filtration rate (GFR) b) Renal clearance c) Specific gravity d) Tubular secretion

B) Renal Clearance Explanation: Renal clearance refers to the ability of the kidneys to clear solutes from the plasma. GFR is the volume of plasma filtered at the glomerulus into the kidney tubules each minute. Specific gravity reflects the weight of particles dissolved in the urine. Tubular secretion is the movement of a substance from the kidney tubule into the blood in the peritubular capillaries or vasa recta.

A client with a genitourinary problem is being examined in the emergency department. When palpating the client's kidneys, the nurse should keep in mind which anatomic fact? a) The kidneys are situated just above the adrenal glands. b) The left kidney usually is slightly higher than the right one. c) The kidneys lie between the 10th and 12th thoracic vertebrae. d) The average kidney is approximately 5 cm (2?) long and 2 to 3 cm (¾? to 1??) wide.

B) The left kidney usually is slightly higher than the right one The left kidney usually is slightly higher than the right one. An adrenal gland lies atop each kidney. The average kidney measures approximately 11 cm (4??) long, 5 to 5.8 cm (2? to 2¼?) wide, and 2.5 cm (1?) thick. The kidneys are located retroperitoneally, in the posterior aspect of the abdomen, on either side of the vertebral column. They lie between the 12th thoracic and 3rd lumbar vertebrae.

A urinalysis of a urine specimen that is not processed within 1 hour may result in erroneous measurement of a) glucose b) bacteria c) specific gravity d) white blood cells

B) bacteria bacteria in warm urine specimens multiply rapidly, and false or unreliable bacterial counts may occur with old urine. Glucose, specific gravity, and WBCs do not change in urine specimens, but pH becomes more alkaline, RBCs are hemolyzed, and casts may disintegrate.

A client is scheduled for a creatinine clearance test. The nurse should explain that this test is done to assess the kidneys' ability to remove a substance from the plasma in: a) 1 hour. b) 24 hours. c) 1 minute. d) 30 minutes.

C) 1 minute Explanation: The creatinine clearance test determines the kidneys' ability to remove a substance from the plasma in 1 minute. It doesn't measure the kidneys' ability to remove a substance over a longer period.

An elderly client takes 40 mg of Lasix twice a day. Which electrolyte imbalance is the most serious adverse effect of diuretic use? a) Hypophosphatemia b) Hypernatremia c) Hypokalemia d) Hyperkalemia

C) Hypokalemia Hypokalemia (potassium level below 3.5 mEq/L) usually indicates a defict in total potassium stores. Potassium-losing diuretics, such as loop diuretics, can induce hypokalemia.

Which of the following is a factor contributing to UTI in older adults? a) Low incidence of chronic illness b) Sporadic use of antimicrobial agents c) Immunocompromise d) Active lifestyle

C) Immunocompromise Factors that contribute to urinary tract infection in older adults include immunocompromise, high incidence of chronic illness, immobility, and frequent use of antimicrobial agents.

A nurse is reviewing the history of a client who is suspected of having glomerulonephritis. Which of the following would the nurse consider significant? a) History of hyperparathyroidism b) History of osteoporosis c) Recent history of streptococcal infection d) Previous episode of acute pyelonephritis

C) Recent hx of streptococcal infection Explanation: Glomerulonephritis can occur as a result of infections from group A beta-hemolytic streptococcal infections, bacterial endocarditis, or viral infections such as hepatitis B or C or human immunodeficiency virus (HIV). A history of hyperparathyroidism or osteoporosis would place the client at risk for developing renal calculi. A history of pyelonephritis would increase the client's risk for chronic pyelonephritis.

A client with renal failure is undergoing continuous ambulatory peritoneal dialysis. Which nursing diagnosis is the most appropriate for this client? a) Impaired urinary elimination b) Toileting self-care deficit c) Risk for infection d) Activity intolerance

C) Risk for infection Explanation: The peritoneal dialysis catheter and regular exchanges of the dialysis bag provide a direct portal for bacteria to enter the body. If the client experiences repeated peritoneal infections, continuous ambulatory peritoneal dialysis may no longer be effective in clearing waste products. Impaired urinary elimination, Toileting self-care deficit, and Activity intolerance may be pertinent but are secondary to the risk of infection.

A client with urinary tract infection is prescribed phenazopyridine (Pyridium). Which of the following instructions would the nurse give the client? a) "This medication will prevent re-infection." b) "This medication should be taken at bedtime." c) "This medication will relieve your pain." d) "This will kill the organism causing the infection."

C) This medication will relieve your pain Phenazopyridine (Pyridium) is a urinary analgesic agent used for the treatment of burning and pain associated with UTIs.

A client is admitted for treatment of chronic renal failure (CRF). The nurse knows that this disorder increases the client's risk of: a) a decreased serum phosphate level secondary to kidney failure. b) an increased serum calcium level secondary to kidney failure. c) water and sodium retention secondary to a severe decrease in the glomerular filtration rate. d) metabolic alkalosis secondary to retention of hydrogen ions.

C) water and sodium retention secondary to a severe decrease in the glomerular filtration rate. Explanation: The client with CRF is at risk for fluid imbalance — dehydration if the kidneys fail to concentrate urine, or fluid retention if the kidneys fail to produce urine. Electrolyte imbalances associated with this disorder result from the kidneys' inability to excrete phosphorus; such imbalances may lead to hyperphosphatemia with reciprocal hypocalcemia. CRF may cause metabolic acidosis, not metabolic alkalosis, secondary to inability of the kidneys to excrete hydrogen ions.

A client develops decreased renal function and requires a change in antibiotic dosage. On which factor should the physician base the dosage change? a) Therapeutic index b) GI absorption rate c) Liver function studies d) Creatinine clearance

D) Creatinine clearance The physician should base changes to antibiotic dosages on creatinine clearance test results, which gauge the kidney's glomerular filtration rate; this factor is important because most drugs are excreted at least partially by the kidneys. The GI absorption rate, therapeutic index, and liver function studies don't help determine dosage change in a client with decreased renal function.

Which of the following would be included in a teaching plan for a patient diagnosed with a urinary tract infection? a) Drink coffee or tea to increase diuresis b) Use tub baths as opposed to showers c) Void every 4 to 6 hours d) Drink liberal amount of fluids

D) Drink liberal amounts of fluids Patients diagnosed with a UTI should drink liberal amounts of fluids. They should void every 2 to 3 hours. Coffee and tea are urinary irritants. The patient should shower instead of bathe in a tub because bacteria in the bath water may enter the urethra.

The nurse is preparing an education program on risk factors for kidney disorders. Which of the following risk factors would be inappropriate for the nurse to include in the teaching program? a) Pregnancy b) Diabetes mellitus c) Neuromuscular disorders d) Hypotension

D) Hypotension Hypertension, not hypotension, is a risk factor for kidney disease.

Which type of incontinency refers to the involuntary loss of urine due to medications? a) Overflow b) Urge c) Reflex d) Iatrogenic

D) Iatrogenic Explanation: Iatrogenic incontinence is the involuntary loss of urine due to medications. Reflex incontinence is the involuntary loss of urine due to hyperreflexia in the absence of normal sensations usually associated with voiding. Urge incontinence is the involuntary loss of urine associated with a strong urge to void that cannot be suppressed. Overflow incontinence is the involuntary loss of urine associated with overdistention of the bladder.

A nurse is reviewing the laboratory test results of a client with renal disease. Which of the following would the nurse expect to find? a) Decreased blood urea nitrogen (BUN) b) Decreased potassium c) Increased serum albumin d) Increased serum creatinine

D) Increased serum creatinine In clients with renal disease, the serum creatinine level would be increased. The BUN also would be increased, serum albumin would be decreased, and potassium would likely be increased.

Which of the following would the nurse expect to find when reviewing the laboratory test results of a client with renal failure? a) Increased red blood cell count b) Decreased serum potassium level c) Increased serum calcium level d) Increased serum creatinine level

D) Increased serum creatinine level Explanation: In renal failure, laboratory blood tests reveal elevations in BUN, creatinine, potassium, magnesium, and phosphorus. Calcium levels are low. The RBC count, hematocrit, and hemoglobin are decreased.

After teaching a group of students about how to perform peritoneal dialysis, which statement would indicate to the instructor that the students need additional teaching? a) "The effluent should be allowed to drain by gravity." b) "It is important to use strict aseptic technique." c) "The infusion clamp should be open during infusion." d) "It is appropriate to warm the dialysate in a microwave."

D) It is appropriate to warm the dialysate in a microwave Explanation: The dialysate should be warmed in a commercial warmer and never in a microwave oven. Strict aseptic technique is essential. The infusion clamp is opened during the infusion and clamped after the infusion. When the dwell time is done, the drain clamp is opened and the fluid is allowed to drain by gravity into the drainage bag.

A nurse assesses a client shortly after living donor kidney transplant surgery. Which postoperative finding must the nurse report to the physician immediately? a) Serum sodium level of 135 mEq/L b) Serum potassium level of 4.9 mEq/L c) Temperature of 99.2° F (37.3° C) d) Urine output of 20 ml/hour

D) Urine output of 20 ml/hour Explanation: Because kidney transplantation carries the risk of transplant rejection, infection, and other serious complications, the nurse should monitor the client's urinary function closely. A decrease from the normal urine output of 30 ml/hour is significant and warrants immediate physician notification. A serum potassium level of 4.9 mEq/L, a serum sodium level of 135 mEq/L, and a temperature of 99.2° F are normal assessment findings.

A male client has doubts about performing peritoneal dialysis at home. He informs the nurse about his existing upper respiratory infection. Which of the following suggestions can the nurse offer to the client while performing an at-home peritoneal dialysis? a) Perform deep-breathing exercises vigorously. b) Avoid carrying heavy items. c) Auscultate the lungs frequently. d) Wear a mask when performing exchanges.

D) Wear a mask when performing exchanges The nurse should advise the client to wear a mask while performing exchanges. This prevents contamination of the dialysis catheter and tubing, and is usually advised to clients with upper respiratory infection. Auscultation of the lungs will not prevent contamination of the catheter or tubing. The client may also be advised to perform deep-breathing exercises to promote optimal lung expansion, but this will not prevent contamination. Clients with a fistula or graft in the arm should be advised against carrying heavy items.

An age related change in the kidney that leads to nocturia in an older adult is a) decreased renal mass b) decreased detrusor muscle tone c) decreased ability to conserve sodium d) decreased ability to concentrate urine

D) decreased ability to concentrate urine The decreased ability to concentrate urine results in an increased volume of dilute urine, which does not maintain the usual diurnal elimination pattern. A decrease in bladder capacity also contributes to nocturia, but decreased bladder muscle tone results in urinary retention. Decreased renal mass decreases renal reserve, but function is generally adequate under normal circumstances.

The sites where urinary stones are most likely to obstruct the urinary system are at the __________ and the ____________.

Ureteropelvic junction and Ureterovesical junction

A clinical situation in which the increased release of erythropoietin would be expected is: a) hypoexmia b) hypotension c) hyperkalemia d) fluid overload

a) Hypoexmia Erythropoietin is released when the oxygen tension of the renal blood supply is low and stimulates production of red blood cells in the bone marrow. Hypotension causes activation of the renin-angiotensin-aldosterone system, as well as release of ADH. Hyperkalemis stimulates release of aldosterone from the adrenal cortex, and fluid overload does not directly stimulate factors affecting the kidney.

Which nursing assessment finding indicates that the client who has undergone renal transplant has not met expected outcomes? a) Weight loss b) Fever c) Absence of pain d) Diuresis

b) Fever Fever is an indicator of infection or transplant rejection.

While caring for a 77-year old woman who has a urinary catheter, the nurse monitors the patient for the development of a UTI. The clinical manifestations the patient is most likely to experience include: a) cloudy urine and fever b) urethral burning and blood urine c) vague abdominal pain and disorientation d) suprapubic pain and slight decline in body temperature

c) vague abdominal pain and disorientation The usual classic symptoms of UTI are often absent in older adults, who tend to experience nonlocalized abdominal pain rather than dysuria and suprapubic pain. They may also experience cognitive impairment characterized by confusion or decreased level of consciousness.

A woman with no hx of UTIs who is experiencing urgency, frequency, and dysuria comes to the clinic, where a dipstick and microscopic urinalysis indicate bacteriuria. The nurse anticipates that the patient will a) need to have a blood specimen drawn for a CBC and kidney function test b) not be treated with medications unless she develops a fever, chills, or flank pain c) be requested to obtain a clean-catch midstream urine specimen for culture and sensitivity d) be treated empirically with TMP-SMX Bactrim for 3 days.

d) be treated empirically with TMP-SMX Bactrium for 3 days Unless a patient has a hx of recurrent UTIs, TMP-SMX or nitrofurantoin is usually used to empirically treat an initial UTI without a culture and sensitivity test. Asymptomatic bacteriuria does not justify tc, but symptomatic UTIs should always be treated.


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