Calculations 4 RxPrep Quiz
A babysitter brings a 9 year old girl to the emergency department. She is unarousable. Labs are ordered and an arterial blood gas (ABG) is drawn. The ABG results are as follows: What acid base disorder does the child have?
Metabolic alkalosis
A patient has the following arterial blood gas (ABG) results: pH 7.6 pCO2 60 pO2 96 HCO3 32 Oxygen saturation 97 What acid base disorder is present in this patient?
Metabolic alkalosis
What lab values are required to calculate an anion gap?
Sodium,, bicarbonate and chloride
The following lab results are obtained for a 63 year old female: BUN 52 SCr 1.6 Which of the following accurately describes this scenario?
The BUN:SCr ratio is greater than 20:1, which suggests dehydration.
A weak acid with a pKa of 8 is added to a solution with a pH of 9. Choose the correct statement:
The compound will be >50% ionized
Acetic acid has a pKa of 4.8. Which of the following statements are correct? (select all that apply)
When the pH equals the pKa there is 50% ionization. The pKa is the pH at which half the compound is protonated (H+) and half is unprotonated.
Which of the following are causes of elevated anion gap metabolic acidosis? (select all that apply)
diabetic ketoacidosis lactic acidosis salicylate toxicity
A patient has the following arterial blood gas (ABG) results: pH 7.16 pCO2 60 pO2 92 HCO3 28 Oxygen saturation 97 What acid-base disorder is present?
respiratory acidosis
Which statement best describes this patient's hydration status based on the labs provided below:
the patient appears to be dehydrated based on the BUN:Scr ratio
A patient is taking 2 calcium citrate tablets once daily. Each weighs 1,500 mg total weight. She wishes to trade her calcium tablets for the carbonate form. How many 800 mg carbonate tablets will she need to provide the same daily dose?
2
What is the correct starting dose of Zosyn for this patient?
2.25 grams IV Q6h
A patient is admitted to the hospital with a blood glucose of 395 mg/dL. An insulin infusion is initiated. If a 100mL bag containing 100 units of insulin is started at 2.5 units/hour, what is the flow rate in mL/hour?
2.5
Calculate the anion gap for a patient with the following lab values: Na 132 K 3.7 Cl 98
20
The pharmacist has an order for heparin 25,000 units in 250mL D5W to infuse at 2,000 units/hour. What is the infusion rate in mL/hour?
20
The pharmacist has an order for heparin 25,000 units in 250 mL D5W to infuse at 2,000 units/hour. The infusion set delivers 60 drops per milliliter. How many drops does the patient receive per minute?
20 drops per minute
JK is a 73 year old who weighs 95 pounds and is 63 inches tall. Her Scr is 1.5. What is her CrCl using the Cockcroft-Gault equation?
23
A 210 lb man receives Flolan 74 mL/day. His cassette is made with three Flolan 1.5 mg vials and diluted to a total volute of 100 ml. What is his dose in ng/kg/min?
24 ng/kg/min
An obese female patient is to receive 4.6 mg/kg/d of theophylline. The patient is 5'4" and weighs 245 pounds. Calculate the patient's daily dose of theophylline.
250
A patient taking hydroxyurea for sickle cell disease follows up in clinic to have a CBC with differential checked. Results show WBC = 6.2 x 10 3 cells/mm3, neutrophils 32%, bands 9%, lymphhocytes 45%, eosinophils 5%, basophils 1%, monocytes8%. Calculate the ANC for this patient.
2542
calculate the body mass index (BMI) for a male who is 6'4" tall and weighs 225 pounds.
27.4
The nurse is preparing to administer the dose of Tysabri. The nurse has IV tubing that delivers 15 drops/mL. At what rate should the Tysabri be infused in drops/min?
29
A female patient comes to the clinic. She is 5'2" tall and 156 pounds. Select the correct BMI for this patient and the corresponding classification:
29, overweight
Calculate the anion gap for a patient with the following lab values: Na 130 K4.0 Cl 105 Bands 7%
3
An order is written for 10mL of a 0.125% bupivacaine and 10mL of morphine sulfate to be mixed with 250 mL of normal saline. The infusion is to be administered over 3 hours. The IV set delivers 20 drops/mL. what flow rate (drops/minute) should be used?
30 drops/minute
A patient has the following white blood cell differential: WBC 12.2 x 10^3 Segs 15% Bands10% Calculate the patient's absolute neutrophil count.
3050
Calculate the body mass index (BMI) for a female who is 5'4" tall and weighs 180 pounds.
31
What is the pH of a solution containing 0.5 mole of the weak acid and 0.1 mole of its salt?
4.05
An 80kg patient is receiving epoprostenol at a rate of 76.8 mL/day. The concentration is 60,000 nanograms/mL. What is the dose in nanograms/kg/min?
40
GF is a 42 year old female who weighs 185 pounds and is 65 inches tall. Her Scr is 1.8. What is her CrCl using the Cockcroft-Gault equation?
44
A pharmacist adds 250 mg of drug A to 500mL of 0.9% Sodium Chloride. If the solution is administered at 1.6 mL/min, how many milligrams of drug A will the patient receive in 1 hour?
48
GL is a 66 year old male admitted to the hospital for cellulitus. What is his CrCl using the Cockcroft-Gault equation? Use ideal body weight.
48
MS is a 73 year old male who weighs 205 pounds. Calculate his CrCl using the Cockcroft-Gault equation.
62
A reconstituted solution containing 500mg of ganciclovir in 20 mL of sterile water for injection is added to 500 mL of 5% dextrose in water. The infusion is to be administered over 2 hours. If the infusion set delivers 15 drops/mL, what should the flow rate be to administer the bag over the designated time interval?
65 drops/minute
KL is 62 inches tall and weighs 225 lbs. What is her adjusted body weight (kg)?
71
A nurse is hanging a 2% lidocaine solution for a patient. If the dose is 4 mg/min, how many hours will a 100mL bag last?
8
A patient is taking 2 calcium carbonate tablets once daily. Each weighs 1,500 mg total (non-elemental) weight. She wishes to trade her calcium tablets for the citrate form. How many 750mg citrate tablets (by weight) will she need to provide the same daily dose?
8
A patient has the following white blood cell differential: WBC 2.2 Segs 18% Bands 20% Calculate the absolute neutrophil count.
836
On February 16th RS was off the floor for procedures and tests most of the morning and his 1 liter bag of IV fluid + KCl was not started until 1300. The physician wants the patient to receive the entire 20 mEq of potassium today. At what rate (mL/hr) should the fluid be run to ensure that the patient receives 20 mEq of potassium on February 16th and his 1 liter bag does not run out before midnight?
91
Which of the following statements accurately describes the pH scale?
A lower pH correlates with a high concentration of hydrogen ions in solution.
An elderly male is hospitalized with sepsis. He is 6 feet tall and 143 pounds. Select the correct BMI for this patient and the corresponding classification:
19.4, normal weight
Calculate the anion gap for a patient with the following lab values: WBC 2.3 Hgb 14.5 Hct 43.4
14
A 60 kg patient receives Remodulin 96 ng/kg/min via continuous subcutaneous infusion. She uses the 10mg/mL concentration to fill her syringe. How many milliliters per hour should her pump be programmed to deliver?
0.035mL/hr
Which of the following best represents the reference range for serum creatinine?
0.6-1.2 mg/dL
What is the pH of a solution prepared to be 0.4 M of ammonia and 0.04 M ammonium chloride (pkb for ammonia= 4.76)?
10.24
A 51 year old male is hospitalized after a motor vehicle accident. He develops a Pseudomonas aeruginosa infection. The physician orders tobramycin 1.5 mg/kg IV Q8h. calculate the tobramycin dose that will be given every 8 hours. Use the patient's IBW
110
PG is 71 inches tall and weighs 392 pounds. What is his adjusted body weight in kilograms?
116
The pharmacist has an order for heparin 25,000 units in 250 mL D5W to infuse at 2,000 units/hour. How many hours will be needed to infuse the entire bag?
12.5
At what rate (mL/hr) should the nitroprusside drip have been started on March 4th?
12.6
A patient has the following white blood cell differential: WBC 6,200 Segs 14% Bands 7% Calculate the absolute neutrophil count.
1302
The Cockcroft-Gault equation may not provide a reliable estimate of actual renal clearance in all situations. An alternate method or formula may be preferable in the following circumstances: (select all that apply)
In end stage renal disease When renal function is fluctuating rapidly In very young children
The Cockcroft-Gault equation is commonly used by pharmacists to estimate renal clearance. All of the following parameters are used in the formula Except:
blood urea nitrogen
