HESI: Dosage Calculations Assignment Quiz
A child who weighs 32 pounds receives a prescription for a moxicillin with clavulanate (Augmentin) 194 mg PO every 8 hours. The recommended dose is 40 mg/kg/day, and the bottle contains 125 mg/5ml. How many mg should the child receive in a 24-hour period? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Rationale The child's weight in kg (2.2 : 1 kg :: 32 pounds : X kg = 14.54 kg) is used to calculate the recommended dose (40 mg x 14.54 kg/day = 581.81 = 582 mg).The prescribed dose in 24 hours is 194 mg x 3 doses = 582 mg.
The nurse is preparing a tube feeding of Ensure 280 ml (50% solution). Full strength Ensure is available in a 240 ml can. The nurse should use how many ml of Ensure to prepare the feeding? (Enter numeric value for only. If rounding is required, round to nearest whole number.)
Using the formula D/H (Desired % / % on Hand) x Total volume desired: 50/100 x 280ml = 0.5 x 280 ml = 140 ml Ensure + 140 ml water = 280 ml (50% solution)
The healthcare provider prescribes phytonadione (AquaMEPHYTON) 250 mcg IM to be administered to an infant within 1 hour of admission to the nursery. A 0.5 ml ampule labeled 2 mg in 1 ml is available. The nurse should administer how many ml? (Enter numeric value only. If rounding is required, round to the nearest hundredth.)
Change mcg to mg, 1000 mcg = 1 mgUse ratio and proportion to calculate the dose: 2 mg : 1 ml :: 0.25 mg : X ml2X = 0.25 mgX = 0.125 =0.13 ml
A client is receiving acetaminophen (Tylenol) 0.65 gram PO every 6 hours PRN for pain. Acetaminophen is available in 325 mg tablets. How many milligrams should the nurse administer? (Enter numeric value only.)
Using the known equivalent, 1 gram = 1000 mg, the nurse should first convert the dose to the same unit of measurement, which is 0.65 grams = 650 mg.
A client is receiving an IV solution of 2 grams of medication diluted in 100 ml of normal saline over a one hour time period. How many mg of medication is the client receiving per minute? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
2 grams = 2000 mg 1 hour = 60 minutes 2000 mg/60 minutes = 33.333 mg/minute, rounded to 33 mg/minute
Mineral oil U.S.P 30 ml PO daily for 3 days is prescribed for a client who is experiencing severe constipation. The dose cup is marked in tablespoons. How many tablespoons should the nurse administer? (Enter numeric value only.)
15 ml equals 1 Tablespoon. Use the ratio equation: 15 ml : 1 Tbs :: 30 ml : X 15 / 30 :: 1 / X 15X = 30 X = 2 Tablespoons
The nurse programs an IV infusion pump of Ringer's Lactated 1,000 ml with oxytocin (Pitocin) 40 units to be delivered at 15 ml/hour. How many milliunits/minute is the client receiving? (Enter numeric value only, whole number.)
Convert units to milliunits, 40 x 1,000 = 40,000 milliunits. Using D/H x Q = 15 ml/hour: X/40,000 milliunits x 1,000 ml = 15 ml/hour (60 minutes) X/40 =15/60 60X = 600 X = 10 Fill in the blank 37.3
A client with Parkinson's disease is receiving benztropine (Cogentin) 3.5 mg PO twice daily. The medication is available in 0.5 mg tablets. How many tablets should the practical nurse administer for each dose? (Enter numeric value only.)
Rationale Using D/H: 3.5 mg / 0.5 mg = 7 tablets Fill in the blank
A client who is complaining of nausea and vomiting postoperatively receives a prescription for metoclopramide (Reglan) 10 mg IV. The medication is available in vials containing 5 mg/ml. How many mL should the nurse administer?
2ml
A client with a gastrostomy tube (GT) receives a prescription for Osmolite 1/2 strength enteral formula at 80 ml/hour. To prepare a 4 hour solution, the nurse should dilute the full-strength formula with how many ml of water? (Enter numeric value only.)
Determine the total volume needed at 80 ml/hour x 4 hours = 320 ml. Use the formula, Desired strength/strength on Hand x Volume = 50/100 x 320 = 160 ml of Osmolite enteral formula, which must be diluted to half strength. Or use ratio and proportion, Desired strength (1/2 = 1 part : 2 parts) :: Volume of full strength : Total Desire volume = 1 : 2 :: X : 320 ml 2X = 320, and X = 160 ml of Osmolite enteral formula, full strength 320 ml total volume - 160 ml of full-strength formula = 160 ml of water to create 1/2 strength or 50% concentration
A child weighing 28.4 kg is in hypertensive crisis. The healthcare provider prescibes methyldopa (Aldomet) 40 mg/kg/day IV in 4 divided doses. The pharmacy provides a 50 mg/ml injection vial. How many ml should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
First calculate the total mg dose/day: 40 mg x 28.4 kg = 1136 mg/day Next divide the total mg into the 4 dosages for the day: 1136 mg/4 doses = 284 mg/dose Using the Desired/Have formula: 284 mg/50mg x 1 ml = 5.68 ml/ dose, rounded to 5.7 ml.
The nurse plans to administer labetalol hydrochloride (Trandate) 0.3 grams PO to a client with hypertension. Trandate is available in 200 mg scored tablets. How many tablets should the nurse administer? (Enter numeric value only.)
First convert grams to milligrams using the known conversion: 1 gram = 1000 mg. 0.1 gram = 100 mg as 0.3 gram = 300 mg Next using the formula, Desired/Available x 1 tablet = 300 mg/200 mg x 1 = 1.5 tablets
A 9-month-old infant receives a prescription for digoxin 40 mcg PO daily. Digoxin Oral Solution, USP 50 mcg (0.05 mg) per ml is available. How many ml should the nurse administer? (Enter the numerical value only. If rounding is required, round to the nearest tenth.)
Using ratio and proportion, 40 mcg : X ml :: 50 mcg : 1 ml = 0.8 ml
A client who has heart failure with paroxysmal atrial tachycardia is receiving digoxin (Lanoxin) 0.45 mg IV as the inital digitalizing dose. The pharmacy provides 0.25 mg/ml. How many ml should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Using the formula D/H x Q = 0.45 mg/0.25 mg x 1 mL = 1.8 ml
A client experiencing ventricular tachycardia receives a prescription a continuous infusion of dextrose 5% in water (D5W) 1000 ml with lidocaine (Xylocaine) 2 grams at a rate of 4 mg per minute. The nurse should program the infusion pump to deliver how many ml/hour? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
First convert solution gram/ml to milligrams/ml: 2 gm/1000 ml = 2000 mg/1000 ml = 2 mg/ml Next calculate the number of mg/hour for the dose: 4 mg X 60 minutes = 240 mg/hour Next calculate the number of ml/hour needed to administer 240 mg/hour: 2000 mg: 1000 ml :: 240 mg : X ml2000/240 = 1000/XX = 120 ml/hour
A client weighing 86 kg is receiving dopamine at 8 mcg/kg/minute. The drug is dispensed as dopamine 800 mg/500 ml. The nurse should program the infusion pump to deliver how many ml/hour? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
First, change the concentration of dispensed dopamine to mcg/ml. 1 mg : 1000 mcg :: 800 mg : X mcg = 800,000 mcg/500 ml = 1600 mcg/ ml. Using the formula, prescribed dose (8 mcg/kg/minute) x 60 minute/hour x weight (86 kg) divided by the concentration of the available drug (1600 mcg/ml) = 8 x 60 x 86 divided by 1600 = 25.8 ml/hour
Amoxicillin 500 mg PO every 8 hours is prescribed for a client with an infection. The drug is available in a suspension of 125 mg/5ml. How many ml should the nurse administer with each dose? <p> <div> <font> <span> <b>Amoxicillin 500 mg PO every 8 hours is prescribed for a client with an infection. The drug is available in a suspension of 125 mg/5ml. How many ml should the nurse administer with each dose? </b> </span> </font> </div> </p>
500 : X :: 125 : 5 125X = 2,500 X = 20 ml or 500/125=4 =4x5ml = 20ml
An IV infusion of 0.9% normal saline 500 ml with ammonium chloride 0.2 mEq/ml is prescribed for a client who was admitted for an amphetamine overdose. How many mEq of ammonium chloride should the nurse use to prepare the solution? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
0.2 mEq x 500 ml = 100 mEq
A client with a Trichomonas vaginalis infection receives a prescription for metronidazole (Flagyl) 1 gram. The medication is available in 500 mg tablets. How many tablets should the nurse administer? (Enter numeric value only.)
1 gram = 1000 mg 1 tablet :: 500 mg = X tablets :: 1000 mg X = 1000/500 = 2 tablets
Oxytocin (Pitocin) 4 milliunits/minute IV is prescribed for a client with an ineffective contraction pattern. To administer the prescribed dosage, the nurse adds 20 units of oxytocin to Ringer's Lactate 1,000 ml . The infusion pump should be set to deliver how many ml/hour. (Enter numeric value only.)
4 milliunits/min x 1 unit/1000 milliunits x 1000 ml/20 units x 60 min/hr = 240,000/20,000 = 12 ml/hour
A client is receiving Dextrose 5% in Water (D5W) 1,000 ml at 75 ml/hour. The nurse hangs the bag of IV fluids at 0300. At what time, based on the 24-hour clock, should the infusion be completed? A. 1620. B. 1630. C. 0420. D. 0430.
A. 1620
Heparin protocol is prescribed for a client weighing 90 kg. Per protocol, the heparin loading dose is 60 units/kg IV rounded to the nearest 100 units, with a maximum loading dose of 4,000 units. The heparin vial is labeled 5,000 units/ml. How many ml should the nurse administer? (Enter the numeric value only. If rounding is required, round to the nearest tenth.) false Item 51164 By Sheila Duncan Heparin Protocol: Heparin loading dose: 60 units/kg IV, rounded to the nearest 100 units, followed by a maintenance infusion of 12 units/kg/hr, rounded to the nearest 100 units/hr. The maximum bolus is 4,000 units and the maximum initial infusion is 1000 units/hr.
Determine the client loading dose: 60 units x 90 kg = 5,400 unit. Per protocol, use the maximum loading dose of 4,000 units, and calculate the client's dose using the formula D/H x Q = 4,000 units / 5,000 units x 1 ml = 4/5 = 0.8 ml or Use ratio and proportion: 5,000 : 1 ml :: 4,000 : X X = 0.8 ml
A client with acute decompensated heart failure (HF) is to receive an IV infusion of 0.9% normal saline with inamrinone (Inocor) 0.1 grams/100 ml at a rate of 8 mcg/kg/minute. The client' s current weight is 183 lbs. The nurse should program the infusion pump to deliver how many ml/hour? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
First convert the weight into kilograms: 183 pounds/2.2 kg = 83 kg Next calculate the number of mcg/kg/minute: 8 x 83 = 664 mcg/min Calculate the number of mcg/hour: 664 x 60 minutes = 39,840 mcg/hour Now calculate the number of ml/hour needed to administer 39,840 mcg/hour: 100,000 mcg : 250 ml :: 39,840 mcg : X = 100,000/39,840 :: 250/X and 100,000X = 3,984,000 X = 39.84 (rounded to) 40 ml/hour
The healthcare provider prescribes a continuous infusion of dextrose 5% in water with isoproterenol (Isuprel) 2 mg in 500 ml at a rate of 5 mcg/minute for a client with cardiac arrhythmia. The nurse should program the infusion pump to deliver how many ml/hour? (Enter numeric value only. If rounding is required, round to the nearest hundredth.)
First using the known conversion 1 mg = 1000 micrograms. Next, calculate the number of micrograms in solution: 1mg = 1000 mcg :: 2 mg = 2000 mcg Then calculate how many ml of solution contain 5 mcg dose/minute: 2000 mcg : 500ml :: 5 mcg : X ml 2000/5 :: 500/X X = 1.25 ml/minute Calculating ml/hour: 1.25 ml x 60 minutes = 75 ml/hour
A client with multiple sclerosis and muscle spasms receives a prescription for baclofen (Kemstro) 30 mg PO daily. The medication is supplied from the pharmacy in 20 mg scored tablets. How many tablets should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Use ratio and proportion, 30 mg : X tablets = 20 mg : 1 tablet 20X = 30 X = 1.5
The nurse needs to calculate a client's oral temperature of 99.2??? Fahrenheit to Celsius. What temperature in Celsius should the nurse document? (Enter numeric value only. Round to the nearest tenth.)
Use the formula to convert Fahrenheit to Celsius, Fahrenheit temperature (99.2) minus 32 divided by 1.8 = 37.3 degrees Celsius.
A client with dehydration receives a prescription for an IV of Lactated Ringer's 1,000 ml to be administered over 8 hours. The nurse should program the infusion pump to deliver how many ml/hour? (Enter numeric value only, using whole number.)
Use the ratio of: 1000 ml : 8 hours :: X : 1 hour 1000/X :: 8/1 X = 125 ml/hour
A client with impetigo receives a prescription for azithromycin (Zithromax) 500 mg PO on day 1, then 250 mg/day on days 2 through 5 for a total administration of 1.5 gram. The pharmacy has 250 mg tablets available. How many tablets total should the nurse give to the client for the duration of treatment? (Enter numeric value only.)
Using Desired/Have available formula: 500 mg/250 mg x 1 times a day = 2 tablets on Day 1. Days 2 to 5: 1 tablet each day = 4 tablets. 2+4 = 6.
A 110-pound, adult female is admitted to the Emergency Center after receiving burns to 40 percent of her body. Using the Parkland formula, the client's fluid requirements for the first 24 hours after injury is calculated using Lactated Ringer's 4 ml solution x Body weight (in kilograms) x Percent burn. The client should receive one-half of the 24-hour calculated fluid volume in the first 8 hours of treatment. The nurse should set the infusion pump to deliver how many ml/hour during the first 8 hours? (Enter the numerical value only. If rounding is required, round to the nearest whole number.)
Using the Parkland formula, the client's fluid requirements for the first 24 hours after injury is calculated using 4 ml lactated Ringer's solution x Body weight (in kilograms) x Percent burn Convert 110 pounds to kg = 110 / 2.2 = 50 kg 4 ml x 50 kg x 40 = 8,000 ml One-half in first 8 hours = 4,000 ml 4,000 ml / 8 hours = 500 = 500 ml/hour
The healthcare provider prescribes furosemide (Lasix) 25 mg IV. The drug is available in a solution of 40 mg/4ml. How many ml should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Using the formula D/H x Q: 25 mg/40 mg x 4 ml = 2.5 ml
A client who had a small bowel resection two weeks ago is receiving 3/4 strength Ensure feedings 275 ml every 4 hours via nasogastric tube. Full strength Ensure is available in a 240 ml can. The nurse should use how many ml of Ensure to prepare the feeding? (Enter numeric value only. Round to nearest whole number if needed.)
Using the formula Desired % / on Hand % x Volume Desired = 75/100 x 275 = 0.75 x 275 = 206 Ensure
An adult client with myasthenia gravis is receiving pyridostigmine (Mestinon) 126 mg PO every 4 hours. The drug is available as 60 mg in 5 ml syrup. How many ml should the nurse administer? (If rounding is required, round to the nearest tenth.)
Using the formula, Desired dose / dose on Hand x Quantity of volume on hand (D/H x Q) 126 mg / 60 mg x 5 ml = 10.5 ml
A client with coronary artery disease receives a prescription for clopidogrel (Plavix) 300 mg PO. The medication is available in 75 mg tablets. How many tablets should the nurse administer? (Enter numeric value only.)
Using the formula, Desired/Have: 300 mg/75 mg = 4 tablets
A client who weighs 65 kg is receiving an infusion of Dextrose 5% in Water (D5W) 250 ml with dopamine 400 mg at 12 ml/hour. How many mcg/kg/minute is the client receiving? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Using the formula, mg/ml x 1000 ml x ml/hour / 60 / kg = mcg/kg/minute400/250 x 1000 x 12 / 60 / 65 = 4.9 mcg/kg/minute The solution on hand is 1.6 mg/ml x 12 hours = 19.2 mg19.2 mg x 1000 mcg = 19,200 mcg / 65 kg = 295.38 / 60 minutes = 4.92 = 4.9
The healthcare provider prescribes thiamine HCL 0.03 grams IM TID for a client with beriberi. Thiamine is available for injection 100 mg/ml. The nurse should prepare to administer how many ml? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Using the known conversion: 1 gram = 1000 mg as 0.03 gram = 30 mg Next, using the Desired / Have x 1 ml formula: 30 mg / 100 mg x 1 ml = 0.3 ml