Dosage Calculations Assignment Quiz

A client returning from surgery has a prescription for an IV of 0.9% sodium chloride to be infused at 250 ml over 3 hours. 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.)

83

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 nurse administer for each dose?

Using D/H: 3.5 mg / 0.5 mg = 7 tablets

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?

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 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?

Using the formula Desired % / on Hand % x Volume Desired = 75/100 x 275 = 0.75 x 275 = 206 Ensure 206 ml Ensure + 69 ml water = 275 ml (75% solution)

The nurse is preparing to administer vancomycin (Vancocin) 750 mg in 250 ml of Dextrose 5% in Water (D5W) over 75 minutes. The secondary infusion pump should be programmed to administer how many ml/hour? (Enter numeric value only. If rounding is required, round to the nearest whole number.)

200

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.)

12

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 receives a prescription for tobramycin sulfate (Nebcin) 0.128 grams IV every 8 hours. Tobramycin is available in liquid concentration of 40 mg/ml. How many ml should the nurse administer?

3.2

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

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.)

2

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?

1.5

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.)

10.5

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?

Convert 110 pounds to kg = 110 / 2.2 = 50kg 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

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?

Determine the total volume needed at 80 ml/hour x 4 hours = 320 ml. Use the formula, Order/On Hand x Volume = 50/100 x 320 = 160 ml Or use ratio & 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 full strength 320ml total volume - 160 ml of full-strength formula = 160 ml of water to create 1/2 strength or 50% concentration

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?

First convert the weight into kilograms: 183 pounds/2.2 kg = 83 kgNext calculate the number of mcg/kg/minute: 8 x 83 = 664 mcg/minCalculate the number of mcg/hour: 664 x 60 minutes = 39,840 mcg/hourNow 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 = 3,984,000X = 39.84 (rounded to) 40 ml/hour

A client receives a prescription for levothyroxine sodium (Synthroid) 0.05 mg by mouth once daily. The medication is available in scored tablets labeled 0.1 mg. How many tablets should the nurse administer?

0.5

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?

5.7

The nurse needs to calculate a client's oral temperature of 99.2??? Fahrenheit to Celsius. What temperature in Celsius should the nurse document?

37.3

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?

0.3

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?

125

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?

300 mg/75 mg = 4 tablets

The healthcare provider prescribes a continuous feeding of half strength Osmolite 240 ml to be infused every 4 hours for a client with a gastrostomy tube (GT). The nurse should program the enteral pump to deliver how many ml/hour?

60

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.)

75

The healthcare provider prescribes diltiazem (Cardizem) 0.87 mg PO four times daily for an infant who weighs 22 pounds. The recommended maximum dose is 3.5 mg/kg/day. What action should the nurse take?

Calculate the recommended maximum dose, 22 pounds = 10 kg, so 3.5 mg x 10 kg = 35 mg.Calculate the prescribed daily dose. 0.87 mg x 4 doses = 3.48 = 3.5 mg/day.The prescribed daily dose 3.5 mg/day is below the recommended dose of 35 mg, which may be a misplaced decimal in the prescription. The healthcare provider should be notified for clarification of the dosage.

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.)

1.8

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.)

33

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?

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/minuteThe 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

A client with hypernatremia is to receive an IV infusion of 1000 ml 5% dextrose in water to be infused over 6 hours. The nurse should program the infusion pump to deliver how many ml/hour?

167

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.)

2.5

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?

1 gram = 1000 mg1 tablet :: 500 mg = X tablets :: 1000 mgX = 1000/500 = 2 tablets

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 =15/6060X = 600X = 10

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

A client scheduled for a stress echocardiogram is to receive an IV infusion of Dextrose 5% in Water (D5W) with dobutamine (Dobutrex) 0.5 grams/250 ml at a rate of 1,200 mcg/minute. The nurse should program the infusion pump to deliver how many ml/hour?

First calculate the number of mcg/hour: 1,200 x 60 minutes = 72,000 mcg/hourNext calculate the number of ml/hour needed to administer 72,000 mcg/hour500,000 mcg : 250 ml :: 72,000 mcg : X500,000 / 72,000 :: 250 / X500,000X = 18,000,000X = 36 ml/hour

A child who weighs 32 pounds receives a prescription for amoxicillin 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?

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.

A client who has preeclampsia receives a prescription for an IV infusion of 0.9% normal saline with magnesium sulfate 4 gram/250 ml to be infused at a rate of 125 ml/hour. The nurse should administer how many mg/hour of magnesium sulfate? (Enter numeric value only. If rounding is required, round to the nearest whole number.)

To calculate the amount of medication being delivered each hour: First convert grams to mg: 1 gram = 1000 mg :: 4 grams = 4000 mgNext calculate number of mg delivered/hour4000 mg : 250 ml :: X mg : 125 ml4000/X :: 250/12550000= 250XX = 2000 mg/hour

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?

Using ratio and proportion, 40 mcg : X ml :: 50 mcg : 1 ml = 0.8 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.)

First convert solution gram/ml to mg/ml: 2gm/1000ml = 2000mg/1000ml = 2 mg/ml Next calculate # of mg/hr for the dose: 4 mg X 60 mins = 240 mg/hour Next calculate # ml/hr to give 240 mg/hr: 2000 mg: 1000 ml :: 240 mg : X ml 2000/240 = 1000/XX = 120 ml/hour

The healthcare provider prescribes the adjustment of the IV hourly rate based on the nasogastric tube (NGT) output every 4 hour for a client who had abdominal surgery yesterday. From 1200 to 1600, the NGT output was 240 ml, and the IV ofDextrose 5% in 0.45% Sodium chloride (D51/2 NS) was infused at a rate of 100 ml/hour. At 1600 the nurse should regulate the IV to deliver how many ml/hour to replace this fluid loss?

To calculate the hourly rate of IV fluid replacement based on the last 4 hours of NGT output, the nurse should calculate an average hourly output by dividing 240 ml by 4 hours = 60 ml NGT output every 1 hour. The nurse should then add the 60 ml loss per hour to the present infusion rate of 100 ml/hr, totaling an infusion rate of 160 ml/hour for the next 4 hours.

The healthcare provider prescribes an intermittent infusion of nafcillin (Unipen) 800 mg IV for a pediatric client. The drug is dispensed in a concentration of 250 mg/ml, and the recommended infusion concentration is 40 mg/ml. When adding the prescribed dose to the volume control device, how many ml of IV solution should the nurse add to dilute?

First, calculate the amount of milliliters of medication needed to provide 800 mg of nafcillin. Prescribed dose (800 mg) divided by dose on hand (250 mg/ml) equals 3.2 mlNext, determine the recommended concentration using equivalent fractions. 800 mg/X = 40 mg/1 ml40X = 800 = 20 ml (the total volume at the recommended concentration)20 ml (total volume) minus the 3.2 ml (800 mg dose) equals an additional 16.8 ml of fluid to be added to the volume control device to obtain the recommended concentration.

A healthcare provider prescribes an IV infusion of 0.9% normal saline 1,000 ml with oxytocin (Pitocin) 30 units at a rate of 1 mu/minute for a client at 42-weeks gestation. 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.)

2

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?

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

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?

1.5

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?

20mls

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.) Item 51164 By Sheila DuncanHeparin 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 mlor Use ratio and proportion: 5,000 : 1 ml :: 4,000 : XX = 0.8 ml

A client admitted to the unit from the emergency room receives a prescription for an IV infusion of 0.9% sodium chloride 1,000 ml at 750 ml/4 hours. The IV administration set delivers 60 gtts/ml. The nurse should regulate the infusion to deliver how many gtts/minute? (Enter numeric value only. If rounding is required, round to the nearest whole number.)

First convert hours to minutes: 4 hours x 60 = 240 minutesUsing formula Volume/Time x gtt factor: 750 ml/240 min = 3.125 x 60gtts = 187.5 (rounding to) 188 gtts/minute

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?

First, change concentration to mcg/ml. 1 mg : 1000 mcg :: 800 mg : X mcg = 800,000 mcg/500 ml = 1600 mcg/ ml. Using formula, (8 mcg/kg/minute) x 60 min/hr x 86 kg divided by concentration of available drug (1600 mcg/ml) = 8 x 60 x 86 divided by 1600 = 25.8 ml/hour

The healthcare provider prescribes propofol (Diprivan) at 8 mcg/kg/minute for a client during conscious sedation. The drug is dispensed as a secondary infusion labled, 0.9% normal saline 50 ml with propofol 100 mg/50 ml The client's weight is 198 pounds. The nurse should program the infusion pump to deliver how many ml/hour?

The client's weight in kg is 90 kg (198 pounds / 2.2 pounds).Next, determine the total mcg in the NS infusion (1 mg : 1000 mcg :: 100 mg : 100,000 mcg)and the IV concentration per ml (100,000 mcg : 50 ml :: X mcg : 1 ml). 100,000 / 50 = 2000 mcg/ml.Then, calculate the prescribed dose (mcg/kg/min) x 60 min/hour x kilograms divided by concentration (mcg/ml).8 x 90 x 60 divided by 2000 = 21.6 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?

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.

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)