Dosage Calculations Assignment Quiz

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

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 mg1 hour = 60 minutes2000 mg/60 minutes = 33.333 mg/minute, rounded to 33 mg/minute

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

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?

500 : X :: 125 : 5 125X = 2,500 X = 20 ml

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.

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

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

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 mlor Use ratio and proportion: 5,000 : 1 ml :: 4,000 : XX = 0.8 ml

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? (Enter numeric value only. If rounding is required, round to the nearest whole number.)

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

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 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 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/mlNext calculate the number of mg/hour for the dose: 4 mg X 60 minutes = 240 mg/hourNext 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 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? (Enter numeric value only. If rounding is required, round to the nearest tenth.)

First using the known conversion: 1 gram = 1000 mg = 0.128 gram = 128 mgNext use the Desired/Have x 1 ml = 128 mg/40 mg x 1ml = 3.2 ml

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? (Enter numeric value only. If rounding is required, round to the nearest tenth.)

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.

The healthcare provider prescribes propofol (Diprivan) at 8 mcg/kg/minute for a client during conscious sedation. The drug is dispensed as a econdary 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? (Enter numeric value only. If rounding is required, round to the nearest tenth.)

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 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

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 hour1000/X :: 8/1X = 125 ml/hour

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? (Enter numeric value only.)

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

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 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 206 ml Ensure + 69 ml water = 275 ml (75% solution)

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

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

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.