Dosage Calculations
Exam Answer Key
Course Introduction
Dosage Calculations is a foundational course designed to equip students with the essential mathematical skills and knowledge required to accurately calculate medication dosages across various healthcare settings. Through a combination of theoretical instruction and practical exercises, students learn to interpret medication orders, convert between measurement systems, and apply formulas for oral, parenteral, and intravenous medications. Emphasis is placed on patient safety, error prevention, and critical thinking to ensure precise administration of medications. This course is vital for students pursuing careers in nursing, pharmacy, and other health professions where precise dosage calculations are critical to positive patient outcomes.
Recommended Textbook
Calculation of Drug Dosages A Work Text 10th Edition by Sheila J. Ogden RN MSN
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16 Chapters
478 Verified Questions
478 Flashcards
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2
Chapter 1: Fractions
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Sample Questions
Q1) 3/10 + 3/5 + ____________________ Answer: 9/10
Q2) 2 1/2 \(\times\) 2 1/3 = ____________________ Answer: 8 1/6
Q3) 1 5/6 + 3 1/3 + ____________________ Answer: 5 1/6
Q4) 6 1/2 - 1 3/4 = ____________________ Answer: 4 3/4
Q5) 4 3/10 ÷ 1 3/4 = ____________________ Answer: 2 16/35
Q6) 11/12 - 1/2 = ____________________ Answer: 5/12
Q7) 5/6 ÷ 1/2 = ____________________ Answer: 1 3/7
Q8) 3 1/2 ÷ 1 1/3 = ____________________ Answer: 2 5/8
Q9) 1/3 \(\times\) 3/4 = ____________________ Answer: 1/4
Q10) 5 1/2 \(\times\) 1 1/6 = ____________________ Answer: 6 5/12 Page 3
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Page 4
Chapter 2: Decimals
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Sample Questions
Q1) 110.5 ÷ 7.52 = ____________________ Answer: 14.69414894
Q2) 2.67 + 5.1 + 1.3 + 0.9 = ____________________ Answer: 9.97
Q3) 258.7 ÷ 100 = ____________________ Answer: 2.587
Q4) 120.005 \(\times\) 95.88 = ____________________ Answer: 24.125
Q5) 4.4 ÷ 0.5 = ____________________ Answer: 8.8
Q6) 0.662 \(\times\) 1000 = ____________________ Answer: 662
Q7) 1.1 + 50.6 + 30.9 + 6.75 = ____________________ Answer: 89.35
Q8) 354.6 ÷ 1000 = ____________________ Answer: 0.3546
Q9) 16.75 \(\times\) 4.6 = ____________________ Answer: 12.15
Q10) 17.5 \(\times\) 10 = ____________________ Answer: 175 Page 5
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Chapter 3: Percents
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Sample Questions
Q1) Change 0.77 to a percent.____________________ Answer: 77%
Q2) Change 16.8% to a proper fraction.____________________ Answer: 21/125
Q3) Change 15% to a decimal.____________________ Answer: 0.15
Q4) What is 15% of 1085.6? _____________________ Answer: 162.84
Q5) Change 7/16 to a percent.____________________ Answer: 43 3/4%
Q6) Change 67.9% to a decimal.____________________ Answer: 0.679
Q7) What percent of 150 is 75? ____________________ Answer: 50%
Q8) What percent of 400 is 125? ____________________ Answer: 31.25%
Q9) Change 1/4 to a percent.____________________ Answer: 25%
Q10) What is 25% of 75? ____________________ Answer: 18.75 Page 7
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Page 8
Chapter 4: Ratios
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Sample Questions
Q1) Change 3/8 ÷ 5/12 to a ratio.____________________
Q2) Change 2/7% to a ratio.____________________
Q3) Change 1/7 ÷ 4/21 to a ratio.____________________
Q4) Change 3/10:2/5 to a fraction.____________________
Q5) Change 1.66 to a ratio.____________________
Q6) Change 15:75 to a percent.____________________
Q7) Change 0.12 to a ratio.____________________
Q8) Change 44:88 to a percent.____________________
Q9) Change 25:100 to a fraction.____________________
Q10) Change 35:14 to a decimal number.____________________
Q11) Change 27% to a ratio.____________________
Q12) Change 7:20 to a decimal number.____________________
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Chapter 5: Proportions
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Sample Questions
Q1) 14 : x :: 28 : 7 ____________________
Q2) x : 0.54 :: 0.6 : 0.8 ____________________
Q3) x : 0.7 :: 21.21 : 3 ____________________
Q4) 16 : x :: 45 : 15____________________
Q5) 25 : 40 :: 75.5 : x ____________________
Q6) 2/3 : x :: 8/9 : 12 ____________________
Q7) x : 1/4 :: 3/4: 32 ____________________
Q8) 125 : 20 :: 300 : x ____________________
Q9) 30 : 600 :: x : 150 ____________________
Q10) 33% : 66 :: x% : 15 ____________________
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10
Chapter 6: Metric and Household Measurements
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Sample Questions
Q1) 1.42 mg = ____________________ mcg
Q2) 2.5 L = ____________________ mL
Q3) 1 g = __________ mg
Q4) 18 mg = ________ mcg
Q5) 9415 mcg = ____________________ mg
Q6) 3 oz = _____ mL
Q7) 1 g = ___________ mcg
Q8)
Q9) 3.36 cm = ____________________ mm
Q10) 750 mL = ____________________ L
Q11) 1 mg = _________ g
Q12) 76 mg = ____________________ mcg
Q13) 112.2 lb = ____________________ kg
Q14) 900 mg = ________ g
Q15)
Q17) 12.6 cm = _____________________ mm
Q18) 15 mg = _________ g
Q19) 1 mg = _________ mcg
Q20) 17.4 kg = ____________________ g
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Chapter 7: Calculations Used in Patient Assessments
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44 Verified Questions
44 Flashcards
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Sample Questions
Q1) 180 lb = ______ kg
Q2) 1 mg = _________ g
Q3) 20 kg = ____________________ lb
Q4) 37.8° C = ____________________° F
Q5) 150,525 mcg = ____________________ g
Q6) 9415 mcg = ____________________ mg
Q7) 112.2 lb = ____________________ kg
Q8) 3/4 cup = ____________________ fl oz
Q9) 3 oz = _____ mL
Q10) 3.5 kg = ____________________ lb
Q11) 180 mL = ____________________ fl oz
Q12) 750 mL = ____________________ L
Q13) 12.6 cm = _____________________ in
Q14) 2 1/2 cups = _____________ fl oz
Q15) 4200 g = ______ kg Q16) 1.42 mg = ____________________
Q17) 17.4 kg = ____________________ g
Q18) 220 lb = ______ kg
Q19) 123.2 lb = ____________________ kg
Q20) 1 g = ___________ mcg
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Chapter 8: Oral Dosages
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105 Flashcards
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Sample Questions
Q1) Vitamin D 4000 international units oral every day is ordered.The vitamin D is supplied in 1000-international-unit capsules.How many capsules would the nurse administer with each dose? ___________
Q2) Vitamin B<sub>12</sub> 500 mg oral every day is ordered.The vitamin B<sub>12</sub> is supplied in 250-mg tablets.How many tablets would the nurse administer with each dose? ___________
Q3) The physician orders Zantac elixir 150 mg po twice a day for heartburn.The medication is supplied in 15 mg/mL.How many milliliters will the nurse administer?
Q4) The patient has orders for trazodone 75 mg oral at bedtime.The medication is supplied as trazodone 50 mg per tablet.How many tablets of trazodone would the patient receive with each dose? _________
Q5) The physician orders potassium chloride crystals CR 60 mEq twice a day orally for hypokalemia.Potassium chloride crystals CR are available in 20-mEq tablets.How many tablets would the nurse administer with each dose? ___________
Q6) The patient has trazodone 100 mg oral at bedtime ordered.The medication is supplied as trazodone 50 mg per tablet.How many tablets of trazodone would the patient receive with each dose? _______
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Chapter 9: Parenteral Dosages
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Sample Questions
Q1) The physician orders Methergine 0.3 mg IM for postpartum bleeding.The medication is supplied in 0.2 mg/mL.How many milliliters will the nurse administer?
Q2) A physician orders Reglan 10 mg IV every 6 hours for a patient with high gastric residuals.Using a vial with a 10 mg/mL concentration,how many milliliters would be administered with each dose? ____________
Q3) A patient with renal failure has orders for Epogen 10,000 units subcutaneous every Monday,Wednesday,and Friday; hold if hemoglobin is greater than 11 g/dL.The medication is supplied in 10,000 units per 1-mL vials.How many milliliters would the nurse administer with each dose? __________
Q4) Narcan 0.8 mg IV every 30 minutes is ordered for a patient with a respiratory rate less than 8 breaths/min.The medication is available in 0.4 mg per 1-mL vials.How many milliliters would the nurse administer with each dose?
Q5) Naloxone 0.1 mg IV every 30 minutes is ordered for a respiratory rate below 8 breaths/min.The medication is available in 0.4 mg per 1-mL vials.How many milliliters would the nurse administer with each dose? __________
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Page 16
Chapter 10: Dosages Measured in Units
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Sample Questions
Q1) The physician orders heparin 5500 units subcutaneous for deep vein thrombosis prevention.The medication is supplied in 10,000 units/mL.How many milliliters will the nurse administer? ____________________
Q2) Heparin 10,000 units subcutaneous every 12 hours is ordered for a patient after a stent placement.The heparin is available in 20,000 units per 1-mL concentration.How many milliliters would the nurse administer with each dose? __________
Q3) A patient has orders for Fragmin 10,000 international units twice a day for deep vein thrombosis prevention.The Fragmin is available in 5000 international units per 0.4 milliliter vials.How many milliliters would the nurse administer with each dose?
Q4) The physician orders heparin 5000 units subcutaneous every 12 hours for a patient with a deep vein thrombosis.The heparin is available in 20,000 units per 1-mL concentration.How many milliliters would the nurse administer with each dose?
Q5) A patient has orders for Fragmin 2500 international units twice a day for deep vein thrombosis prevention.The Fragmin is available in 5000 international units per 0.4 milliliter vials.How many milliliters would the nurse administer with each dose?
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Chapter 11: Reconstitution of Medications
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Sample Questions
Q1) The physician orders Pfizerpen 750,000 units IV for an upper respiratory infection.After reconstitution,the medication is available as 500,000 units/mL.How many milliliters will the nurse administer?
Q2) The physician orders penicillin G 500,000 units IM for infection.After reconstitution,the medication is available as 1,000,000/mL.How many milliliters will the nurse administer?
Q3) The physician orders penicillin G 350,000 units IM for an infection.After reconstitution,the medication is available as 200,000 units/mL.How many milliliters will the nurse administer?
Q4) The physician orders Ancef 500 mg IV for a urinary tract infection.After reconstitution,the medication is available as 330 mg/mL.How many milliliters will the nurse administer?
Q5) The physician orders Amoxil 200 mg po for a sinus infection.After the reconstitution,the medication is available as 125 mg/5 mL.How many milliliters will the nurse administer?
Q6) The physician orders Lorabid 350 mg po for pneumonia.After reconstitution,the medication is available as 200 mg/5 mL.How many milliliters will the nurse administer?
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Chapter 12: Intravenous Flow Rates
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Sample Questions
Q1) The patient has vancomycin 750 mg ordered IV once daily for an infection.The vancomycin is available in 250 mL of NS and should infuse over 1 hour.Using tubing with a 20 gtt/mL drop factor,how many drops per minute should the vancomycin be infused?
Q2) Tygacil 50 mg IV once a day is ordered for a patient.The Tygacil is dissolved in 50 mL of NS and should infuse over 30 minutes.Using tubing with a drop factor of 20 gtt/mL,how many drops per minute should the Tygacil be infused? ___________
Q3) The physician gives orders to infuse 1 L of lactated Ringer's solution in 15 hours.Calculate the flow rate in milliliters per hour.____________________
Q4) The physician orders ampicillin 1 g in 100 mL of D<sub>5</sub>W IVPB to infuse over 20 minutes.Tubing drop factor is 15 gtt/mL.Calculate the flow rate in drops per minute.____________________
Q5) The physician orders Kefzol 2 g in 50 mL of NS IVPB to infuse over 30 minutes.Tubing drop factor is 60 gtt/mL.Calculate the flow rate in drops per minute._________
Q6) Lactated Ringer's solution 12,500 mL is to be infused in a burn patient over 8 hours.How many milliliters per hour should the IV fluids be infused? ___________
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Chapter 13: Intravenous Flow Rates for Dosages Measured
in Units
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Sample Questions
Q1) Calculate the milliliters per hour of heparin required for the continuous infusion.Order: Begin a heparin drip per the facility's protocol.The patient's weight is 80 kg.Heparin Protocol Bolus: Heparin 80 units/kg Infusion: Heparin 18 units/kg/h using a concentration of heparin 25,000 units in 250 mL of NS (100 units/mL)
Q2) Calculate the units of heparin required for the bolus dose.Round the final answer to the nearest hundredth place.Order: Begin a heparin drip per the facility's protocol.The patient's weight is 84 kg.Heparin Protocol Bolus: Heparin 70 units/kg Infusion: Heparin 17 units/kg/h using a concentration of heparin 25,000 units in 250 mL of NS (100 units/mL)
Q3) Calculate the units of heparin required for the bolus dose.Round the final answer to the nearest hundredth place.Order: Begin a heparin drip per the facility's protocol.The patient's weight is 76 kg.Heparin Protocol Bolus: Heparin 70 units/kg Infusion: Heparin 17 units/kg/h using a concentration of heparin 25,000 units in 250 mL of NS (100 units/mL)
Q4) Calculate the milliliters per hour of heparin required for the continuous infusion.Order: Begin a heparin drip per the facility's protocol.The patient's weight is 66 kg.Heparin Protocol Bolus: Heparin 80 units/kg Infusion: Heparin 18 units/kg/h using a concentration of heparin 25,000 units in 250 mL of NS (100 units/mL)
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Page 20
Chapter 14: Critical Care Intravenous Flow Rates
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Sample Questions
Q1) Round your answer to the nearest whole number.The physician orders Nipride IV drip at 3 mcg/kg/min for elevated blood pressure.The patient weighs 165 lb.The medication is supplied in 50 mg/250 mL of D<sub>5</sub>W.Calculate the flow rate in milliliters per hour.____________________
Q2) Round your answer to the nearest tenth.A patient with an admitting blood pressure of 230/140 mm Hg is receiving nitroprusside at 50 mL/h.The patient's weight is 70 kg.The nitroprusside concentration is 50 mg/250 mL of D<sub>5</sub>W.How many micrograms per kilograms per minute of nitroprusside are infusing? _____________
Q3) Round your answer to the nearest tenth.Nesiritide is infusing at 18 mL/h for a patient with congestive heart failure.The nesiritide bag has a 1.5 mg/250 mL concentration.How many micrograms per kilogram per minute is the nesiritide infusing for a 70-kg patient?
Q4) Round your answer to the nearest whole number.The physician orders a lidocaine IV drip to infuse at 3 mg/min for premature ventricular contractions.The medication is supplied in 1 g/250 mL of D<sub>5</sub>W.Calculate the flow rate in milliliters per hour.____________________
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Chapter 15: Pediatric Dosages
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Sample Questions
Q1) The physician orders ibuprofen 200 mg oral every 6 hours for a child weighing 60 lb.The ibuprofen is available in a 100 mg/5 mL concentration.The recommended dose is 5 to 10 mg/kg/dose.
a.What is the child's weight in kilograms? _______________
b.How many milligrams per kilogram per 24 hours is the patient receiving?
c.Is the order safe? _______________
d.If yes,how many milliliters are needed for each dose? __________________
Q2) The physician orders Keflex 250 mg oral every 6 hours for a child weighing 40 lb.The Keflex is available in a 250 mg/5 mL concentration.The recommended dose is 50 to 100 mg/kg/24 h divided in four doses.
a.What is the child's weight in kilograms? _____________
b.How many milligrams per kilogram per 24 hours is the patient receiving?
c.Is the order safe? ________________
d.If yes,how many milliliters are needed for each dose? ________________
Q3) A health care provider orders 500 mL of D<sub>5</sub>0.45% NS to infuse at 50 mL/h.The tubing drop factor is 60 gtt/mL.Calculate the rate in drops per minute.____________________
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Page 22
Chapter 16: Obstetric Dosages
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Sample Questions
Q1) Round the answer to the nearest whole number.A physician writes orders to induce labor with a Pitocin drip,beginning with 1 milliunit per minute.Pitocin 30 units is diluted in 500 mL of lactated Ringer's solution.The Pitocin should be infused for how many milliliters per hour? ____________
Q2) Round the answer to the nearest whole number.During shift report,the nurse states that a patient is receiving a Pitocin drip at 10 milliunits per minute.The Pitocin concentration is 50 units in 500 mL of lactated Ringer's solution.The IV pump should be set for how many milliliters per hour? ____________
Q3) Round the answer to the nearest whole number.The physician leaves orders to infuse Pitocin IV drip at 0.96 units/h.The medication is supplied in 15 units/250 mL of D<sub>5</sub>W.Calculate the flow rate in milliliters per hour.__________
Q4) Round the answer to the nearest whole number.During shift report,the nurse states that a patient is receiving a Pitocin drip at 6 milliunits per minute.The Pitocin concentration is 30 units in 1000 mL of lactated Ringer's solution.The IV pump should be set for how many milliliters per hour? _________
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