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## Dosage Calculations for
Nurses: Exam-Style Problems
1. A provider orders furosemide 40 mg IV push. The available vial is labeled furosemide 10 mg/mL. How many milliliters should the nurse administer? A) 2 mL B) 3 mL C) 4 mL D) 5 mL 💫ANSWER✔️ ✔️ : C – 40 mg ÷ 10 mg/mL = 4 mL.
2. A patient is prescribed heparin 5,000 units subcutaneously. The vial is labeled heparin 10, units/mL. How many milliliters should the nurse draw up? A) 0.3 mL B) 0.5 mL C) 0.75 mL D) 1 mL 💫ANSWER✔️ ✔️ : B – 5,000 units ÷ 10,000 units/mL = 0.5 mL.
3. A patient is to receive 1,000 mL of normal saline over 8 hours. The IV tubing has a drop factor of 15 gtt/mL. Calculate the drops per minute.
A) 21 gtt/min B) 31 gtt/min C) 42 gtt/min D) 125 gtt/min 💫ANSWER✔️ ✔️ : B – 1,000 mL ÷ 8 hours = 125 mL/hr. 125 mL/hr ÷ 60 min = 2.083 mL/min. 2.083 × 15 gtt/mL = 31.25 ≈ 31 gtt/min.
4. A child weighs 22 kg. The ordered dose of amoxicillin is 40 mg/kg/day divided every 8 hours. How many milligrams should the nurse administer per dose? A) 220 mg B) 293 mg C) 440 mg D) 880 mg 💫ANSWER✔️ ✔️ : B – 22 kg × 40 mg/kg/day = 880 mg/day. 880 mg ÷ 3 doses = 293.3 mg per dose.
5. A patient is prescribed digoxin 0.125 mg orally. The available tablets are digoxin 0.25 mg. How many tablets should the nurse administer? A) 0.25 tablet B) 0.5 tablet C) 1 tablet D) 2 tablets 💫ANSWER✔️ ✔️ : B – 0.125 mg ÷ 0.25 mg/tablet = 0.5 tablet.
9. A patient is prescribed warfarin 7.5 mg orally. The pharmacy sends warfarin 5 mg tablets. How many tablets should the nurse administer? A) 0.5 tablet B) 1 tablet C) 1.5 tablets D) 2 tablets 💫ANSWER✔️ ✔️ : C – 7.5 mg ÷ 5 mg/tablet = 1.5 tablets.
10. An infant weighs 8 kg. The order is for IV fluids at 100 mL/kg/day. How many milliliters per hour should the nurse set the pump? A) 25 mL/hr B) 33 mL/hr C) 42 mL/hr D) 50 mL/hr 💫ANSWER✔️ ✔️ : B – 8 kg × 100 mL/kg/day = 800 mL/day. 800 mL ÷ 24 hours = 33.3 mL/hr ≈ 33 mL/hr.
11. A patient is prescribed lorazepam 2 mg IV push. The vial is labeled lorazepam 4 mg/mL. How many milliliters should the nurse administer? A) 0.25 mL B) 0.5 mL C) 1 mL D) 2 mL 💫ANSWER✔️ ✔️ : B – 2 mg ÷ 4 mg/mL = 0.5 mL.
12. A provider orders 0.9% normal saline at 150 mL/hr. The IV tubing has a drop factor of 20 gtt/mL. Calculate the drops per minute. A) 25 gtt/min B) 50 gtt/min C) 75 gtt/min D) 100 gtt/min 💫ANSWER✔️ ✔️ : B – 150 mL/hr ÷ 60 min = 2.5 mL/min. 2.5 × 20 gtt/mL = 50 gtt/min.
13. A patient weighs 75 kg. The order is for a heparin bolus of 80 units/kg IV. How many units should the nurse administer? A) 4,000 units B) 5,000 units C) 6,000 units D) 7,500 units 💫ANSWER✔️ ✔️ : C – 75 kg × 80 units/kg = 6,000 units.
14. A child is prescribed cefdinir 14 mg/kg/day divided every 12 hours. The child weighs 15 kg. The available concentration is 125 mg/5 mL. How many milliliters should the nurse administer per dose? A) 2.1 mL B) 4.2 mL C) 8.4 mL D) 10 mL
D) 1,200 mL 💫ANSWER✔️ ✔️ : C – 75 mL/hr × 12 hours = 900 mL.
18. A patient is prescribed insulin regular 12 units subcutaneously. The insulin vial is labeled U- 100 (100 units/mL). How many milliliters should the nurse draw up? A) 0.08 mL B) 0.12 mL C) 0.2 mL D) 0.5 mL 💫ANSWER✔️ ✔️ : B – 12 units ÷ 100 units/mL = 0.12 mL.
19. A patient is to receive 1.5 L of D5W over 10 hours. The nurse will set the IV pump at how many milliliters per hour? A) 100 mL/hr B) 125 mL/hr C) 150 mL/hr D) 250 mL/hr 💫ANSWER✔️ ✔️ : C – 1.5 L = 1,500 mL. 1,500 mL ÷ 10 hours = 150 mL/hr.
20. A patient weighs 65 kg. The order is for a dobutamine infusion at 5 mcg/kg/min. The pharmacy sends dobutamine 500 mg in 250 mL of D5W. Calculate the infusion rate in mL/hr. A) 9.75 mL/hr B) 19.5 mL/hr C) 29.25 mL/hr
D) 39 mL/hr 💫ANSWER✔️ ✔️ : A – Concentration: 500 mg ÷ 250 mL = 2 mg/mL = 2,000 mcg/mL. Dose: 5 mcg/kg/min × 65 kg = 325 mcg/min. 325 mcg/min × 60 = 19,500 mcg/hr. 19,500 mcg/hr ÷ 2,000 mcg/mL = 9.75 mL/hr.
21. A child is prescribed acetaminophen 15 mg/kg/dose every 6 hours PRN for fever. The child weighs 28 kg. The available concentration is 160 mg/5 mL. How many milliliters should the nurse administer per dose? A) 8.5 mL B) 10.5 mL C) 13.1 mL D) 17.5 mL 💫ANSWER✔️ ✔️ : C – 28 kg × 15 mg/kg = 420 mg/dose. 420 mg ÷ (160 mg/5 mL) = 420 mg × ( mL/160 mg) = 13.125 mL ≈ 13.1 mL.
22. A patient is prescribed metoclopramide 10 mg IV push. The vial is labeled metoclopramide 5 mg/mL. How many milliliters should the nurse administer? A) 0.5 mL B) 1 mL C) 2 mL D) 2.5 mL 💫ANSWER✔️ ✔️ : C – 10 mg ÷ 5 mg/mL = 2 mL.
26. A patient is prescribed vancomycin 1,250 mg IV every 12 hours. The vial is reconstituted to 50 mg/mL. How many milliliters should the nurse withdraw? A) 12.5 mL B) 20 mL C) 25 mL D) 50 mL 💫ANSWER✔️ ✔️ : C – 1,250 mg ÷ 50 mg/mL = 25 mL.
27. A patient is to receive 3,000 units of heparin subcutaneously. The vial is labeled heparin 5, units/mL. How many milliliters should the nurse administer? A) 0.3 mL B) 0.6 mL C) 1 mL D) 1.5 mL 💫ANSWER✔️ ✔️ : B – 3,000 units ÷ 5,000 units/mL = 0.6 mL.
28. An infant weighs 6 kg. The maintenance fluid rate is 100 mL/kg/day. How many milliliters per hour should the nurse set the IV pump? A) 15 mL/hr B) 20 mL/hr C) 25 mL/hr D) 30 mL/hr 💫ANSWER✔️ ✔️ : C – 6 kg × 100 mL/kg/day = 600 mL/day. 600 mL ÷ 24 hours = 25 mL/hr.
29. A patient is prescribed fentanyl 50 mcg IV push. The vial is labeled fentanyl 100 mcg/2 mL. How many milliliters should the nurse administer? A) 0.5 mL B) 1 mL C) 1.5 mL D) 2 mL 💫ANSWER✔️ ✔️ : B – Concentration: 100 mcg ÷ 2 mL = 50 mcg/mL. 50 mcg ÷ 50 mcg/mL = 1 mL.
30. A patient is to receive 1.2 L of IV fluids over 16 hours. How many milliliters per hour will the nurse set? A) 50 mL/hr B) 75 mL/hr C) 100 mL/hr D) 125 mL/hr 💫ANSWER✔️ ✔️ : B – 1.2 L = 1,200 mL. 1,200 mL ÷ 16 hours = 75 mL/hr.
31. A child weighs 19 kg. The order is for IV ceftriaxone 50 mg/kg/day divided every 12 hours. How many milligrams should the nurse administer per dose? A) 475 mg B) 500 mg C) 950 mg D) 1,000 mg 💫ANSWER✔️ ✔️ : A – 19 kg × 50 mg/kg/day = 950 mg/day. 950 mg ÷ 2 doses = 475 mg/dose.
35. A patient is receiving an IV infusion of 0.9% normal saline at 125 mL/hr. The IV tubing has a drop factor of 20 gtt/mL. Calculate the drops per minute. A) 21 gtt/min B) 31 gtt/min C) 42 gtt/min D) 52 gtt/min 💫ANSWER✔️ ✔️ : C – 125 mL/hr ÷ 60 = 2.083 mL/min. 2.083 × 20 = 41.66 ≈ 42 gtt/min.
36. A patient is prescribed morphine 8 mg IV push. The vial is labeled morphine 10 mg/mL. How many milliliters should the nurse administer? A) 0.4 mL B) 0.8 mL C) 1 mL D) 1.2 mL 💫ANSWER✔️ ✔️ : B – 8 mg ÷ 10 mg/mL = 0.8 mL.
37. A patient is to receive 750 mL of D5LR over 12 hours. How many milliliters per hour should the nurse set the pump? A) 42.5 mL/hr B) 52.5 mL/hr C) 62.5 mL/hr D) 72.5 mL/hr 💫ANSWER✔️ ✔️ : C – 750 mL ÷ 12 hours = 62.5 mL/hr.
38. A child weighing 33 kg is prescribed IV fluids at 80 mL/kg/day. How many milliliters per hour should the nurse set the pump? A) 88 mL/hr B) 100 mL/hr C) 110 mL/hr D) 132 mL/hr 💫ANSWER✔️ ✔️ : C – 33 kg × 80 mL/kg/day = 2,640 mL/day. 2,6 40 mL ÷ 24 hours = 110 mL/hr.
39. A patient is prescribed levetiracetam 1,000 mg IV push. The vial is labeled levetiracetam 100 mg/mL. How many milliliters should the nurse administer? A) 5 mL B) 7.5 mL C) 10 mL D) 12.5 mL 💫ANSWER✔️ ✔️ : C – 1,000 mg ÷ 100 mg/mL = 10 mL.
40. A patient is to receive 150 mg of amiodarone IV push. The vial is labeled amiodarone 50 mg/mL. How many milliliters should the nurse withdraw? A) 1 mL B) 2 mL C) 3 mL D) 4 mL 💫ANSWER✔️ ✔️ : C – 150 mg ÷ 50 mg/mL = 3 mL.
44. A patient is prescribed insulin lispro 8 units subcutaneously. The insulin vial is U-100. How many milliliters should the nurse draw up? A) 0.04 mL B) 0.08 mL C) 0.12 mL D) 0.2 mL 💫ANSWER✔️ ✔️ : B – 8 units ÷ 100 units/mL = 0.08 mL.
45. A patient is receiving an IV infusion at 50 mL/hr. How many milliliters will infuse in 8 hours? A) 300 mL B) 400 mL C) 500 mL D) 600 mL 💫ANSWER✔️ ✔️ : B – 50 mL/hr × 8 hours = 400 mL.
46. A patient is prescribed hydromorphone 2 mg IV push. The vial is labeled hydromorphone 4 mg/mL. How many milliliters should the nurse administer? A) 0.25 mL B) 0.5 mL C) 1 mL D) 2 mL 💫ANSWER✔️ ✔️ : B – 2 mg ÷ 4 mg/mL = 0.5 mL.
47. A child weighs 14 kg. The order is for IV fluids at 120 mL/kg/day. How many milliliters per hour should the nurse set the pump? A) 50 mL/hr B) 60 mL/hr C) 70 mL/hr D) 80 mL/hr 💫ANSWER✔️ ✔️ : C – 14 kg × 120 mL/kg/day = 1,680 mL/day. 1,680 ÷ 24 = 70 mL/hr.
48. A patient is to receive 1 L of D5W over 6 hours. The IV tubing has a drop factor of 15 gtt/mL. Calculate the drops per minute. A) 21 gtt/min B) 32 gtt/min C) 42 gtt/min D) 52 gtt/min 💫ANSWER✔️ ✔️ : C – 1 L = 1,000 mL. 1,000 mL ÷ 6 hours = 166.67 mL/hr. 166.67 ÷ 60 = 2. mL/min. 2.78 × 15 = 41.7 ≈ 42 gtt/min.
49. A patient is prescribed phenytoin 300 mg IV push. The vial is labeled phenytoin 50 mg/mL. How many milliliters should the nurse administer? A) 4 mL B) 5 mL C) 6 mL D) 7 mL 💫ANSWER✔️ ✔️ : C – 300 mg ÷ 50 mg/mL = 6 mL.
