Video Library
Nurs 4th Sem Mce A-fall 2025 Dosage Calculation (Montgomery College)
Total Questions : 25
Showing 10 questions, Sign in for moreA nurse is providing discharge teaching to the parent of a child who is prescribed diphenhydramine 25 mg elixir every 4 hr as needed. The amount available is diphenhydramine elixir 12.5 mg/5 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Rationale:
Desired dose = 25 mg
Available concentration = 12.5 mg per 5 mL
Step 1: Set up proportion:
12.5 mg : 5 mL = 25 mg : X mL
Step 2: Cross multiply:
12.5 × X = 25 × 5
12.5X = 125
X = 125 ÷ 12.5 = 10 mL
Final Answer: 10 mL
A nurse is caring for an adolescent client who has pneumonia and a prescription for cefpodoxime 5 mg/kg PO every 12 hr for 5 days. The client weighs 88 lb. How many mg should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Rationale:
Step 1: Convert weight from pounds to kilograms:
88 lb ÷ 2.2 = 40 kg
Step 2: Calculate dose per administration:
5 mg/kg × 40 kg = 200 mg
Final Answer: 200 mg
A nurse is calculating the intake of a client during the past 9 hr. The client's intake includes lactated Ringer's IV at 150 mL/hr, cefazolin 2g IV intermittent bolus in 100 mL of 0.9% sodium chloride, two units of packed RBCs of 275 mL and 250 mL: two IV bolus infusions of 250 mL of 0.9% sodium chloride, and famotidine 20 mg IV intermittent bolus in 50 mL of 0.9% sodium chloride. How many mL of intake should the nurse record?
Explanation
Rationale:
Lactated Ringer's IV = 150 mL/hr × 9 hr = 1350 mL
Cefazolin IV intermittent bolus = 100 mL
Packed RBCs = 275 mL + 250 mL = 525 mL
Two IV bolus infusions of 0.9% NaCl = 250 mL × 2 = 500 mL
Famotidine IV intermittent bolus = 50 mL
Total intake = 1350 + 100 + 525 + 500 + 50 = 2525 mL
Final Answer: 2525 mL
A nurse is preparing to administer vancomycin 1000 mg in 100 mL of DSW to infuse over 5 hours. The drop factor of the manual IV tubing is 15 gtt/mL. The nurse should adjust the manual IV infusion to deliver how many gtt/min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Rationale:
Total volume = 100 mL
Infusion time = 1.5 hr × 60 min/hr = 90 min
Drop factor = 15 gtt/mL
Step 1: Calculate mL/min:
100 mL ÷ 90 min = 1.111 mL/min
Step 2: Calculate gtt/min:
1.111 mL/min × 15 gtt/mL ≈ 16.7 gtt/min
Final Answer: 17 gtt/min
A nurse is preparing to administer Ringer's lactate by continuous IV infusion at 120 mL/hr. The drop factor of the manual IV tubing is 60 gtt/mL. The nurse should set the manual IV infusion to deliver how many gtt/min? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Rationale:
IV rate = 120 mL/hr
Drop factor = 60 gtt/mL
Step 1: Convert hours to minutes:
120 mL/hr ÷ 60 min/hr = 2 mL/min
Step 2: Calculate gtt/min:
2 mL/min × 60 gtt/mL = 120 gtt/min
Final Answer: 120 gtt/min
A client is receiving 500 mg of metronidazole IVPB q8h. The metronidazole has been placed in 100 mL DSW to infuse over 45 minutes. The administration set delivers 10 gtt/mL. At what rate in gtt/min should the IV infuse? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Rationale:
Total volume = 100 mL
Infusion time = 45 min
Drop factor = 10 gtt/mL
Step 1: Calculate mL/min:
100 mL ÷ 45 min ≈ 2.22 mL/min
Step 2: Calculate gtt/min:
2.22 mL/min × 10 gtt/mL ≈ 22.2 gtt/min ≈ 22 gtt/min
Final Answer: 22 gtt/min
A provider prescribes dextrose 5% in water IV to infuse at 100 mL/hr. The drop factor on the manual IV tubing is 60 gtt/mL. The nurse should set the IV flow rate to deliver how many gtt/min? (Round the answer to the nearest whole number.)
Explanation
Rationale:
IV rate = 100 mL/hr
Drop factor = 60 gtt/mL
Step 1: Convert hours to minutes:
100 mL/hr ÷ 60 min/hr = 1.667 mL/min
Step 2: Calculate gtt/min:
1.667 mL/min × 60 gtt/mL ≈ 100 gtt/min
Final Answer: 100 gtt/min
A client is to receive enoxaparin 30 mg subcutaneously. Available is enoxaparin 40 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Rationale:
Desired dose = 30 mg
Available concentration = 40 mg/mL
Step 1: Set up proportion:
40 mg : 1 mL = 30 mg : X mL
Step 2: Cross multiply:
40 × X = 30 × 1
40X = 30
X = 30 ÷ 40 = 0.75 ≈ 0.8 mL
Final Answer: 0.8 mL
A client weighing 50 kg is to receive a dobutamine infusion at 3 mcg/kg/min. The available medication is 250 mg of dobutamine in 500 mL DSW. How many ml/hr will the nurse program the pump? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Rationale:
Step 1: Calculate dose in mcg/min:
3 mcg/kg/min × 50 kg = 150 mcg/min
Step 2: Convert infusion solution to mcg/mL:
250 mg = 250,000 mcg in 500 mL → 250,000 ÷ 500 = 500 mcg/mL
Step 3: Calculate mL/min:
150 mcg/min ÷ 500 mcg/mL = 0.3 mL/min
Step 4: Convert to mL/hr:
0.3 mL/min × 60 min/hr = 18 mL/hr
Final Answer: 18 mL/hr
The nurse is preparing a heparin drip for a client who weighs 175 lb. The available heparin is infusion 20.000 units in 000 ml 0.9% sodium chloride. The order is to deliver a bolus then initiate a drip at 18 units/kg/hr. What will the nurse program the infusion pump to deliver? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Explanation
Rationale:
Step 1: Convert weight from pounds to kilograms:
175 lb ÷ 2.2 = 79.55 kg ≈ 79.5 kg
Step 2: Calculate the dose in units/hr:
18 units/kg/hr × 79.5 kg ≈ 1431 units/hr
Step 3: Determine the concentration of heparin:
20,000 units ÷ 1,000 mL = 20 units/mL
Step 4: Calculate mL/hr to deliver the ordered units:
1431 units/hr ÷ 20 units/mL ≈ 71.55 mL/hr ≈ 71.4 mL/hr
Final Answer: 71.4 mL/hr
Sign Up or Login to view all the 25 Questions on this Exam
Join over 100,000+ nursing students using Naxlex’s science-backend flashcards, practice tests and expert solutions to improve their grades and reach their goals.
Sign Up Now
