NMC CBT NMC-CBT Drug Calculations and Numeracy 3

Question 1

A patient requires dopamine at 5 mcg/kg/min. The patient weighs 70 kg. Dopamine 400 mg is in 250 mL of dextrose. What is the infusion rate in mL/hr?

Accepted Answer

13.1 mL/hr

Answer

Dose = 5 × 70 = 350 mcg/min; concentration = 400,000 mcg ÷ 250 mL = 1600 mcg/mL; rate = 350 ÷ 1600 × 60 ≈ 13.1 mL/hr.

Question 2

A patient receives 1 litre of Hartmann's solution over 8 hours via a burette (60 drops/mL). What is the drip rate?

Accepted Answer

125 drops/min

Answer

(1000 × 60) ÷ (8 × 60) = 60,000 ÷ 480 = 125 drops/min.

Question 3

Warfarin 3.5 mg is prescribed. Tablets come in 0.5 mg and 5 mg strengths. What is the most appropriate combination?

Accepted Answer

Seven 0.5 mg tablets

Answer

3.5 mg ÷ 0.5 mg = 7 tablets of 0.5 mg is the safest single-strength approach.

Question 4

A patient is prescribed gentamicin 5 mg/kg as a single daily dose. The patient weighs 85 kg. Available is gentamicin 80 mg/2 mL. How many mL are required?

Accepted Answer

10.6 mL

Answer

Dose = 5 × 85 = 425 mg; concentration = 40 mg/mL; volume = 425 ÷ 40 = 10.625 ≈ 10.6 mL.

Question 5

Convert 0.05 grams to micrograms.

Accepted Answer

50,000 mcg

Answer

0.05 g × 1,000 = 50 mg × 1,000 = 50,000 mcg.

(NMC CBT) Nursing and Midwifery Council Computer-Based Test Practice Test

(NMC CBT) Nursing and Midwifery Council Computer-Based Test Practice Test

NMC CBT NMC-CBT Drug Calculations and Numeracy 3