NMC CBT - Nursing and Midwifery Council Computer-Based Test Drug Calculations and Numeracy 1

Question 1

A patient is prescribed 750 micrograms (mcg) of digoxin orally. The available tablets contain 250 mcg each. How many tablets should be administered?

Accepted Answer

3 tablets

Answer

Using the formula: dose required ÷ dose available = 750 mcg ÷ 250 mcg = 3 tablets.

Question 2

500 mL of 5% dextrose is prescribed over 4 hours. The giving set delivers 15 drops per mL. What is the correct drip rate in drops per minute?

Accepted Answer

31 drops/min

Answer

Drip rate = (volume in mL × drop factor) ÷ (time in hours × 60) = (500 × 15) ÷ (4 × 60) = 7500 ÷ 240 = 31.25, rounded to 31 drops/min.

Question 3

A child weighing 30 kg is prescribed ibuprofen at 10 mg/kg. The suspension available is 100 mg in 5 mL. What volume should be given?

Accepted Answer

15 mL

Answer

Required dose = 30 kg × 10 mg/kg = 300 mg. Volume = (300 ÷ 100) × 5 = 15 mL.

Question 4

A patient requires a morphine infusion at 2 mg/hour. The available bag contains 50 mg of morphine in 50 mL of 0.9% NaCl. What infusion rate in mL/hr should be set on the pump?

Accepted Answer

2 mL/hr

Answer

Concentration = 50 mg ÷ 50 mL = 1 mg/mL. Infusion rate = 2 mg/hr ÷ 1 mg/mL = 2 mL/hr.

Question 5

A vial contains 1 g of amoxicillin powder. After reconstitution with 10 mL of water for injection, a patient requires 250 mg IV. What volume should be drawn up?

Accepted Answer

2.5 mL

Answer

Post-reconstitution concentration = 1000 mg ÷ 10 mL = 100 mg/mL. Volume = 250 mg ÷ 100 mg/mL = 2.5 mL.

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

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

NMC CBT - Nursing and Midwifery Council Computer-Based Test Drug Calculations and Numeracy 1