NMC CBT NMC-CBT Drug Calculations and Numeracy 5

Question 1

An infusion pump alarm shows an occlusion after delivering 180 mL of a 500 mL bag. What percentage of the infusion has been delivered?

Accepted Answer

36%

Answer

(180 ÷ 500) × 100 = 36%.

Question 2

Codeine phosphate 30 mg/5 mL oral solution is prescribed at 60 mg four times daily. How many mL per day will the patient require?

Accepted Answer

40 mL

Answer

60 mg dose = 10 mL; 10 × 4 = 40 mL per day.

Question 3

A patient is to receive 20 mmol of potassium in 100 mL over 1 hour. The giving set delivers 20 drops/mL. What is the drip rate in drops/min?

Accepted Answer

33 drops/min

Answer

(100 × 20) ÷ 60 = 2000 ÷ 60 ≈ 33 drops/min.

Question 4

A nurse is checking a drug with a concentration of 2 mg in 1 mL. She needs to give 0.75 mg. How many mL should she draw up?

Accepted Answer

0.375 mL

Answer

0.75 ÷ 2 = 0.375 mL.

Question 5

A neonate weighing 3.2 kg is prescribed caffeine citrate 20 mg/kg as a loading dose. The solution is 10 mg/mL. How many mL are required?

Accepted Answer

6.4 mL

Answer

Dose = 20 × 3.2 = 64 mg; volume = 64 ÷ 10 = 6.4 mL.

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