skip to main content

Lithium monitoring — GPhC CRA MCQ

Instant feedback + full explanation. One question, done properly.

HardCNS TherapeuticsLithium monitoringGPhC CRA

A 47-year-old patient taking lithium carbonate MR is stable for bipolar disorder. They ask what blood tests are needed because their GP requested monitoring. They also take levothyroxine. What monitoring is required?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: A — Lithium level, renal function, thyroid function and calcium

Lithium requires regular serum level monitoring because it has a narrow therapeutic index. Renal, thyroid and calcium monitoring are also needed because lithium can affect these systems. The other test panels do not address routine lithium safety.

Reference: BNF; NICE CKS