Normal Phosphate 0.8-1.4 mmol/L — FRCA Primary MCQ
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Correct answer: B — 0.8–1.4 mmol/L, the usual adult plasma phosphate range
The best answer is “0.8–1.4 mmol/L, the usual adult plasma phosphate range”. Normal adult plasma phosphate is approximately 0.8–1.4 mmol/L. It is important for ATP generation, membrane phospholipids, bone mineralisation and 2,3-BPG formation. Hypophosphataemia can cause weakness, respiratory failure and myocardial dysfunction, particularly during refeeding or critical illness; interpretation should include renal function and acid–base state.
Reference: Royal College of Anaesthetists, Primary FRCA Syllabus 2021: https://www.rcoa.ac.uk/sites/default/files/documents/2026-01/Primary-FRCA-Syllabus.pdf