Quick answer
The OET tests English proficiency across 12 healthcare professions: medicine, nursing, dentistry, dietetics, occupational therapy, optometry, pharmacy, physiotherapy, podiatry, radiography, speech pathology, and veterinary science. The Writing sub-test format is identical across all 12 — a 250-word professional letter marked against six criteria — but case notes and expected letter types differ by profession. Grade B (350) in all four sub-tests is accepted by these regulators; the NMC and AHPRA accept Grade C+ (300) in Writing with Grade B in Listening, Reading and Speaking.