Heaf test

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Heaf test (heef) n. a skin test, no longer available, to determine whether or not an individual is immune to tuberculosis, carried out before vaccination. A spring-loaded gun mounted with very short needles produces a circle of six punctures in the forearm through which tuberculin is introduced. If the test is positive a reaction causes the skin to become red and raised, indicating that the individual is immune. [ F. R. G. Heaf (1895–1973), British physician]