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Medical Definition of Metabisulfite test
1. A test for sickle cell haemoglobin (Hb S); deoxygenation of cells containing Hb S is enhanced by addition of sodium metabisulfite to the blood, causing sickling visible on a slide; certain other abnormal haemoglobins (Hb CHarlem and Hb I) also sickle in this test. (05 Mar 2000)