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Room Temperature, 3 Days; 2-8 °C, 7 days
Allow to clot for 30 mins, centrifuge within 2 hours
An ALT test measures the level of this enzyme, alanine aminotransferase, in your blood. ALT is one of several enzymes that help the liver function properly. Although small amounts of ALT can be found in other parts of the body, it is predominantly found in the liver.