CPT Code


Specimen Type


Container Type

Serum Separator Tube (SST)/Yellow


Room Temperature, 4 day; 2-8 °C, 7 days; -20°C, 12 weeks

Handling Instructions

Allow to clot for 30 mins, centrifuge within 2 hours

Clinical Notes

An AST test measures the level of aspartate aminotransferase in your blood. AST is an enzyme that is normally present in the liver, heart, brain, pancreas, kidneys, and many other muscles and tissues in the body. Enzymes like AST help facilitate fundamental biological processes in these organs and tissues.

Performing Lab

Principle Laboratory - Dallas
6210 N Belt Line Rd
Irving, TX 75063

Principle Laboratory - Houston
16840 Buccaneer Ln
Suite 281
Houston, TX 77058