*Plastic tubes are required because endogenous ACTH will bind to glass. Freezing of plasma sample and shipping on dry ice are required because endogenous ACTH will degrade if not frozen.
*If serum or whole blood-EDTA samples are received, they will not be processed. Test results from samples left on cells longer than 4 hours should be interpreted with caution. Exercise or other stress prior to blood sampling may increase ACTH values and should be avoided.
*Samples received in the lab after 4pm will be tested the next business day.