One 7.5 mL serum separator tube (SST) for each specimen. Also acceptable: One 5 mL red top tube. Fasting morning specimen is recommended. Capillary specimen should be obtained with Terumo T-MG Capiject tubes and separated immediately. Label each with date and time drawn. Frozen specimen preferred, but refrigerated specimen is acceptable if testing can be assayed within 8 hours. If multiple tests are ordered, send a separate specimen for this test.
Allow to clot, centrifuge and separate serum from cells immediately. Freeze. Allow no more than one freeze/thaw cycle.
8 hours refrigerated at 2-8° C or 2 months frozen at -20° C