Specimen Type/Volume

1 mL serum.

Shipping Information

Ship in insulated container with freezer packs.

Collection Protocol

Do not use SST blood collection tubes. Collect blood into a red-top vacutainer; avoid hemolysis. Separate serum from cells as soon as possible following collection and transfer to a leakproof tube. Refrigerate until shipped.

Additional Information

Test is batch-tested once per week. Free T4 by equilibrium dialysis run weekly. See Clinical Pathology section-hyperthyroidism * [5]& hypothyroidism * [6] of the User's Guide.