Soluble Transferrin Receptor (Change effective as of 10/20/25: Refer to 3020070 in the October Hotline)

1 mL (min 0.3 mL)

0.3 mL

Serum separator tube or plasma separator tube; also acceptable: green (lithium heparin)

Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube

Refrigerated

Contaminated, severely hemolyzed, icteric, or lipemic specimens