Sign in →

Test Code SRA2 Serotonin Release Assay (SRA), Unfractionated Heparin

Specimen Required

1 mL frozen serum

Specimen Minimum Volume

0.4 mL

Specimen Stability

Room temperature: 24 hours Refrigerated: 48 hours Frozen: 6 months

Rejection Due To

Received room temperature • Received refrigerated

Day(s) and Time(s) Performed

Set up: Sun-Fri a.m.; Report available: 1 day

Method Name

Radiobinding 14C Serotonin Radiolabel

Collection Container / Tube

Other Acceptable Container:

Transport Container

Plastic screw-cap vial

Transport / Storage Conditions


Reference Values

See Laboratory Report

CPT Codes


Clinical Reference

Any patient with an unexplained fall in the platelet count of >40% during or after cessation of heparin therapy should be suspected of heparin-induced thrombocytopenia (HIT).