Posted Date
Effective Date
Update Type Test Code Change
CPT Code 82542
Order Code SRAU
Referral Laboratory Mayo Medical Laboratories



Serotonin Release Assay

Order Code:                  BCSRA

Fee Code:                     21614 (CPT 86022)

Reference Laboratory: Blood Center of Wisconsin


New Order Code:          SRAU

New Fee Code:             AB054 (CPT 82542)

New Reference Lab:      Mayo SRAU


Effective July 20, 2022, the Serotonin Release Assay (Unfractionated Heparin) is sent to Mayo Clinic Laboratories.


Collection Instructions: Send blue top (citrate 3.2%) or plasma aliquot for Heparin Antibody Assay (HITAB) screening test. Collect Serotonin Release Assay specimen in a red top tube from a fasting patient (preferred, but not required); do not use SST tube. Allow specimen to sit at room temperature for a minimum of 1 hour in order to clot completely. Centrifuge, aliquot 1 mL serum into a plastic vial and freeze (preferred) or refrigerate.


Reference Range: Negative.