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Test ID FSRAU Serotonin Release Assay, Unfractionated Heparin

Method Name

Radiobinding 14C Serotonin Radiolabel

Reporting Name

SRA, Unfractioned Heparin

Specimen Type


Specimen Required

Collection Container/Tube:

Preferred: Red Top

Acceptable: Serum gel

Specimen Volume: 1 mL


Collection Instructions:

Draw blood in a plain red top tube(s), serum gel tube(s) is acceptable. Spin down and send 1 mL of serum frozen in a plastic vial.

Specimen Minimum Volume

0.4 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen 180 days

Reference Values

UFH SRA Result                        Negative

UFH Low Dose, 0.1 IU/mL          % release

UFH Low Dose, 0.5 IU/mL          % release

UFH High Dose, 100 IU/mL        % release


A sample is considered negative if there is: <20% release.


Day(s) Performed

Sunday through Thursday

Performing Laboratory

Quest Diagnostics Nichols Institute

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FSRAU SRA, Unfractioned Heparin Not Provided


Result ID Test Result Name Result LOINC Value
Z3630 UFH SRA Result 50733-5
Z3631 UFH Low Dose, 0.1 IU/mL 50728-5
Z3632 UFH Low Dose, 0.5 IU/mL 74005-0
Z3633 UFH High Dose, 100 IU/mL 50727-7

Test Classification

This test was developed and its performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Report Available

2 to 8 days

NY State Approved