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Test ID FHEP2 Heparin Cofactor II

Specimen Required

Patient Preparation: Do not draw from an arm with a heparin lock or heparinized catheter.

Specimen Type: Citrated plasma

Collection Container/Tube: Light-blue top (citrate)

Specimen Volume: 2 mL

Collection Instructions: Draw blood in a light blue-top (Sodium citrate) tube(s). Spin down and send 2 mL citrated plasma frozen in a plastic vial.


Note: Separate specimens must be submitted when multiple tests are ordered.

Useful For

Assessment of thrombotic risk associated with heparin cofactor II levels.

Method Name


Reporting Name

Heparin Cofactor II

Specimen Type

Plasma Na Cit

Specimen Minimum Volume

1 mL (Note: This volume does not allow for repeat testing.)

Specimen Stability Information

Specimen Type Temperature Time Special Container
Plasma Na Cit Frozen 180 days

Reference Values


In healthy adults, heparin cofactor II reference range in plasma is 65% to 145%. Plasma levels of heparin cofactor II are approximately 50% of adult levels at birth and reach adult levels at six months of age.

Performing Laboratory

Esoterix Coagulation

Test Classification

Results of this test are for research purposes only per the assay manufacturer. The performance characteristics of this assay have not been established. The result should not be used as a diagnostic procedure without confirmation of the diagnosis by another medically established diagnostic product or procedure.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FHEP2 Heparin Cofactor II 33987-9


Result ID Test Result Name Result LOINC Value
FHEP2 Heparin Cofactor II 33987-9