Test Overview
Heparin-associated antibodies to PF4 detected by an ELISA technique.
Detection of heparin-dependent platelet antibodies.
0.000 - 0.399. Negative
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Test Details
The test is not run on holidays, but will be run the next business day instead.
3 hours
- Platelet Factor 4 Antibody
- PF4 Antibody
- Heparin Antibodies
- Heparin Associated Throbocytopenia and Thrombosis
- Heparin Associated Thrombosis
- Heparin Associated Thrombosis (HAT)
- Heparin Dependent Antiplatelet Antibodies
- Heparin Dependent Anti-Platelet Antibodies
- Heparin Induced Thrombosis (HIT)
- Heparin-Associated Thrombocytopenia and Thrombosis
- Platelet Antibody, Heparin Dependent
- HIT ELISA
- HEPARIN ANTIBODY ASSAY
- Heparin Associated Platelet Antibody
STAT testing is not available for this test. The decision to discontinue heparin therapy is a clinical one and should not be delayed due to a pending HIT antibody test or serotonin-release assay. Please see the clinical HIT guideline for details. https://pharmwebsp.med.umich.edu/_layouts/15/WopiFrame.aspx?sourcedoc=/…
Specimen Requirements
Collect specimen in a blue top (citrate 3.2%) tube. Mix by inversion. Specimen should arrive at lab within 3 hours of collection; transport at room temperature. Alternatively, centrifuge, aliquot plasma into a plastic tube, and freeze the specimen within 4 hours of collection. Transport frozen specimen on dry ice. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.
Additional Information
The heparin antibody assay is intended as a screening test and should not be relied upon solely to establish the diagnosis of heparin-induced thrombocytopenia.The decision to discontinue heparin therapy is a clinical one and should not be delayed due to a pending HIT antibody test or serotonin-release assay. Please see the clinical HIT guideline for details. https://pharmwebsp.med.umich.edu/_layouts/15/WopiFrame.aspx?sourcedoc=/…