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Heparin Inhibition Test, Thromboelastography Panel — Whole Blood

Published: August 9, 2026Updated: August 16, 2026

A specialized whole-blood clot test used to evaluate the effect of heparin and overall blood clotting function.

Quick summary

["This test helps assess how heparin is affecting clot formation and may be used when bleeding or clotting problems are unexplained."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
52777-0
Short code
Heparin inhibition TEG Pnl Bld
Synonyms
Heparin inhibition TEG Pnl Bld
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This is a specialized thromboelastography, or TEG, test performed on whole blood. It evaluates clot formation, clot strength, and the influence of heparin on the blood's clotting response.

Why might I need this test?

A clinician may order it during surgery, critical illness, or evaluation of unexpected bleeding or clotting. It can help determine whether heparin exposure or another blood-clotting problem is contributing to the clinical situation.

How is the test performed?

A whole-blood sample is placed in a TEG instrument, which continuously records how the blood clots over time. The tracing is interpreted along with the patient's heparin exposure, medications, bleeding history, and other laboratory results.

How do I prepare for the test?

No special preparation is usually required when the test is ordered for an active bleeding problem or procedure. Do not stop or adjust heparin or other blood thinners on your own; follow your clinician's instructions because abrupt changes can be dangerous.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Results showing a strong heparin effect may indicate that heparin is still active, which can increase bleeding risk. Abnormal clot formation or strength may also point to low clotting factors, low platelets, liver-related clotting changes, or other causes that require clinical interpretation. This test alone does not confirm heparin-induced thrombocytopenia, a serious immune reaction to heparin.

Short name

Heparin Inhibition TEG

Frequently asked questions

Is this the same as a heparin-induced thrombocytopenia test?
No. A heparin inhibition TEG primarily evaluates how blood clots in relation to heparin effects. Diagnosis of heparin-induced thrombocytopenia usually requires a separate clinical evaluation and specific antibody or platelet-activation testing.
Does a TEG panel replace routine coagulation tests?
No. TEG provides information about the overall clotting process, while tests such as PT, INR, and aPTT assess specific parts of coagulation. Results are often interpreted together.
Why might the result be unexpected after surgery?
Recent heparin or other anticoagulant use, low platelets, blood loss, fluid replacement, and underlying clotting disorders can all affect the tracing. Your clinician will interpret the result in the context of your treatment and clinical condition.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy