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What Is a Rotational Thromboelastometry Machine?

A rotational thromboelastometry machine is a blood testing device that measures how a clot forms, strengthens, and breaks down over time. The test is commonly known as ROTEM. It uses a small whole-blood sample and measures the viscoelastic properties of clotting. Results can help clinicians understand bleeding or clotting problems during surgery, trauma, liver disease, obstetric emergencies, and critical care.

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What Is a Rotational Thromboelastometry Machine?

A rotational thromboelastometry machine is a blood testing device that measures how a clot forms, strengthens, and breaks down over time. The test is commonly known as ROTEM. It uses a small whole-blood sample and measures the viscoelastic properties of clotting. Results can help clinicians understand bleeding or clotting problems during surgery, trauma, liver disease, obstetric emergencies, and critical care.

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What Is a Rotational Thromboelastometry Machine Used For?

A rotational thromboelastometry machine is used to guide blood product and coagulation treatment decisions in selected patients. It can help assess clotting time, clot strength, fibrinogen contribution, platelet contribution, and fibrinolysis. Clinicians may use it during major bleeding, cardiac surgery, trauma resuscitation, liver transplant, or intensive care. It gives functional clot information faster than some conventional laboratory tests, but it does not replace the full clinical picture.

How a ROTEM Machine Works

A blood sample is placed into a small cup with reagents that start or evaluate clotting pathways. A pin or measuring system detects changes as the clot forms between the cup and pin. The machine creates a graph and numeric values that show clot initiation, clot development, clot firmness, and clot breakdown. Different test channels can evaluate different parts of coagulation.

How Is ROTEM Testing Done?

A trained operator collects a blood sample and loads it into the ROTEM system according to the test protocol. The machine runs one or more assays and displays results as the clot develops. Clinicians review the values with bleeding status, medications, temperature, calcium, blood count, and standard lab tests. Treatment may include plasma, platelets, fibrinogen, cryoprecipitate, antifibrinolytics, or other therapies depending on the result and protocol.

Limitations and Quality Control

ROTEM results can be affected by sample handling, anticoagulants, low temperature, low calcium, hemodilution, medications, and operator technique. The test does not measure every part of hemostasis and may not detect all platelet drug effects or vascular causes of bleeding. Quality control and trained interpretation are needed. Results should be used with clinical assessment rather than as the only basis for transfusion decisions.

FAQs About Rotational Thromboelastometry Machines

Is ROTEM the same as TEG?

They are related viscoelastic clotting tests, but they use different devices and measurement methods. Both assess clot formation and breakdown in whole blood.

How fast are ROTEM results available?

Some useful results appear within minutes, while full clot development and lysis information can take longer.

Does ROTEM replace PT and aPTT testing?

No. ROTEM gives functional clot information, while PT, aPTT, platelet count, fibrinogen, and other labs still provide important data.

Who uses a ROTEM machine?

It is used by trained laboratory, anesthesia, trauma, surgery, obstetric, or critical care teams depending on the facility.

References

Basic Principles of Rotational Thromboelastometry (ROTEM). PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC10606358/. Date Accessed June 16, 2026.

Thromboelastography and Rotational Thromboelastometry for the Surgical Intensivist. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC6433488/. Date Accessed June 16, 2026.

Laboratory Evaluation of Coagulopathies. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK606118/. Date Accessed June 16, 2026.

510(k) Summary: ROTEM Sigma Thromboelastometry System. U.S. Food and Drug Administration. https://www.accessdata.fda.gov/cdrh_docs/reviews/K201440.pdf. Date Accessed June 16, 2026.

The Role of TEG and ROTEM in Damage Control Resuscitation. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC8601668/. Date Accessed June 16, 2026.