Test Overview
Test Methodology

CoaguChek- clotting (recombinant thromboplastin)

Test Usage

Performed at authorized locations by point of care operators. Prothrombin time and INR are monitored in the point of care for patients taking oral anticoagulants, which allow physicians to adjust medications levels to the prescribed therapeutic or target range.

Reference Range *

Reference ranges are available in the Coaguchek XS System test procedure located on the POC website: https://www.pathology.med.umich.edu/point-of-care

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

•When a patient is on IV therapy, do not collect the blood sample from the same arm receiving the infusion line.
•Results are unaffected by heparin concentrations up to 0.8 U/mL
•Testing is insensitive to low molecular weight heparin (LMWH) up to 2 IU anti-factor Xa activity/mL
•The presence of anti-phospholipid antibodies (APAs) can potentially lead to prolonged clotting times i.e. elevated INR values.
•Samples of patients treated with protamine sulfate cannot be tested with this system.
•The results obtained cannot be used for the determination or the assessment of a therapy with factor II or factor X antagonists.

Test Details
Analytic Time

Dependent on patient's coagulation status, results are obtained in less than 2 minutes.

Soft Order Code
MiChart Code
Protime-INR, Point of Care
Point of Care
Point of Care
Specimen Requirements
Collection Instructions

Fingerstick: Use first drop, avoid excessive squeezing or milking.

Normal Volume
10 µL
Minimum Volume
10 µL
Rejection Criteria
Plasma or serum cannot be used for testing; only fresh capillary or non-anticoagulated venous whole blood is acceptable.
CPT Code