Coagulation screen

Coagulation screen

A combination of screening laboratory tests, designed to provide rapid non-specific information, which allows an initial broad categorization of haemostatic problems.

The basic screen consists of:

  • platelet count
  • bleeding time for platelet function
  • PR (prothrombin ratio) for extrinsic pathway
  • aPTT (Activated Partial Thromboplastin time) for the intrinsic pathway
  • TCT or fibrinogen assay for final common pathway

Two other tests are regularly performed at the same time:

These tests may miss mild abnormalities but they will detect major disorders. The results of these screening tests, in conjunction with the clinical history (especially bleeding history), will then direct the selection of further, more detailed and specific coagulation tests, such as:


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