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Test Directory -  Coagulation Screen


Coag, Clotting screen

Clinical Indications

.A group of tests used to assess bleeding risk and / or monitor bleeding conditions. Requested initially if an inherited coagulopathy is suspected clinically or from a family history. Internal haemorrhage not related to trauma, prolonged bleeding of any cause, recurrent haemorrhage e.g. bleeding gums or epistaxis, recurrent spontaneous bruising, haemorrhage into unusual places e.g. joints (with no explanation), or acutely unwell patients in whom disseminated intravascular coagulation (DIC) is suspected e.g. septicaemia

Test Includes

PT (INR), APTT, and Fibrinogen level

Request Form 

Combined Pathology Blood form (Yellow/Black or Blue for GP's)


On Request

Specific Criteria

  DO NOT use heparinised syringes / lines for collecting coagulation screens. Patient should be bled with minimal stasis, and samples received in lab within 2 hours of collection.

Turnaround Time

2 hours


 Citrated whole blood




  1 x Blue capped vacutainer tubes


  Samples must be received by lab within 2 hours of collection. Avoid prolonged stasis during venepuncture

Lab. Handling

Samples must be received within 2 hours of collection.

Causes for Rejection

Inadequately labelled, unlabelled, haemolysed, under-filled, clotted  or lipaemic samples.


  Activated sample, sample haemolysis or lipaemia..

Reference Range

  INR: 0.8 to 1.2
APTTR: 0.8 to 1.2
Fibrinogen: 2.0 to 4.5 g/L.


See patient test report

Version 1.0 / January 2013