PTD - 17

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Test Directory -  Factor X Assay


Factor 10, F10

Clinical Indications

Haemorrhage from umbilical cord. Unexplained or excessive bruising.
Please note that a Factor X assay is not to be confused with an Anti Xa assay (Low Molecular Weight Heparin Assay)

Request Form

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


Available routinely, samples analysed within  two weeks of receipt, unless required urgently Please discuss with Consultant Haematologist before requesting.

Specific Criteria

Patient should be bled with minimal stasis, and samples received in lab within 4 hours of collection. All requests are reviewed by Consultant Haematologist before testing.

Turnaround Time

Analysed within two weeks of receipt. Contact laboratory if urgent (Ext:1241)


Citrated Blood




3 Blue capped vacutainer tubes

Lab. Handling

Samples double spun and frozen.

Causes for Rejection

Mislabelled / unlabelled samples. Underfilled, clotted or haemolysed samples. Patient on anticoagulant therapy. Failure to meet specified criteria.


  Anticoagulation, poor phlebotomy practice (activated clotting pathway)

Reference Range

50 150%



Version 1.0 / January 2013