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Factor Assays

Alias: Factor V, VII, VIII, IX, X, XI, XII, XIII

Discipline: Coagulation

Test information: Factor assays are commonly undertaken when there is prolongation of the APTT or PT suggesting a deficiency of one or more clotting proteins.
D Dimer is a specific breakdown product of fibrin.
Levels are raised in DIC, whilst a negative D-Dimer determined on patients with a suspected thrombotic disorder (DVT/PE) has a high negative predictive value.

Specimen Type(s)
  • Blood;
Other Acceptable Specimen Type(s)
Specimen Container - Adult
  • Light Blue Top BD;
Specimen Container - Paediatric
  • N/A;
  • N/A;
Part of a test profile?
Volume (min) of sample to be sent to laboratory
Patient Preparation, Sample Handling and Transport
Coagulation samples are volume critical, if a patient is difficult to bleed paediatric tubes (1.3ml) are available on request.
Some patients with a grossly raised Haematocrit (HCT) >0.57 may give erroneous coagulation test results - individual patient adjusted volume coagulation tubes are available on request from the laboratory.
Please make a note of any anticoagulants and/or bleeding/bruising symptoms.
Maximum add on time
4 hours
Units and Reference Ranges / Interpretation
UKAS number
UKAS accredited test?

If you have any queries about a test or results interpretation please contact us.

Last updated: 09-05-2024