Factor Assays

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)

N/A

Specimen Container - Adult

• Light Blue Top BD;

Specimen Container - Paediatric

• N/A;

Analytes

• N/A;

Part of a test profile?

No

Volume (min) of sample to be sent to laboratory

4ml

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

N/A

UKAS number

8869

UKAS accredited test?

Yes

Comments

N/A

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