Factor Assays For Clotting Factors

Blood Sciences Test Blood Transfusion

---

Specimen

Sodium citrate

Minimum sample volume

3 x 1.8 ml or exceptionally, 1.3 mL tube but see below

Special Instructions

We require 3 x coag tubes if possible, for investigation of a new patient. Please contact the Coagulation Lab on 01392 402916 to discuss if unable to provide sufficient plasma. As with all coagulation tests these must be correctly filled from a clean venepuncture.

Factors affecting results

Haemolysed or clotted samples will be rejected. Samples should be received no later than 2 hours after collection as some Factors are labile. If unable to comply, suggest sending patient to our Phlebotomists.

Reference Ranges

Reference ranges Adult >18 years of age

• FII : 50 – 150 iu/dl
• FV : 50 – 150 iu/dl
• FVII : 50 – 150 iu/dl
• FVIIIc : 50 – 150 iu/dl
• FIXc : 50 – 150 iu/dl
• FX : 50 – 150 iu/dl
• FXI : 70 – 140 iu/dl
• FXII : 50 – 150 iu/dl
• FXIII: Normal / Absent
• vWF : Activity 50 – 150 iu/dl
• vWF : Antigen 45 – 160 iu/dl
• From : Williams M, Chalmers E,Gibson B  British Journal of Haematology 2002 119: 295 – 309,Andrew M et al Blood 1992 80: 1998 – 2005

Test Usage

Detection of deficiency/inhibitors or monitoring of therapy

Availability

In house

Turnaround time

14 days

Clinical Advice

Clinical advice is available from the Haematology Medical team (contact RD&E switchboard on 01392 411611)

Specimen Labelling Procedure