Preferred Sample Type

Factor Assay

Factor Assay

Specimen Volume

2 x 3.5mL

Specimen Transport

Standard transport to laboratory - State for the attention of Special Coagulation on request form

Sample Preparation

Samples for any coagulation tests must be filled to the black fill line indicated on the sample tube. Any sample filled above or below this level will be rejected and a repeat sample will be required

Turnaround Time

21 days

Sample Processing In Laboratory

Sample should be centrifuged

Sample Stability

12 hours from venepuncture (ideally received no later than 4 hours after collection)

General Information

Note: For external requests please click Here for Coagulation Disorders request form. Please complete all information fully

Samples that meet the following criteria will not be processed:

  • Haemolysed, clotted, underfilled or overfilled samples.
  • Samples >12 hours old from the time of collection.
  • Samples received from other hospital laboratories that have been frozen and thawed.
  • Samples which fail the minimum data set.

Assay limitations:

  • PT based assays: (Factors II, V, VII and X) not affected by heparin up to 1 U/ml, haemoglobin up to 500 mg/dl, triglycerides up to 1000 mg/dl or bilirubin up to 30 mg/dl.
  • APTT based assays: (Factors VIII, IX, XI and XII) not affected haemoglobin up to 500 mg/dl, triglycerides up to 1000 mg/dl or bilirubin up to 26 mg/dl.
  • Chromogenic Factor VIII assay: not affected by heparin up to 1 U/ml.

Reference Range

FII (Factor 2) 87-129 u/dL

FV (Factor 5) 66-135 u/dL

FVII (Factor 7) 66-170 u/dL

FVIII (Factor 8) 57-158 u/dL

FIX (Factor 9) 82-166 u/dL

FX (Factor 10) 76-171 u/dL

FXI (Factor 11) 70-164 u/dL

FXII (Factor 12) 64-183 u/dL

Bovine Chromogenic FVIII (Factor 8) 0.67-1.44 IU/ml

Specifications

  • EQA Status: NEQAS
  • EQAS Scheme: Yes

General Information

General information about the website and its content

Location of Laboratories

Where the laboratories are located and information about the services offered at each laboratory