Preferred Sample Type

Factor Assays (Coagulation)
2x 2.7mL

Sample Processing in Laboratory

To arrive in laboratory within 4 hours of collection

Sample Preparation

Samples for any coagulation tests must be filled to within a tolerance of 10% of the fill line indicated on the sample tube. Any sample filled above or below this level will be reported as overfilled or insufficient and a repeat sample will be required

Turnaround Time

21 days

Sample Stability

8 hours

Factor Assays (Coagulation)


Factor assays for V, VII, VIII, IX, X, XI and XII  are performed. 

Please note Factor II and Factor XIII can be requested but are referred to Queen Elizabeth Hospital Birmingham for testing.

If inhibitors are suspected these samples will also be referred to QEHB.

If Factor VIII or Factor IX levels fall within reference limits and a mild haemophilia is still clinically suspected, please contact Haematology for advice

Please discuss with a Haematologist before making a request for Factor Assays.

Reference Range

FV            65.9 – 135.1%

FVII          65.7 – 170.3%

FVIII         56.8 – 157.6%

FIX           81.5 – 166.3%

FX            75.6 – 170.6%

FXI           69.5 – 163.9%

FXII          63.8 – 182.6%


  • EQA Scheme?: Yes
  • EQA Status: NEQAS

The laboratories at Heartlands Hospital, Good Hope Hospital and Solihull Hospital form part of the services provided by University Hospitals Birmingham and are UKAS (United Kingdom Accreditation Service) accredited to the ISO 15189:2012 standard. For a list of accredited tests and other information please visit the UKAS website using the following link:

  • Heartlands, Good Hope and Solihull Hospital pathology laboratories are a UKAS accredited medical laboratory No.8217
  • United Kingdom Health Security Agency laboratory is a UKAS accredited medical laboratory No.8213

Tests not appearing on the UKAS Schedule of Accreditation currently remain outside of our scope of accreditation. However, these tests have been validated to the same high standard as accredited tests and are performed by the same trained and competent staff.

For further test information, please visit the test database:

Protection of personal information - Laboratory Medicine comply with the Trust Data Protection policy and have procedures in place to allow the Directorate and its employees to comply with the Data Protection act  1998 and associated best practice and guidance.

For further information contact Louise Fallon, Quality Manager, 0121 424 1235