Factor Assays VIII, IX, XI and XII

Pathology category

Haematology

Code

Referral code

Request form

Standard

Test information

Factors VIII, IX, XI and XIIPLEASE NOTE: THESE TESTS ARE NOT CURRENTLY ACCREDITED UNDER ISO 15189Note that paediatric samples (<18 y/o) will be referred to Special Coagulation DepartmentClinical Laboratory ServicesQE Hospital BirminghamMindelsohn WayBirminghamB15 2WB0121 371 5988

Guidelines

Pre-analytical

Discuss urgency of request with laboratory.A full specimen container is required for accurate testing. Lipaemic samples may cause problems with testing.Sample transport should be at 4-25C and reach the laboratory ASAPPlease note: the samples must arrive the same day as collection otherwise they will be rejected by the laboratory

Reference range

50-150 %Some clinically normal individuals have a Factor VIIIC of 35-50%.Values below 30% are unequivocally abnormal.

Tube type

Tube type info

2.7ml Blue top citrate

Special requirements

Usually in discussion with lab.

Minimum volume

1 tube per factor minimum 90% full – essential to ensure 1:9 ratio of anticoagulant:blood

Assay frequency

As required – non routine

TAT Inpatient (urgent)

Discuss with lab

TAT Inpatient

Discuss with lab

TAT GP/Outpatient

Discuss with lab

Referral lab

local