Factor VIII inhibitor screen

Test/Investigation

Factor VIII inhibitor screen

Site(s) or Laboratory offering Test/Investigation

NNUH

Also Known as/Frequency of Test

Inhibitor screen

Indications

Investigation of persistently prolonged APTT

Comments/Precautions

Needs prior coagulation screen Please discuss with duty haematology consultant before requesting the test and with results for interpretation and management plan, as approapriate. If the inhibitor screen is positive, the sample may have to be sent away to referral laboratory for quantification assay

Ideal sample age for accurate results/Maximum acceptable sample age (at the time of analysis)

4 hours; Max 8 hours

Sample type

Citrate x 3

Turnaround times (TAT) Urgent/Routine/GP or OPD

3 hours/1 week