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Test Code LAB2075 Inhibitor Assay - Factor VIII only

Additional Codes:

INH

Includes:

Factor VIII activity

Notes:

Specify the inhibitor to be determined on the requisition. Must have a factor activity level performed before in Inhibitor assay can be performed. If the Factor VIII level is normal, inhibitor testing will be cancelled.

Call Lab Client Services at 792-0707 to notify lab of specimen arrival.

  • If the patient's hematocrit is <20% or >55%, call Lab Client Services at 792-0707 to obtain an anticoagulant adjusted tube.
  • Specimen should not be drawn from a heparinized line.
  • Do not use the first tube/syringe for hemostasis samples.  The first tube may contain tissue factor which will cause activation of coagulation.
  • The venipuncture must not be traumatic or slow flowing.
  • Avoid leaving the tourniquet on for an extended time.

Reasons for rejection:
1. If the venipuncture tube is not filled to the indicated line
2. If the specimen is grossly hemolyzed or clotted.

Collection:

Specimen: Blood

Container: Blue Top Tube with 3.2% (0.109 M) buffered Sodium Citrate anticoagulant only

Volume: 2.7 mL. Tube must be filled to indicated line.

Storage Instructions:

Centrifuge and freeze platelet poor plasma within 2 hours of collection.

Turnaround Time (TAT):

Batched once per week – day varies. May be requested STAT but requires the approval of the Pathologist

Test Availability:

Monday – Friday 7:30am - 5:00pm

Assay:

1.0 ml plasma

Request Form:

Routine Laboratory Request Form

Send To:

UMC MAIN LABORATORY Specimen Receiving – EH319 Children’s Hospital

Reference Interval:

Negative (<1.0 Bethesda Unit)

Interpretive Data:

Assay reviewed by pathologist