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Lab Test Dictionary

Factor VIII Activity, Chromogenic (16049)

Methodology

Chromogenic Assay


Synonyms

Factor 8

Specimen Type

Plasma

Performing Lab

Quest Diagnostics San Juan Capistrano


Epic ID

Other Reference Test

Lab Test Days

Wednesday and Saturday

Standard TAT

1-5 Days


Collection Information

Specimen Required

(one) 1.8 mL or (one) 2.7 mL Blood

Container Type

Light Blue (Sodium Citrate)

Collection Instructions

Note: Storage of whole blood at refrigerated temperatures prior to processing may lead to cryoprecipitate formation and falsely low Factor VIII.


Processing Information - Lab Use Only

Transport Temperature

Frozen-Only

Specimen Stability

Room Temp: 8 Hours; Refrigerated: 8 Hours; Frozen: 21 Days

Rejection Criteria

Received room temp; Received refrigerated

Test Volume Required

1 mL Platelet-Poor Plasma

Minimum Test Volume

0.5 mL Platelet-Poor Plasma

Processing Instructions

Platelet Poor Plasma: Centrifuge light blue-top tube 15 minutes at approx. 1500 g within 60 minutes of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer and place into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial. Plasma must be free of platelets (<10,000/mcl). Freeze immediately and send frozen.


CPT Codes

85240


Revised

12-01-19

Initials

SL