MyHealth

Manage your account, request prescriptions, set up appointments & more.

LOG IN
Don't have an account
Contact Us

* FACTOR VIII: C

Mnemonic

F VIII C

Synonym

Factor VIII Activity - Hemophilia A Factor - Factor VIII Coagulant Activity

Specimen Collection Requirements

Collect

Whole Blood light blue top tube (3.2% Buffered Sodium Citrate)

Handling

For detailed specimen collection and handling, see Coagulation Specimen Collection Guidelines.

If the patient is on medication, list the medications on the lab requisition. Patient should not have received blood products in the previous 2 weeks. Due to short stability, whole blood specimen tubes must reach the testing department within 4 hours, otherwise submit frozen plasma aliquots. If submitting whole blood, transport at ambient temperature (15-25°C) in original unopened tube. If submitting frozen plasma aliquots, specimens must remain frozen (-20°C) during transport.

STAT Requests: Available 7 days/week. Must notify Special Coagulation Department (503 413-5120) to make arrangements. Specimen must be received by 2 pm at Legacy Central Lab.

Preferred Volume

Two 2.7 mL whole blood or two 1.0 mL frozen plasma aliquots

Minimum Volume

One 2.7 mL whole blood or one 1.0 mL frozen plasma aliquot

Transport

Whole Blood: Ambient (15-25°C) Plasma: Frozen (-20°C), aliquots must remain frozen during storage and transport

Rejection Criteria

Whole Blood or Plasma, Refrigerated (2-8°C), clotted samples, samples collected in containers other than 3.2% Buffered Sodium Citrate, tubes filled less than 90%, samples from patients with a Hematocrit greater than 55%, hemolyzed samples due to ex-vivo causes (i.e., difficult draw, poor sample draw), whole blood samples that were frozen before processing

Stability

WHOLE BLOOD: Ambient: 4 hours PLASMA: Ambient: 4 hours; Frozen: -20°C 2 weeks, -70°C 6 months

Testing Information

Performed

Daily, Mon-Friday

Reported

1-3 days

Method

Clotting Assay

Reference Values

Reference Values

Varies, see report.

CPT Codes

85240

Last Updated: Thursday, January 5, 2017 03:41:03 AM


Client Services: 503-413-1234