0030095
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Factor VIII, Activity

F8
Example Reports
High
Low
Normal

Ordering Recommendation

Use to diagnose hemophilia A or acquired factor VIII deficiency, or as part of a diagnostic workup for von Willebrand disease (VWD). May also be used to monitor treatment in individuals with factor VIII deficiency or VWD. Not recommended when screening for thrombophilia.

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation
Collect

Light blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.

Specimen Preparation

Transfer 2 mL platelet-poor plasma to an ARUP standard transport tube. (Min: 1 mL)

Storage/Transport Temperature

CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Unacceptable Conditions

Serum. EDTA plasma, clotted or hemolyzed specimens.

Remarks
Stability

Ambient: 4 hours; Refrigerated: Unacceptable; Frozen at -20° C: 3 months; Frozen at -70° C: 6 months

Methodology

Electromagnetic Mechanical Clot Detection

Performed

Mon-Sat

Reported

1-3 days

Reference Interval

Age Reference Interval
0-6 years 56-191%
7-9 years 76-199%
10-11 years 80-209%
12-13 years 72-198%
14-15 years 69-237%
16-17 years 63-221%
18 years and older 56-191%

Interpretive Data



Compliance Category

Standard

Note

Hotline History

N/A

CPT Codes

85240

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Components

Component Test Code* Component Chart Name LOINC
0030095 Factor VIII, Activity 3209-4
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • AHF
  • Antihemophilic Factor (AHF), Factor VIII:C (Coagulant Portion)
  • Factor VIII Activity Assay
  • Intrinsic Factor Proteins
  • Intrinsic Factors
Factor VIII, Activity