Search our extensive Laboratory Test Directory to find test codes, ordering recommendations, specimen stability information, Test Fact Sheets, and more.
Recommendations when to order or not order the test. May include related or preferred tests.
Order to diagnose factor VIII deficiency, detect factor VIII inhibitors, and monitor factor VIII replacement therapy.
New York DOH Approval Status
Indicates whether a test has been approved by the New York State Department of Health.
This test is New York state approved.
Specimen Required
Patient PreparationInstructions patient must follow before/during specimen collection.
CollectSpecimen type to collect. May include collection media, tubes, kits, etc.
Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.
Specimen PreparationInstructions for specimen prep before/after collection and prior to transport.
Transfer two 3 mL aliquots of platelet-poor plasma to ARUP Standard Transport Tubes. (Min: 2 mL/each)
Storage/Transport TemperaturePreferred temperatures for storage prior to and during shipping to ARUP. See Stability for additional info.
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Unacceptable ConditionsCommon conditions under which a specimen will be rejected.
Serum. EDTA plasma, clotted or hemolyzed specimens.
RemarksAdditional specimen collection, transport, or test submission information.
StabilityAcceptable times/temperatures for specimens. Times include storage and transport time to ARUP.
Ambient: 4 hours; Refrigerated: Unacceptable; Frozen at -20°C: 3 months; Frozen at -70°C: 6 months
Methodology
Process(es) used to perform the test.
Electromagnetic Mechanical Clot Detection
Performed
Days of the week the test is performed.
Mon-Sat
Reported
Expected turnaround time for a result, beginning when ARUP has received the specimen.
1-3 days
Reference Interval
Normal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Test Number
Components
Reference Interval
Bethesda Quantitative, F8
0.5 BU or less
Factor VIII, Activity
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
May include disease information, patient result explanation, recommendations, or details of testing.
Compliance Category
Standard
Note
Additional information related to the test.
If Factor VIII activity is 20 percent or less, then Bethesda Quantitative, Factor VIII will be added. Additional charges apply.
Hotline History
N/A
CPT Codes
The American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* 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
Other names that describe the test. Synonyms.
Factor VIII Inhibitor Profile
Bethesda Quantitative Factor VIII, Inhibitor
Coagulation Factor VIII Inhibitor Panel, Plasma
Factor 8 Inhibitor
Factor VIII Activity with Reflex to Bethesda Quantitative, Factor VIII
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