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Recommendations when to order or not order the test. May include related or preferred tests.
Useful in combination with Factor VIII, Activity (0030095) for the initial diagnosis of mild hemophilia A. May also be used to measure factor VIII activity in the presence of a lupus anticoagulant. Monitor certain extended half-life factor VIII replacement products and measure native factor VIII or factor VIII concentrates in patients on emicizumab (Hemlibra).
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.
Light Blue (Sodium Citrate). Special Specimen Collection and Handling Hemostasis/Thrombosis Specimens guide located at https://www.aruplab.com/Specimen-Handling/SpecialSpecimenCollection/Hemostasis-Thrombosis.pdf
Specimen PreparationInstructions for specimen prep before/after collection and prior to transport.
Transfer 1 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 0.8 mL)
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 or 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 New York State Clients: Ambient: 4 hours; Refrigerated: 4 hours; Frozen: 2 weeks
Methodology
Process(es) used to perform the test.
Chromogenic Assay
Performed
Days of the week the test is performed.
Mon, Wed, Fri
Reported
Expected turnaround time for a result, beginning when ARUP has received the specimen.
1-4 days
Reference Interval
Normal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Age
Reference Interval
0-6 years
56-191 percent
7-9 years
76-199 percent
10-11 years
80-209 percent
12-13 years
72-198 percent
14-15 years
69-237 percent
16-17 years
63-221 percent
18 years and older
56-191 percent
Interpretive Data
May include disease information, patient result explanation, recommendations, or details of testing.
Information on the clinical uses of chromogenic FVIII activity testing can be found at arupconsult.com.
Compliance Category
Laboratory Developed Test (LDT)
Note
Additional information related to the test.
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 activity, chromogenic
Factor VIII chromogenic assay
Hemlibra; emicizumab, extended half-life factor VIII products
Coagulation Factor VIII Chromogenic activity assay, plasma
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