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.
Test is used to measure the concentration of plasma factor-H, a complement regulatory protein. The target patient population may include individuals undergoing workup for atypical hemolytic uremic syndrome (aHUS), complement 3 glomerulopathy (C3G), and age-related macular degeneration (AMD), among other diseases.
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.
Pink (K2EDTA), tan (K2EDTA), royal blue (K2EDTA), or lavendar (EDTA).
Specimen PreparationInstructions for specimen prep before/after collection and prior to transport.
Separate plasma from cells within 2 hours of collection. Transfer plasma (minimum 0.5 mL) to an ARUP standard transport tube and freeze immediately.
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.
Nonfrozen specimens. Specimens exposed to repeated freeze/thaw cycles. Grossly hemolyzed, lipemic, and icteric specimens. Serum samples. Heparinized and lithium plasma samples.
RemarksAdditional specimen collection, transport, or test submission information.
StabilityAcceptable times/temperatures for specimens. Times include storage and transport time to ARUP.
Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 30 days
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.
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