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.
Initial screening for suspected deficiency in the alternative complement pathway.
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.
Plain Red
Specimen PreparationInstructions for specimen prep before/after collection and prior to transport.
Allow specimen to clot for one hour at room temperature. Separate serum from cells ASAP and centrifuge at 2-8 degrees C and aliquot serum into ARUP standard transport tube. Freeze specimen immediately at -70 degrees C or lower freezer. (Min: 0.3 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.
Specimen types other than serum collected from RED TOP tubes. SST or serum gel tubes are not acceptable. Refrigerated or room temperature specimens. Specimens left to clot at refrigerated temperature. Specimens exposed to repeated freeze/thaw cycles. Grossly hemolyzed or grossly lipemic specimens or icteric specimens.
RemarksAdditional specimen collection, transport, or test submission information.
StabilityAcceptable times/temperatures for specimens. Times include storage and transport time to ARUP.
After separation from cells: Ambient: unacceptable; Refrigerated: Unacceptable; Frozen: 30 days if kept at -70 C
Expected turnaround time for a result, beginning when ARUP has received the specimen.
7-14 days
Reference Interval
Normal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Test Number
Components
Reference Interval
Alternative Complement Pathway Activity
31 percent normal or greater
Interpretive Data
May include disease information, patient result explanation, recommendations, or details of testing.
See report.
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.
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