Ordering RecommendationRecommendations when to order or not order the test. May include related or preferred tests.
When used in conjunction with other autoantibody tests (ANCA, MPO), may assist in differentiating suspected Wegener granulomatosis (WG) from other vasculitides. May be useful when monitoring patients with PR3 antibodies.
Panel tests are available. For the workup of suspected vasculitis, refer to ANCA-Associated Vasculitis Profile (ANCA/MPO/PR3) Reflex to ANCA Titer (2006480). For patients with a history of vasculitis, refer to the ANCA Reflex to Titer and MPO/PR3 Antibodies (2002068).
MnemonicUnique test identifier.
PR3
MethodologyProcess(es) used to perform the test.
Semi-Quantitative Multiplex Bead Assay
PerformedDays of the week the test is performed.
Sun-Sat
ReportedExpected turnaround time for a result, beginning when ARUP has received the specimen.
1-2 days
New York DOH Approval StatusIndicates test has been approved by the New York State Department of Health.
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect
Serum separator tube.
Specimen Preparation
Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.2 mL)
Storage/Transport Temperature
Refrigerated.
Unacceptable Conditions
Plasma, urine, or other body fluids. Contaminated, hemolyzed, or severely lipemic specimens.
Remarks
Stability
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)
Reference IntervalNormal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Negative
19 AU/mL or less
Equivocal
20-25 AU/mL
Positive
26 AU/mL or greater
Interpretive DataBackground information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
Approximately 85% of patients with a C-ANCA pattern by IFA have antibodies specific for PR3.
CPT CodesThe 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.
AliasesOther names that describe the test. Synonyms.
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