Ordering Recommendation

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).

Mnemonic

PR3

Methodology

Semi-Quantitative Multiplex Bead Assay

Performed

Sun-Sat

Reported

1-2 days

New York DOH Approval Status

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 Interval

Negative 19 AU/mL or less
Equivocal 20-25 AU/mL
Positive 26 AU/mL or greater

Interpretive Data

Approximately 85% of patients with a C-ANCA pattern by IFA have antibodies specific for PR3.

Compliance Category

FDA

Note

Hotline History

N/A

CPT Codes

83516

Components

Component Test Code* Component Chart Name LOINC
0050527 Serine Proteinase 3, IgG 6968-2
* 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

  • PR3
  • PR3 Ab
  • PR3 IgG Antibodies
Serine Proteinase 3 (PR3) Antibody