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Rheumatoid Factor by Turbidimetry (RDL)

CPT 86431

Test Details

Methodology

Turbidimetry

Result Turnaround Time

7 - 14 days

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Test Includes

This test is a component of ANA 12 Plus Profiles, RAdx3 (RheumAssure), RAdx5, Arthritis Profile (RLD) and ILDdx.

Use

IgM‐RF is the main isotype identified by clinically available diagnostic assays for RF detection. The most consistent serological finding in patients with Rheumatoid Arthritis (RA) is an increase in the concentration of RF IgM in blood and synovial fluid.

Specimen Requirements

Specimen

Serum

Volume

1 mL

Minimum Volume

0.3 mL (Note: This volume does not allow for repeat testing.)

Container

Red-top tube or gel-barrier tube

Collection Instructions

Separate serum from cells within one hour of collection. Transfer to a plastic transport tube before shipping. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Stability Requirements

Temperature

Period

Room temperature

7 days

Refrigerated

14 days

Frozen

60 days

Freeze/thaw cycles

Stable x1

Storage Instructions

Refrigerate or freeze.

Causes for Rejection

Grossly hemolyzed; bacterial contamination; lipemic specimen; icteric specimen; non-serum specimen types

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
520129 Rheumatoid Factor by Turb(RDL) 11572-5 520132 Rheumatoid Factor by Turb RDL IU/mL 11572-5
Order Code520129
Order Code NameRheumatoid Factor by Turb(RDL)
Order Loinc11572-5
Result Code520132
Result Code NameRheumatoid Factor by Turb RDL
UofMIU/mL
Result LOINC11572-5