Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

RHEUMATOID FACTOR, QUANTITATIVE

General Information

Lab Order Codes:

RA

Synonyms:

RF; RA, Rheumatoid Arthritis Factor

CPT Codes:

86431– Rheumatoid factor; quantitative

Test Includes:

Rheumatoid factor concentration reported in IU/mL.

Logistics

Test Indications:

Rheumatoid factor quantitates autoantibodies directed against IgG immunoglobulins and are members of a class of proteins that become elevated in inflammatory states. RA is most sensitive for monitoring the level of inflammation associated with rheumatoid arthritis.

Lab Testing Sections:

Chemistry (all specimens analyzed on the Mpls campus)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 day

Special Instructions:

N/A

Specimen

Specimen Type:

Blood

Container:

Green top (Li Heparin) top tube (preferred)
Alternate: Red top (plain, no gel) tube

Draw Volume:

0.6 mL blood

Processed Volume:

0.2 mL serum

Collection:

Routine collection

Special Processing:

Lab Staff: Centrifuge specimen, remove plasma/serum aliquot into a plastic sample cup. Specimens can be stored refrigerated for 7 days or frozen for 3 months. Centrifuge turbid or particulate samples prior to analysis.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimen; turbid samples that do not clear after centrifugation

Interpretive

Reference Range:

<15 IU/mL

Critical Values:

N/A

Limitations:

N/A

Methodology:

Nephelometry, Siemens Dimension Vista 500

References:

Tietz, NW, Textbook of Clinical Chemistry (1999) WB Saunders Co., Philadelphia, PA, pp 42-50, pp 507-512

Siemens Dimension Vista RF Flex Insert P/N K7068G00E0803, Rev 3/2011

Updates:


4/29/2014: Plasma added as preferred specimen type.



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