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Test Code 5139 Rheumatoid Factor, Quantitative, Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory



Literature Reference:

Package insert: RF II, Tina-Quant. Roche Diagnostics,9/2013.

Specimen Requirements

Specimen Type: Plasma
Container/Tube: Mint-green top (lithium heparin)
Specimen Volume: Full tube


Day(s) Test Set Up

Monday through Sunday

Turnaround Time:
STAT: not available
Routine: 2 to 4 hours after receipt in laboratory

Reference Values

<15 IUnits/mL

Literature References:

1. Rose NR, Friedman H, Fahey JL, eds. Manual of clinical laboratory immunology. 3rd ed. Washington, D.C.: American Society for Microbiology, 1986:759-61.

2. Stites DP, Stobo JD, Wells JV, eds. Basic and clinical immunology. 6th ed. Norwalk: Appleton & Lange, 1987:361

Test Classification and CPT Coding


Additional Information

For BJH Laboratory Use Only

Alternate Tube:

1 dark green-top (lithium heparin) tube

1 red-top tube
1 lavender-top (EDTA) tube
Analyte Stability:
When separated from cells, specimen is stable for 24 hours at ambient temperature (20° C-25° C), 4 days refrigerated (2° C-8° C), and 3 months at -20° C.
Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000.

Specimen Transport Temperature


LOINC Code Information

Name LOINC Code
Rheumatoid Factor 11572-5