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Test Code RA.1 RHEUMATOID FACTOR

Methodology

Immunoturbidimetric

Useful for detecting the presence of rheumatoid factor in human serum. Elevated levels are associated with rheumatoid arthritis, but may also be seen with conditions such as syphilis, bacterial endocarditis, myocardial infarction, renal disease, malignancy, and thyroid disease.

Specimen Requirements

Submit only 1 of the following specimens:
 
Preferred:

Serum Gel Tube

Container/Tube: Serum gel tube(s)
Specimen Volume: 1.0 mL (minimum volume: 0.25 mL) of serum-Markedly lipemic specimen is not acceptable.

Collection Instructions: Spin down within 2 hours of draw.

 

Alternate:

Plain, Red-Top Tube

Container/Tube: Plain, red-top tube(s)
Specimen Volume: 1.0 mL (minimum volume: 0.25 mL) of serum-Markedly lipemic specimen is not acceptable.

Collection Instructions: Spin down within 2 hours of draw.

 

Alternate:

Heparinized plasma

Container/Tube: Green-top (lithium heparin or sodium heparin) tube(s)
Specimen Volume: 1.0 mL (minimum volume: 0.25 mL) of serum-Markedly lipemic specimen is not acceptable.

Collection Instructions: Spin down within 2 hours of draw.

 

Alternate:

EDTA plasma

Container/Tube:  Lavender-top (EDTA) tube(s) with HemogardTM lid or lavender MICROTAINER®
Specimen Volume: 1.0 mL (minimum volume: 0.25 mL) of serum-Markedly lipemic specimen is not acceptable.

Collection Instructions: Spin down within 2 hours of draw.

Day(s) Test Set Up

Monday through Sunday

Reference Values

<12 IU/mL

 

Performing Laboratory

Logan Health Medical Center Laboratory

Test Classification and CPT Coding

86431

 

Specimen Transport Temperature

Refrigerate