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RHEUMATOID FACTOR, Serum (087-0122)
Test Mnemonic:


Specimen Requirements:

Routine venipuncture.  7 mL SST (gel barrier) or red-topped tube.  Acceptable: 7 mL Plasma samples Lithium Heparin and Sodium Heparin (Min. : 3mL of blood).

Minimum Volume:

3 mL


Delivered to Sample Management within 2 hours of collection.

Specimen Preparation:

Allow specimen to clot completely at room temperature. Centrifuge to separate serum from cells within 2 hours of collection. Transfer serum from collection tube to labeled plastic transport tube. 


Room temperature for ≤ 8 hours, refrigerated for ≤ 7 days.  Frozen samples are not recommended.

Causes for Rejection:

Incomplete and/or incorrect sample identification, improper storage/transport , and gross hemolysis or lipemia                                                                      

Reference Range:

By report (reports may vary based on instrumentation, patient age and sex)

Turnaround Time:

Monday - Sunday: 7am - 3:00pm




Special Chemistry, 

Monday - Sunday: 7am - 3:00pm

CPT 4 Code:



Director approval required for STAT requests.

When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent.
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