How are specimens collected and prepared for rheumatoid factors (RFs) assays?

Updated: Jan 28, 2021
  • Author: Tyler Street, MD; Chief Editor: Eric B Staros, MD  more...
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Collection details are as follows:

  • Specimen type - Serum

  • Container/tube - Red top, gold top or tiger top preferred (gel- bottom tube best, but any serum-type tube adequate)

  • Specimen volume - 1 mL, 0.5 mL minimum [8]

  • Reject specimens in cases of gross lipemia [8]

  • Specimen stability – Refrigerated (preferred) 14 days, ambient 14 days, frozen 14 days

  • Test often included in autoimmune panels

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