Reumatoid factor (RF)

Reumatoid factor (RF) values and definitions

Negative referent values of reumatoid factor (rf) test are between 0 and <20 U/mL.
Lower limit:
| Upper limit:
Unit:
Diagnose:
0   -
<20
U/mL
negative

Equivocal referent values of reumatoid factor (rf) test are between 20 and 30 U/mL.
Lower limit:
| Upper limit:
Unit:
Diagnose:
20   -
30
U/mL
Equivocal

Positive referent values of reumatoid factor (rf) test are between >30 and n/a U/mL.
Lower limit:
| Upper limit:
Unit:
Diagnose:
>30   -
n/a
U/mL
positive

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