titer for rheumatoid arthritis
The results of the rheumatoid factor (RF) test may be reported in titers or units: 1  A titer is a measure of how much the blood sample can be diluted before RF can no longer be detected.2  Nephelometry units show how much light is blocked by the blood sample in the tube.he results of the rheumatoid factor (RF) test may be reported in titers or units: 1  A titer is a measure of how much the blood sample can be diluted before RF can no longer be detected.