Rheumatoid factor unit converter
Rheumatoid factor (IgM antibodies against IgG), quantitative
Also known as: RF, RF-IgM, Rheumatoid factor IgM
Converter
Enter a value in any unit and all other units fill in.
Conversion formulas
| Equivalent notations | IU/mL = kIU/L | 1 : 1 |
|---|
Good to know
Rheumatoid factor (RF) is reported in IU/mL or in kIU/L, which are numerically identical.
- 1 IU/mL = 1 kIU/L.
- Some laboratories report a titre (for example 1:80) instead of IU/mL; the two cannot be converted into each other.
Reference range
| Unit | Adults |
|---|---|
| IU/mL = kIU/L | 0 – 15 |
Source: MedlinePlus (NLM): Rheumatoid factor (RF) · Last reviewed: 2026-10-19
Note from the source: Below 15 IU/mL (or titre below 1:80) (MedlinePlus). A positive result also occurs in healthy older people and in other diseases