The normal range of rheumatoid factor in blood is usually below 15 international units per milliliter or a titer of 1 to 80. The normal range may vary slightly depending on different laboratories.

For most laboratories, values below 15 IU/mL or titers below 1:80 fall within the normal range. Numbers exceeding these thresholds indicate elevated rheumatoid factor levels, possibly suggesting ...

Rheumatoid factor (RF) is a type of antibody ... Rheumatoid factors are also associated with a wide range of other autoimmune and non-autoimmune diseases. IgA is found in various secretions ...

People with RA produce a specific type of antibody, known as rheumatoid factor (RF ... The expected normal value for the RA latex turbid test is less than 14 international units per milliliter ...

(Previous complete blood counts were reportedly normal ... a rheumatoid factor level of 281 IU per milliliter (normal value, <13), an anti-Ro52 antibody level of more than 1684 CU (normal range ...