Fulham, is there a possibility that the titer is 1:160? Most agglutination testing result starts at a value of 1:40, and progress by repeated dilution by half, so the next result would be 1:80, then 1:160, 1:320, and so on.

It's very difficult to find an actual conversion table for nephelometric (IU) to agglutination (titer) values, but normal ranges seem to indicate that 60 IU is roughly equal to 1:80 titer, and mathematically, that would make 128 roughly equivalent to 1:160 (remember that the IU can change by a value of one, while the titer has to progress by doubling the second number so there are no "in between" values with titer).

Generally a titer of 1:80 is considered normal or "non-reactive", and 1:160 and up is considered significant. There doesn't seem to be much of a corelation between high RF and severity of symptoms with Sjogrens, but with Rheumatoid Arthritis, higher titers can be indicators of the degree of joint damage potential.