Range for a positive RF

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Date Joined Apr 2017
Total Posts : 2
   Posted 10/16/2017 12:49 PM (GMT -6)   
Hello all! This may sound very generic question but I was wondering was the range/reference range for positive RF. A friend of mine got her results as :

In range <14 - Reference Range <14 IUB/ml. ANA IFA negative.

Any help will be greatly appreciate it

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Date Joined Jan 2011
Total Posts : 1067
   Posted 10/16/2017 8:25 PM (GMT -6)   
Hi BelM
sounds like it was below the range for RA as The normal reference range for RF is less than 15 IU/mL or less than 1:16
so if <14 that means it was Below 14 (<means less than and >means more than) and the ANA is a test for things like Lupus so that being negative was a good sign

in comparison my RF at time of diagnosis was 160 so very high

RF results are positive in approximately 80% of patients with RA however you can have RA with a negative
RF(Rheumatoid Factor)
and you can also have other conditions that show a positive RF so it is not always the Only form of identifying
Hope this heled a bit it can all be confusing
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