Rheumatoid factor measurement (primary care)
Name rheumatoid_factor_gprd
Chapter Musculoskeletal diseases/Rheumatoid arthritis
Measurement of rheumatoid factor in primary care. 
Data Type Categorical
Data sources GPRD
Repeated Yes
Valid event date range 01/01/1900 - 25/03/2010
Agreed 27/06/2013 (Revision 1)
Category Definition
0 Not positive
1 Positive
9 Unknown
If result is higher than 25 iu/mL, then the result is positive. If the result is lower or equal to 25 iu/mL then the result is not positive.
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Category (code) Clinical code Clinical term Datasource lookup
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