Over the last 17 years, I have had quite a few CRP blood tests. Once it was slightly high ( 25), but on all other situations, it has been normal. Once I had severe back pain, and even then it was normal. My rheumatologist said that this is a common finding, that with AS , CRP does not always go up. Is this a finding with others on this forum ?

Age 56. Psoriatic spondylitis. HLA B27 negative. MRI negative.