Dies Azathioprine affect diagnosis?

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Hi, I’ve been referred to a rheumatologist for possible lupus. I already have autoimmune liver diseases. I was on azathioprine for years but my hepatologist wanted to see if I could come off it and remain in remission. I couldn’t and my symptoms got worse including a lot of lupus symptoms - hence the referral to a rheumatologist. My question is: if I restart azathioprine, will this affect any blood tests the rheumatologist may want to do and impact diagnosis?