My 18 year old son had a partial cell blood test come back negative- also had endoscopy just before Xmas and diagnosed with inflammation of stomach lining . , I (mum and my father have /had PA . I'm sure the result is showing false positive for P.A, can anyone tell me what the MMA test is? I had intrinsic factor tested which showed positive result for PA. thank you . Taking son. Ack to GP in two weeks. Son has some symptoms - sighs and fatigue.