What is acid phosphatase assays test?

Max 3.2 ng: Sensitivity of prostatic acid phosphatase is very low 39% of the prostatic carcinomas acid phosphatase level was below the upper limit of normal fixed at 3.2ng. Specificity is high t 96% of cases with abnormally high ri acid phosphatase levels, the diagnosis was adenocarcinoma. In the absence of bone metastases high acid phosphatase level is predictive of lymph node involvement in 90%.