Usually a negative acid phosphatase is normal. Acid phosphatase is a laboratory test such as vaginal secretions and urine, which can be used to screen for prostatitis and prostate cancer, or to diagnose and differentiate between vaginitis and urinary tract infections, for example. Usually a negative acid phosphatase test is normal, meaning that there is no prostate cancer, or no significant gynecological inflammation, and is a negative acid phosphatase test. In addition, some positive acid phosphatase test reports may include acute hepatitis, cirrhosis of the liver, or the presence of some liver cancer or acute infection of the prostate.