Prostatic acid phosphatase (PAP) is an enzyme produced by the prostate. It may be found in increased amounts in men who have prostate cancer or other diseases.

This is also the same enzyme that is found in significant amounts in female ejaculate.

The highest levels of acid phosphatase are found in metastasized prostate cancer. Diseases of the bone, such as Paget's disease or hyperparathyroidism, diseases of blood cells, such as sickle-cell disease or multiple myeloma or lysosomal storage diseases, such as Gaucher's disease, will show moderately increased levels.

Certain medications can cause temporary increases or decreases in acid phosphatase levels. Manipulation of the prostate gland through massage, biopsy or rectal exam before a test can increase the level.

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Prostataspezifische saure Phosphatase