The main laboratory tests for prostate cancer are rectal palpation combined with prostate-specific antigen examination. If there are abnormal results, imaging examination and pathological examination are also needed to further clarify the diagnosis. 1. Rectal examination: Since most prostate cancers occur in the peripheral band of the prostate, which is next to the front wall of the rectum, the doctor can examine the size, texture, and the presence of hard nodules of the prostate through rectal examination. 2. Prostate Specific Antigen (PSA) test: A blood sample is taken from a vein in the arm and analyzed for PSA levels. It is normal to have a small amount of PSA in the blood, and when prostate cancer occurs, PSA is usually higher than normal. However, there are benign PSA that will be higher than normal, so it should only be used as a screening test. 3. Imaging examination: When the test (PSA) shows abnormality, patients usually need to undergo ultrasound, prostate CT, MRI or even whole-body bone scan to further clarify the diagnosis. 4. Pathology: A prostate puncture biopsy is an important test for diagnosing prostate cancer. The test is performed by inserting a puncture needle into the prostate gland to collect prostate tissue for analysis to confirm the presence of cancer cells. No matter which kind of examination is conducted, it should be carried out in regular hospitals.