PSA refers to prostate-specific antigen, its free prostate-specific antigen FPSA, both of which are important indicators to screen for prostate tumors. PSA is somewhat specific and is only expressed on prostate tissue in human males, but not in other tissues and cells. elevated PSA is usually indicative of prostatitis, prostate cancer, or prostate hyperplasia, but not necessarily of malignancy. The FPSA is the free state of PSA, and the ratio of FPSA to PSA usually reflects the patient’s chance of having prostate cancer, with a normal value of 0.16. When the ratio of FPSA to PSA is lower than 0.16, it suggests that the patient may have prostate cancer, and the lower the ratio the greater the chance of having cancer.
When there is only one test result, there is no need to worry if it is low. A mild low is usually not a big deal and should be reviewed regularly, but if it is much lower, imaging tests such as prostate ultrasound and CT are needed to aid in the diagnosis, and if necessary, puncture pathology can be performed to confirm the diagnosis.