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www.reference.com/article/difference-between-psa-total-psa-5fd6bfc77023780c

Free PSA, or prostate-specific antigen, is PSA circulating unbound and by itself within a man's body. Total PSA is the sum of unbound PSA and PSA bound to other substances circulating within a man's body, according to MedicineNet.com.

www.reference.com/article/high-psa-result-830daa6305e4a4f8

There is no normal or abnormal level of prostate-specific antigen, or PSA, in the blood, according to the National Cancer Institute. Historically, doctors consider levels of 4 nanograms per milliliter of blood to be normal.

www.reference.com/article/high-psa-level-76ac943729f7f1e6

The prostate-specific antigen, or PSA, test measures the level of the prostate-specific antigen present in a man's bloodstream; PSA is a protein made by the prostate gland. Elevated PSA blood levels may indicate prostate cancer, though other conditions also cause high PSA levels, according to the Na

www.reference.com/article/normal-psa-f1bbf67c4ec48026

According to the National Cancer Institute, a normal prostate-specific antigen result is generally considered to be below 4 nanograms per milliliter. Doctors often recommend a prostate biopsy for men with higher PSA levels to determine whether prostate cancer is present.

www.reference.com/article/psa-test-b2629a83c4dd769b

A prostate-specific antigen, or PSA, test is intended to measures the level of PSA in the blood. Prostate-specific antigen is a protein that is produced in the prostate gland. This test is carried out by a doctor when trying to diagnose the presence of cancer.

www.reference.com/article/normal-psa-number-c3b5ae1aed77c6de

There isn't a prostate-specific antigen level that is considered normal or abnormal, explains the National Cancer Institute. Generally, higher PSA levels increase the likelihood of prostate cancer, or if PSA results rise continuously over time, the risk for cancer also increases.

www.reference.com/article/increases-psa-levels-ef3c906633e3ef25

An increase in protein-specific antigen (PSA) levels may be associated with many medical conditions that can affectthe prostate gland, such ascancer, benign prostatic hyperplasia, prostatitis and an infection. Another factor that alsomay raise the PSA level is the aging process, relates MedicineNet.

www.reference.com/article/bad-psa-levels-a7b7bb6c52d7a5f9

Abnormal levels of PSA, or prostate-specific antigen, generally do not exist, states the National Cancer Institute. Historically, PSA levels above 4.0 nanograms per milliliter often required a prostate biopsy to test for cancer, but studies show that prostate cancer can exist in patients with PSA le

www.reference.com/article/good-bad-psa-levels-7e2880508c9a5c38

There is no specific normal or abnormal level of PSA in the blood, according to the National Cancer Institute. In general, the higher a man's PSA level, the more likely it is that he has prostate cancer.

www.reference.com/article/psa-count-6-5100895e348d58a8

In the past, a PSA of 6 may have indicated the presence of prostate cancer. However, according to the National Cancer Institute, new research indicates that healthy prostate function can produce a PSA of 6 or higher.