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PSA with Free PSA ratio (SERUM)

PSA with Free PSA ratio (SERUM):PSA with Free PSA ratio (SERUM)

Overview

"Prostate specific antigen (PSA) is a protein produced primarily by cells in the prostate, a small gland that encircles the urethra in males and produces a fluid that makes up part of semen. Most of the PSA that the prostate produces is released into this fluid, but small amounts of it are also released into the bloodstream. This test measures the amount of PSA in the blood.

The PSA test is used as a tumor marker to screen for and to monitor prostate cancer. It is a good tool but not a perfect one, and most experts agree that screening should be done on asymptomatic men only after thorough discussions with their healthcare providers on the benefits and risks and after informed decisions are made to undergo screening. Elevated levels of PSA are associated with prostate cancer, but they may also be seen with prostatitis and benign prostatic hyperplasia (BPH). PSA levels tend to increase in all men as they age, and men of African American heritage may have levels that are higher than other men, even at earlier ages.

PSA is not diagnostic of cancer. The gold standard for identifying prostate cancer is the prostate biopsy, collecting small samples of prostate tissue and identifying abnormal cells under the microscope. (Read the article on Anatomic Pathology for more information on biopsies.) The total PSA test and digital rectal exam (DRE) are used together to help determine the need for a prostate biopsy.

PSA exists in two main forms in the blood: complexed (cPSA, bound to other proteins) and free (not bound). The most frequently used PSA test is the total PSA, which measures the sum of complexed and the free PSA in the blood.

The free PSA test is sometimes used to help to determine whether a biopsy should be done when the total PSA is only slightly elevated. PSA is an enzyme (protein that helps different chemical reactions to occur) and when it is released into the blood, some circulating proteins inactivate PSA by binding to it. Benign prostate cells in BPH tend to release PSA that is not active (and, therefore, less likely to be bound by circulating proteins) and cancerous prostate cells tend to release PSA that is already protein-bound.

Therefore, men with BPH tend to have higher levels of free PSA and men with prostate cancer tend to have lower amounts of free PSA. A relatively low level of free PSA increases the chances that a cancer is present, even if the total PSA is not significantly elevated.

** Why to test PSA with Free PSA ratio (SERUM)?**

PSA test is done to screen men for prostate cancer, to help determine the necessity for a biopsy of the prostate, to monitor the effectiveness of treatment for prostate cancer, and/or to detect recurrence of prostate cancer. When a man has symptoms suggestive of prostate cancer such as difficult, painful, and/or frequent urination; may also be ordered during and at regular intervals after prostate cancer treatment; in asymptomatic men, after a discussion with your healthcare provider about the benefits and harms of screening and you make an informed decision to undergo screening.

** When to test PSA with Free PSA ratio (SERUM)?**

For men who wish to be screened for prostate cancer, the American Cancer Society recommends that healthy men of average risk consider waiting to get tested until age 50, while the American Urological Association recommends screening for men between the ages of 55 and 69 with no routine screening after age 70.

For those at high risk, such as American men of African descent and men with a family history of the disease, the recommendation is to consider beginning testing at age 40 or 45.

The total PSA test and digital rectal exam (DRE) may also be ordered when a man has symptoms that could be due to prostate cancer, such as difficult, painful, and/or frequent urination, back pain, and/or pelvic pain.

If a total PSA level is elevated, a healthcare provider may order a repeat test a few weeks later to determine whether the PSA concentrations have returned to normal.

A free PSA is primarily ordered when a man has a moderately elevated total PSA. The results give the healthcare provider additional information about whether the person is at an increased risk of having prostate cancer and help with the decision of whether to biopsy the prostate.

The total PSA may be ordered at regular intervals during treatment of men who have been diagnosed with prostate cancer and when a man with cancer is participating in """"watchful waiting"""" and not currently treating his prostate cancer. "

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