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What is a worrisome PSA?

About 15% of men with a PSA below 4 will have prostate cancer if a biopsy is done. Men with a PSA level between 4 and 10 (often called the “borderline range”) have about a 1 in 4 chance of having prostate cancer. If the PSA is more than 10, the chance of having prostate cancer is over 50%.

cancer.org - Prostate Cancer Screening Tests - American Cancer Society

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Screening Tests for Prostate Cancer

Screening is testing to find cancer in people before they have symptoms. It’s not clear, however, if the benefits of prostate cancer screening outweigh the risks for most men. Still, after discussing the pros and cons of screening with their doctors, some men might reasonably choose to be screened. The screening tests discussed here are used to look for possible signs of prostate cancer. But these tests can’t tell for sure if you have cancer. If the result of one of these tests is abnormal, you will probably need a prostate biopsy (discussed below) to know for sure if you have cancer.

Prostate-specific antigen (PSA) blood test

Prostate-specific antigen (PSA) is a protein made by cells in the prostate gland (both normal cells and cancer cells). PSA is mostly found in semen, but a small amount is also found in blood. The PSA level in blood is measured in units called nanograms per milliliter (ng/mL). The chance of having prostate cancer goes up as the PSA level goes up, but there is no set cutoff point that can tell for sure if a man does or doesn’t have prostate cancer. Many doctors use a PSA cutoff point of 4 ng/mL or higher when deciding if a man might need further testing, while others might recommend it starting at a lower level, such as 2.5 or 3. Most men without prostate cancer have PSA levels under 4 ng/mL of blood. When prostate cancer develops, the PSA level often goes above 4. Still, a level below 4 is not a guarantee that a man doesn’t have cancer. About 15% of men with a PSA below 4 will have prostate cancer if a biopsy is done. When prostate cancer develops, the PSA level often goes above 4. Still, a level below 4 is not a guarantee that a man doesn’t have cancer. About 15% of men with a PSA below 4 will have prostate cancer if a biopsy is done. Men with a PSA level between 4 and 10 (often called the “borderline range”) have about a 1 in 4 chance of having prostate cancer. If the PSA is more than 10, the chance of having prostate cancer is over 50%. If your PSA level is high, you might need further tests to look for prostate cancer (see ‘If screening test results aren’t normal’, below).

Factors that might affect PSA levels

One reason it’s hard to use a set cutoff point with the PSA test when looking for prostate cancer is that a number of factors other than cancer can also affect PSA levels.

Factors that might raise PSA levels include:

An enlarged prostate: Conditions such as benign prostatic hyperplasia (BPH), a non-cancerous enlargement of the prostate that affects many men as they grow older, can raise PSA levels. Conditions such as (BPH), a non-cancerous enlargement of the prostate that affects many men as they grow older, can raise PSA levels. Older age: PSA levels normally go up slowly as you get older, even if you have no prostate abnormality. PSA levels normally go up slowly as you get older, even if you have no prostate abnormality. Prostatitis: This is an infection or inflammation of the prostate gland, which can raise PSA levels. This is an infection or inflammation of the prostate gland, which can raise PSA levels. Ejaculation: This can make the PSA go up for a short time. This is why some doctors suggest that men abstain from ejaculation for a day or two before testing. This can make the PSA go up for a short time. This is why some doctors suggest that men abstain from ejaculation for a day or two before testing. Riding a bicycle: Some studies have suggested that cycling may raise PSA levels for a short time (possibly because the seat puts pressure on the prostate), although not all studies have found this. Some studies have suggested that cycling may raise PSA levels for a short time (possibly because the seat puts pressure on the prostate), although not all studies have found this. Certain urologic procedures: Some procedures done in a doctor’s office that affect the prostate, such as a prostate biopsy or cystoscopy, can raise PSA levels for a short time. Some studies have suggested that a digital rectal exam (DRE) might raise PSA levels slightly, although other studies have not found this. Still, if both a PSA test and a DRE are being done during a doctor visit, some doctors advise having the blood drawn for the PSA before having the DRE, just in case. Some procedures done in a doctor’s office that affect the prostate, such as a prostate biopsy or cystoscopy, can raise PSA levels for a short time. Some studies have suggested that a digital rectal exam (DRE) might raise PSA levels slightly, although other studies have not found this. Still, if both a PSA test and a DRE are being done during a doctor visit, some doctors advise having the blood drawn for the PSA before having the DRE, just in case. Certain medicines: Taking male hormones like testosterone (or other medicines that raise testosterone levels) may cause a rise in PSA.

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Some things might lower PSA levels (even if a man has prostate cancer): 5-alpha reductase inhibitors: Certain drugs used to treat BPH or urinary symptoms, such as finasteride (Proscar or Propecia) or dutasteride (Avodart), can lower PSA levels. These drugs can also affect prostate cancer risk (discussed in Can Prostate Cancer Be Prevented?). Tell your doctor if you are taking one of these medicines. Because they can lower PSA levels, the doctor might need to adjust for this. Certain drugs used to treat BPH or urinary symptoms, such as finasteride (Proscar or Propecia) or dutasteride (Avodart), can lower PSA levels. These drugs can also affect prostate cancer risk (discussed in Can Prostate Cancer Be Prevented?). Tell your doctor if you are taking one of these medicines. Because they can lower PSA levels, the doctor might need to adjust for this. Herbal mixtures: Some mixtures that are sold as dietary supplements might mask a high PSA level. This is why it’s important to let your doctor know if you are taking any type of supplement, even ones that are not necessarily meant for prostate health. Saw palmetto (an herb used by some men to treat BPH) does not seem to affect PSA. Some mixtures that are sold as dietary supplements might mask a high PSA level. This is why it’s important to let your doctor know if you are taking any type of supplement, even ones that are not necessarily meant for prostate health. Saw palmetto (an herb used by some men to treat BPH) does not seem to affect PSA. Certain other medicines: Some research has suggested that long-term use of certain medicines, such as aspirin, statins (cholesterol-lowering drugs), and thiazide diuretics (such as hydrochlorothiazide) might lower PSA levels. More research is needed to confirm these findings. If you take any of the medicines regularly, talk to your doctor before you stop taking it for any reason. For men who might be screened for prostate cancer, it’s not always clear if lowering the PSA is helpful. In some cases the factor that lowers the PSA may also lower a man’s risk of prostate cancer. But in other cases, it might lower the PSA level without affecting a man’s risk of cancer. This could actually be harmful, if it were to lower the PSA from an abnormal level to a normal one, as it might result in not detecting a cancer. This is why it’s important to talk to your doctor about anything that might affect your PSA level.

Special types of PSA tests

The PSA level from a screening test is sometimes referred to as total PSA, because it includes the different forms of PSA (described below). If you decide to get a PSA screening test and the result isn’t normal, some doctors might consider using different types of PSA tests to help decide if you need a prostate biopsy, although not all doctors agree on how to use these tests. If your PSA test result isn’t normal, ask your doctor to discuss your cancer risk and your need for further tests. Percent-free PSA: PSA occurs in 2 major forms in the blood. One form is attached to blood proteins, while the other circulates free (unattached). The percent-free PSA (%fPSA) is the ratio of how much PSA circulates free compared to the total PSA level. The percentage of free PSA is lower in men who have prostate cancer than in men who do not. If your PSA test result is in the borderline range (between 4 and 10), the percent-free PSA might be used to help decide if you should have a prostate biopsy. A lower percent-free PSA means that your chance of having prostate cancer is higher and you should probably have a biopsy. Many doctors recommend a prostate biopsy for men whose percent-free PSA is 10% or less, and advise that men consider a biopsy if it is between 10% and 25%. Using these cutoffs detects most cancers and helps some men avoid unnecessary biopsies. This test is widely used, but not all doctors agree that 25% is the best cutoff point to decide on a biopsy, and the cutoff may change depending on the overall PSA level.

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Complexed PSA: This test directly measures the amount of PSA that is attached to other proteins (the portion of PSA that is not “free”). This test could be done instead of checking the total and free PSA, and it could give the same amount of information, but it is not widely used. Tests that combine different types of PSA: Some newer tests combine the results of different types of PSA to get an overall score that reflects the chance a man has prostate cancer (particularly cancer that might need treatment).These tests include: The Prostate Health Index (PHI), which combines the results of total PSA, free PSA, and proPSA The 4Kscore test, which combines the results of total PSA, free PSA, intact PSA, and human kallikrein 2 (hK2), along with some other factors These tests might be useful in men with a slightly elevated PSA, to help determine if they should have a prostate biopsy. These tests might also be used to help determine if a man who has already had a prostate biopsy that didn’t find cancer should have another biopsy. PSA velocity: The PSA velocity is not a separate test. It is a measure of how fast the PSA rises over time. Normally, PSA levels go up slowly with age. Some research has found that these levels go up faster if a man has cancer, but studies have not shown that the PSA velocity is more helpful than the PSA level itself in finding prostate cancer. For this reason, the ACS guidelines do not recommend using the PSA velocity as part of screening for prostate cancer. PSA density: PSA levels are higher in men with larger prostate glands. The PSA density (PSAD) is sometimes used for men with large prostate glands to try to adjust for this. The doctor measures the volume (size) of the prostate gland with transrectal ultrasound (discussed in Tests to Diagnose and Stage Prostate Cancer) and divides the PSA number by the prostate volume. A higher PSA density indicates a greater likelihood of cancer. PSA density has not been shown to be as useful as the percent-free PSA test. Age-specific PSA ranges: PSA levels are normally higher in older men than in younger men, even when there is no cancer. A PSA result within the borderline range might be worrisome in a 50-year-old man but cause less concern in an 80-year-old man. For this reason, some doctors have suggested comparing PSA results with results from other men of the same age. But the usefulness of age-specific PSA ranges is not well proven, so most doctors and professional organizations (as well as the makers of the PSA tests) do not recommend their use at this time.

Digital rectal exam (DRE)

For a digital rectal exam (DRE), the doctor inserts a gloved, lubricated finger into the rectum to feel for any bumps or hard areas on the prostate that might be cancer. As shown in the picture below, the prostate is just in front of the rectum. Prostate cancers often begin in the back part of the gland, and can sometimes be felt during a rectal exam. This exam can be uncomfortable (especially for men who have hemorrhoids), but it usually isn’t painful and only takes a short time.

cancer.org - Prostate Cancer Screening Tests - American Cancer Society

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