PSA normal range: what a high PSA level means

What is PSA?

PSA (prostate-specific antigen) is a protein made by the prostate, the gland below the bladder that makes the fluid part of semen. A small amount leaks into the blood normally. The PSA blood test is used to screen for prostate cancer and to monitor men who have been treated for it.

PSA is a prostate marker, not a cancer marker. It also rises with an enlarged prostate (benign prostatic hyperplasia), prostate inflammation and urinary infections. In general, the higher the level, the more likely cancer is, but MedlinePlus is clear that it is possible to have a high PSA without prostate cancer, or a low PSA with it. Only a biopsy can diagnose prostate cancer.

PSA levels by age

Source: Oesterling and colleagues, JAMA 1993, from 471 healthy men in Olmsted County, Minnesota, with no sign of prostate cancer (95th percentile). ng/mL and µg/L are the same number.

Many labs, including ARUP, still print a single range of 0.0 to 4.0 ng/mL. The National Cancer Institute says a PSA above 4.0 ng/mL is generally considered abnormal and may lead to a biopsy recommendation, but because PSA increases with age some doctors use a lower cut-off (such as 2.5 ng/mL) for younger men and a higher one (such as 5 ng/mL) for older men. MedlinePlus notes that for men in their 50s or younger, PSA should usually be below 2.5 ng/mL.

The same study found PSA in a healthy 60-year-old rises by about 3.2% a year (0.04 ng/mL a year), and PSA tracks prostate size, which also increases with age. That is why doctors pay attention to how fast PSA is changing, not only the number.

Add PSA to a men's hormone panelHormone Focus includes PSA for men with testosterone, estradiol and SHBG, $124 a test plus $25 shipping.

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What a high PSA means

A high PSA raises the chance of prostate cancer but has many other causes. MedlinePlus lists:

• A large prostate (benign prostatic hyperplasia)
• Prostate infection or inflammation (prostatitis) and urinary tract infections
• Recent bladder tests (cystoscopy), prostate biopsy or a catheter
• Recent ejaculation or intercourse, and recent colonoscopy

The NCI adds that vigorous exercise such as cycling can raise PSA for a short time, and that infection, inflammation or a biopsy can keep it raised for a month or two.

What usually happens next: MedlinePlus says your provider will consider your age, earlier PSA results, any prostate lump, symptoms, ethnicity and family history. Next steps may include a repeat PSA, often within 3 months (sometimes after treating an infection), a free PSA test, a prostate MRI and, if PSA stays high or keeps rising, a biopsy. Talk to your doctor about any result above the range for your age.

Worked example: a PSA of 3.9 at 52

Say a 52-year-old man gets a PSA of 3.9 ng/mL. Many labs would print it as normal because it is under 4.0, but it is above the 3.5 ng/mL limit for 50 to 59 in the Oesterling study, and MedlinePlus says PSA in men in their 50s should usually be below 2.5. Two days before the draw he rode 60 miles on his bike.

The NCI says vigorous cycling can raise PSA for a short time and advises avoiding such activities for 2 days before testing, so the first step is a clean repeat: no long rides and no ejaculation beforehand. The NCI also says a doctor may recommend another PSA test in 6 to 8 weeks to confirm a high result.

Questions for the doctor: Should we repeat PSA before anything else? If it stays above 3.5, is a free PSA, a 4Kscore test or a prostate MRI the next step? Does my family history or ancestry change how we read it? How does this compare with my earlier results?

What a low PSA means

A low PSA is the expected result. It does not completely rule out prostate cancer, which is why doctors also consider symptoms, family history and examination. Some medicines make PSA falsely low: the NCI names finasteride and dutasteride, used for an enlarged prostate, and says a lower cut-off for abnormal is used in men taking them.

What can change PSA

• Age and prostate size, which raise PSA gradually.
• Ejaculation and vigorous exercise, which raise it for a short time.
• Infection, inflammation and procedures, which can raise it for weeks.
• Finasteride and dutasteride, which lower it.
• Testosterone therapy. The Endocrine Society recommends against starting testosterone in men with a PSA above 4 ng/mL, or above 3 ng/mL in men at higher risk, without further urological evaluation. See testosterone.

How to test PSA

• Avoid sex or masturbation for 24 hours before the test (MedlinePlus). The NCI suggests avoiding activities that can raise PSA, including vigorous cycling, for 2 days.
• Do not test soon after a urinary infection, a prostate or bladder procedure, or surgery on the urinary system; ask your doctor how long to wait.
• Tell whoever orders the test about all medicines, especially finasteride or dutasteride.
• Use the same lab and method when you retest; ARUP notes results from different PSA methods cannot be used interchangeably.

Should you be screened?

PSA screening is a personal decision, not a routine test for every man. The US Preventive Services Task Force recommends that men aged 55 to 69 make an individual decision with their clinician after weighing the small potential benefit against harms such as false positives, biopsies, overdiagnosis and treatment side effects, and it recommends against PSA-based screening from age 70. The USPSTF has an update of this recommendation in progress. The Endocrine Society treats Black men and men with a first-degree relative with prostate cancer as higher risk; if that is you, raise screening with your doctor.

Which at-home tests include PSA

SiPhox Health measures PSA for men on two panels: Hormone Focus (included in the base $124 a test price) and Ultimate 360 (+$125 a test). It is not on Longevity Essentials, Heart & Metabolic, Thyroid Focus or GLP Optimization.

The most useful case is a man on or considering testosterone therapy, since the Endocrine Society weighs PSA before starting treatment; Hormone Focus covers testosterone, estradiol, SHBG and PSA in one draw. If you are thinking of using a home test for prostate cancer screening, talk to your doctor first, because an abnormal result leads to the same follow-up tests either way. SiPhox does not include a doctor review (see our SiPhox review), so share your results with your own clinician. Men can compare kits in our at-home testosterone test guide.

A note on home samples: SiPhox's partner lab tests capillary blood collected from the upper arm. SiPhox says its results show a 95% to 99% correlation with venous draws in its own quarterly comparisons against Labcorp and Quest, but it has not published a study of the EasyDraw device. If a result would change a treatment decision, confirm it with a venous test through your doctor.

Hormone Focus

$124 + $25 shipping per test

14 biomarkers per test

Sex hormones for men and women, including PSA for men and progesterone for women.

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Ultimate 360

$249 + $25 shipping per test

62 biomarkers per test

Everything on the four core panels plus iron studies, B12 and folate, GGT and PSA.

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