What Is the PSA Test?

What Should the PSA Level Be, and What Does a High Level Mean?

What Is the PSA Test?

The PSA test is one of the most important blood tests used to evaluate prostate diseases. PSA stands forProstate-Specific Antigen,a protein produced by cells in the prostate gland. PSA normally helps liquefy semen, and only a very small amount enters the bloodstream.

Measuring PSA levels in the blood is helpful, particularly in the evaluation of conditions such asprostate cancer screening,benign prostatic hyperplasia (BPH), andprostate inflammation (prostatitis).

As Prof. Dr. Volkan İzolhas often emphasized, the PSA test alone is not sufficient to determine whether “cancer is present” or “cancer is absent”; it must always be evaluatedin conjunction with clinical findings and other tests.

Why Is PSA Measured?

The PSA test is performed for the following purposes:

  • Prostate Cancer Screening
  • Follow-up of Patients with Benign Prostatic Hyperplasia
  • Follow-up after prostate cancer treatment
  • Further Evaluation Following a Suspicious Prostate Examination
  • Early screening for men with a family history

Especially in early-stage prostate cancer cases that do not present symptoms, the PSA test plays a critical rolein the early detection ofthe disease.

How Is the PSA Test Performed?

The PSA test is a fairly simple blood test.

  • It usually doesn't matter whether you're hungry or full
  • It is measured using a blood sample taken from a vein in the arm
  • Results are usually available the same day or the next day

📌 However, there are certain conditions that can affect PSA levels. For this reason, there are some points to keep in mind before the test.

What Should You Keep in Mind Before a PSA Test?

Conditions that can temporarily raise PSA levels include the following:

  • Sexual intercourse or ejaculation within the last 48 hours
  • Prostate Exam
  • Insertion of a urinary catheter
  • Urological procedures such as cystoscopy
  • Active urinary tract infection
  • Cycling for a long time

For this reason, before taking a PSA test:

  • Avoid sexual intercourse for the past 2 days
  • If there is an active infection, it is recommended to postpone the test
    .

What Should the PSA Level Be? (Normal PSA Levels)

There is no single “normal” PSA level. Since prostate volume increases with age, PSA levels also vary depending on age.

PSA Reference Ranges by Age

  • Ages 40–49:0–2.5 ng/mL
  • Ages 50–59:0–3.5 ng/mL
  • Ages 60–69:0–4.5 ng/mL
  • Ages 70 and older:0–6.5 ng/mL

📌 These valuesrepresent generally accepted ranges. However, each patient should be evaluated on a case-by-case basis.

Prof. Dr. Volkan İzol specifically notes thatthe change in PSA levels over time (PSA velocity)may be clinically more meaningful than the PSA level itself.

What Does an Elevated PSA Level Mean?

There is a common misconception in society:

“If your PSA is high, you definitely have cancer.”

👉 That is not true.

Elevated PSA levels can be caused by many factors.

The Most Common Causes of Elevated PSA Levels

🔹 Benign Prostatic Hyperplasia (BPH)

As prostate volume increases, PSA levels may also rise.

🔹 Prostatitis (Inflammation of the Prostate)

PSA levels may rise significantly in cases of acute or chronic prostatitis.

🔹 Prostate Cancer

Elevated PSA levels are one of the most important biochemical markers of prostate cancer; however, they are not sufficient on their own to establish a diagnosis.

🔹 Urological Procedures

PSA levels may temporarily rise after procedures such as a biopsy or cystoscopy.

What Does a Low PSA Level Mean?

A low PSA levelis generallya good sign, but it does not mean you are 100% safe.

  • Can prostate cancer occur with a low PSA level?
    👉 Rarely, yes.

Therefore, even if the PSA level is low:

  • If there is a family history
  • If there is any doubt during the digital rectal exam

Further evaluation may be necessary.

What Is the PSA Free/Total Ratio?

PSA is found in the blood in two forms:

  • Total PSA
  • Free PSA

The free PSA/total PSA ratio is helpful in differential diagnosis, particularly in patients with PSA levels between4 and 10 ng/mL.

  • If the ratio is low:The risk of cancer is higher
  • If the rate is high:Benign causes are more likely

What Should You Do If Your PSA Level Is High?

If elevated PSA levels are detected, there is no need to panic right away.

The steps to follow are as follows:

  1. PSA is repeated
  2. A digital rectal exam is performed
  3. PSA kinetics are evaluated
  4. If necessary, a multiparametric prostate MRI is performed
  5. If there is any suspicion, a prostate biopsy is scheduled

Prof. Dr. Volkan İzol’sapproach emphasizes that not every elevated PSA level warrants a biopsy and that unnecessary biopsies should be avoided.

The Relationship Between PSA and Prostate Cancer

PSA is a test that has revolutionized the early diagnosis of prostate cancer. Thanks to PSA:

  • Cancer can be detected in its early stages
  • A disease confined to a single organ can be detected
  • The chances of a cure increase

However, PSAis not cancer-specific. For this reason, in the modern approach, PSA, MRI, and clinical evaluation are considered together.

Who Should Undergo PSA Testing?

Groups for Which PSA Screening Is Recommended

  • All men over the age of 50
  • People with a family history of prostate cancer (as of age 40–45)
  • Men of African descent
  • Those with a history of prostate disease

Annual or biennial PSA monitoring is scheduled based on the risk group.

Why Is Post-PSA Treatment Important?

PSA monitoring is of vital importance for patients who have undergone surgery or radiation therapy for prostate cancer.

  • PSA is expected to be close to zero
  • A rise in PSA levels is a warning sign of a recurrence of the disease

For this reason, regular PSA monitoring indicates the success of treatment.

Is the PSA Test Reliable?

PSA test:

  • It is a sensitivetest
  • However,its specificity is limited

In other words, it detects many cases, but not every case it detects is cancer. For this reason, PSA should not be used on its own but as part ofa sensible and comprehensive evaluation.

Frequently Asked Questions About PSA

Does a high PSA level definitely mean cancer?

No.

My PSA is normal, but could I still have cancer?

Rarely, yes.

Are there any medications that lower PSA levels?

Some prostate medications can lower PSA levels; this should always be reported to your doctor.

Do plant-based products lower PSA levels?

There is no scientifically proven, reliable method.

Conclusion

The PSA test is avery valuabletool for the early diagnosis and monitoring of prostate diseases,but it is not sufficient on its own. When performed at the right time, on the right patient group, and interpreted correctly, it can be life-saving.

In the modern approach, which Prof. Dr. Volkan İzolalso endorses, PSA is evaluated in conjunction with the patient’s medical history, physical examination, and advanced imaging methods to makepersonalized decisions.