Guide to PSA, Total

WRITTEN BY

The Levels Team

Updated: 05/22/2025|12 min read

Summary

Prostate-specific antigen (PSA) is a protein produced almost exclusively by the prostate gland. PSA is primarily released into seminal fluid, where it helps liquefy semen after ejaculation, but small amounts also enter the bloodstream.

Why It Matters

In a healthy prostate, only small amounts of PSA leak into the bloodstream, resulting in low levels. However, when the prostate is irritated, inflamed, enlarged, or affected by cancer, more PSA enters the bloodstream, causing elevated levels.

PSA became widely used as a screening test for prostate cancer in the 1990s, dramatically increasing early detection. However, PSA testing has limitations. It's specific to the prostate but not to cancer---levels can rise due to benign (noncancerous) conditions like prostate inflammation (prostatitis), benign enlargement (BPH), recent ejaculation, or even after certain medical procedures. Additionally, some aggressive prostate cancers may not cause significant PSA elevations.

Because of these complexities, total PSA is now often evaluated alongside other factors: how quickly PSA is rising over time (PSA velocity), the ratio of free to total PSA (with lower percentages of free PSA potentially indicating higher cancer risk), PSA density (PSA relative to prostate size), and age-adjusted PSA ranges.

The significance of elevated PSA varies by individual circumstances. For some men, it might prompt a prostate biopsy to check for cancer. For others, especially older men with limited life expectancy and minimally elevated PSA, careful monitoring might be recommended instead. 

Associated Symptoms

PSA levels themselves are laboratory findings rather than medical conditions. However, elevated levels may be associated with various prostate conditions, each with its own symptoms.

Common symptoms that may indicate conditions associated with elevated PSA due to benign prostatic hyperplasia (BPH):

• Difficulty starting urination: Enlarged prostate tissue restricting urine flow at the bladder outlet
• Weak urine stream: Reduced force of urination may be due to increased urethral resistance
• Feeling of incomplete bladder emptying: Residual urine remaining after voiding may be due to bladder weakness
• Frequent urination: Particularly at night (nocturia), potentially resulting from reduced bladder capacity and irritation
• Urgent need to urinate: Bladder irritation, potentially resulting from pressure caused by obstruction

Common symptoms that may indicate conditions associated with elevated PSA due to prostatitis (prostate inflammation):

• Pain or burning during urination: Inflammation of prostatic tissue puts pressure on the urethra
• Pelvic discomfort: Pain in the groin, pelvis, or lower back, potentially resulting from inflamed prostate tissue
• Pain during ejaculation: Can result from irritation of inflamed tissues during contraction of the perineum
• Flu-like symptoms: Fever, chills, and body aches can occur in cases of acute bacterial prostatitis

Common symptoms that may indicate conditions associated with elevated PSA due to prostate cancer:

• Early stages: Often no noticeable symptoms, which is why screening is important
• Advanced stages: May include difficulty urinating, blood in urine or semen, erectile dysfunction, bone pain (if cancer has spread), and unexplained weight loss

It's important to understand that many men with elevated PSA may experience no symptoms at all, particularly in early-stage prostate cancer or mild BPH. Conversely, men with normal PSA levels may still experience urinary symptoms due to other conditions affecting the lower urinary tract. The presence of symptoms alongside elevated PSA provides context for further investigation, but additional testing is typically needed to determine the underlying cause.

Clinical Ranges

Lab Reference Range: ≤4.0 ng/mL

Lifestyle Factors That Can Impact It

Activities that may temporarily increase PSA include the following:

• Vigorous exercise, especially cycling (for 24--48 hours) 
• Recent urinary tract infection
• Diet high in animal fats (may be associated with higher PSA long term)

Activities that may lower prostate cancer risk include the following:

• Regular ejaculation 
• Regular exercise 

Other Factors That Can Impact It

Medical Conditions

• Benign prostatic hyperplasia (BPH): Increases PSA through prostate enlargement, leading to more PSA-producing tissue and disruption of the normal prostate architecture
• Prostatitis (inflammation): Raises PSA by increasing PSA leakage into the bloodstream due to inflammatory breakdown of prostate cellular barriers
• Urinary tract infection: Can elevate PSA by causing inflammation or irritation in the prostate or nearby tissues, which increases PSA leakage into the bloodstream, similar to prostatitis.
• Prostate cancer: Increases PSA to varying degrees depending on cancer volume, aggressiveness, and whether it has spread beyond the prostate
• Urinary retention: Can increase PSA through pressure effects and irritation of the prostate

Medications and Procedures

• 5-alpha reductase inhibitors (finasteride, dutasteride): Decrease PSA through reduction of prostate volume
• Digital rectal examination: Can increase PSA for 2--3 days through physical pressure on the prostate
• Prostate biopsy: Dramatically raises PSA for 4--6 weeks through direct trauma to the prostate tissue
• Cystoscopy (bladder examination): May increase PSA for 1-2 days through instrumentation near the prostate
• Prostate surgery: Causes significant PSA increases initially, followed by eventual decreases as prostate tissue is removed
• Testosterone therapy: May increase PSA through effects on prostate tissue growth

Testing Accuracy and Stability

PSA testing is generally reliable. But several factors can affect the accuracy of your results, potentially leading to values that don't truly reflect your prostate health status.

Factors That Can Affect the Accuracy of Your Test

• Recent ejaculation increases measured PSA for 24--48 hours. It's advisable to abstain for 2--3 days before testing for the most accurate results.
• Prostate manipulation through a digital rectal examination, prostate massage, or bicycle/motorcycle riding raises PSA for 2--3 days by forcing more PSA into the bloodstream.

How It Relates to Other Markers

Other tests can provide insights about health status when they're viewed alongside total PSA results. These tests may include:

• Free PSA percentage: This test measures the proportion of PSA that is not bound to proteins. Lower free PSA percentages are associated with higher prostate cancer risk at a given total PSA level.
• PSA velocity: This test measures the rate of change in PSA over time. 
• PSA density: This marker is calculated by dividing the PSA level by prostate volume (measured by ultrasound or MRI). Higher densities (>0.15 ng/mL/cc) can suggest higher cancer risk, as cancerous tissue tends to produce more PSA per volume than benign tissue.
• Prostate health index (PHI): This is a calculated value based on total PSA, free PSA, and a precursor form of PSA called [-2]proPSA. It provides better discrimination between cancer and benign conditions.
• Digital rectal examination (DRE): An abnormal DRE with elevated PSA significantly increases cancer risk.
• Age: PSA naturally increases with age due to prostate enlargement. Age-adjusted reference ranges help with interpretation.

What Results May Mean in the Context of Other Markers

• Elevated PSA with low free PSA percentage: May suggest higher risk of prostate cancer---at PSA levels of 4-10 ng/mL, free PSA < 10 percent is associated with about a 50-60 percent cancer risk (though it varies by age), while free PSA >25 percent has < 10 percent cancer risk ( for men 50-59, varies by age.
• Elevated PSA with normal DRE: Could indicate early cancer or benign conditions---further evaluation often warranted through additional testing or monitoring.
• Normal PSA with abnormal DRE: Requires further evaluation as some aggressive cancers produce little PSA
• Elevated PSA with high PSA density: May be more concerning for cancer---benign enlargement typically produces less PSA per volume of tissue than cancer.
• Mildly elevated PSA that remains stable over years: May be less concerning for significant cancer---most cancers show progressive PSA increases over time.

Follow-up Considerations

If total PSA is abnormal, your provider may make some of the following recommendations. You should always speak to your doctor if you have medical questions or before making medical decisions.

When Re-Testing May be Appropriate

• Will vary based on circumstances and your provider's guidance.

Additional Testing or Monitoring Your Doctor May Consider

• PCA3 (prostate cancer gene 3) urine test
• EXO-DX urine-based exosome test
• 4Kscore or SelectMDx tests
• MRI of the prostate
• Transrectal ultrasound
• Prostate biopsy
• Genetic risk assessment for certain men

When Additional Care May be Warranted

• PSA >10 ng/mL
• Rapid PSA doubling time (< 12 months)
• PSA velocity >0.75 ng/mL per year
• Very low free PSA percentage (< 10 percent)
• Abnormal digital rectal examination with any PSA elevation
• Any detectable PSA after radical prostatectomy
• Rising PSA after cancer treatment
• Family history of aggressive prostate cancer with elevated PSA
• Symptoms of advanced prostate cancer (bone pain, weight loss)
• Urinary symptoms with elevated PSA requiring evaluation

Bibliography