PSA Free and Total Biomarker Testing
It measures total PSA and the percent that is free to refine prostate risk when PSA is borderline—order through Vitals Vault with Quest labs.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
A PSA Free and Total test is a blood test that helps you and your clinician interpret a PSA (prostate-specific antigen) result with more nuance. Instead of giving only a single “PSA number,” it also reports how much of that PSA is circulating in a free (unbound) form.
This extra detail is most useful when your total PSA is in a borderline range, or when you are trying to decide what to do next after an unexpected PSA result. It does not diagnose prostate cancer on its own, but it can help guide whether repeat testing, imaging, or referral makes sense.
Because PSA can rise for reasons that are not cancer, the best interpretation comes from combining your result with your age, prostate size, symptoms, medications, and recent activities that can temporarily raise PSA.
Do I need a PSA Free and Total test?
You may consider a PSA Free and Total test if your total PSA is elevated or borderline and you want a clearer sense of whether the elevation is more likely to be from benign causes (like benign prostatic hyperplasia, BPH) versus something that needs faster follow-up. Clinicians often use percent free PSA to help decide whether to repeat PSA, monitor trends, or move toward additional evaluation.
This test can also be helpful if you have urinary symptoms such as a weak stream, frequent nighttime urination, urgency, or difficulty starting urination, especially if you are also trying to understand whether prostate enlargement might be contributing. It can add context when symptoms and PSA do not seem to match.
You may not need free PSA if your total PSA is clearly low and stable over time, or if your clinician is already using other tools (such as MRI or prior biopsy history) to guide next steps. If you are being treated for prostate cancer, your care team may prioritize total PSA trends and other cancer-specific monitoring rather than percent free PSA.
Testing is most useful when it supports clinician-directed decisions. A single PSA result should not be used for self-diagnosis, and follow-up planning should be based on your full clinical picture.
PSA testing is performed in CLIA-certified laboratories; results support screening and monitoring decisions but are not a standalone diagnosis of prostate cancer.
Lab testing
Order labs to measure PSA, Free and Total
from $59.99 at Quest Diagnostics
About 1 week
Schedule online — results typically within a week
Clear next steps
Guidance included, with follow-up care available
HSA / FSA
Eligible for pre-tax health spending accounts
Get this test with Vitals Vault
Vitals Vault lets you order a PSA Free and Total test directly and complete your blood draw at a Quest location. This is useful if you are tracking PSA over time, confirming an unexpected result, or preparing for a clinician visit with up-to-date labs.
After you receive your results, you can use PocketMD to review what “total PSA,” “free PSA,” and “percent free PSA” typically mean, and to generate a focused list of follow-up questions for your clinician. That can be especially helpful when your total PSA is in a gray zone and the next step is not obvious.
If your result suggests you should retest, Vitals Vault makes it easy to reorder the same test so you can compare trends under similar conditions (for example, avoiding ejaculation or intense cycling before the draw). If you need broader lab context, you can add companion testing based on your situation rather than guessing.
- Order online and draw at a Quest location
- Clear, patient-friendly interpretation support with PocketMD
- Designed for repeat testing and trend tracking
Key benefits of PSA Free and Total testing
- Adds percent free PSA to help interpret a borderline or mildly elevated total PSA.
- Helps distinguish PSA elevations that are more consistent with benign prostate enlargement versus higher-risk patterns.
- Supports smarter retesting decisions by giving more context than total PSA alone.
- Can reduce unnecessary worry when total PSA is up but percent free PSA suggests a lower-risk pattern.
- Improves the quality of clinician conversations by giving you a clearer “why” behind next-step recommendations.
- Helps you track PSA changes over time with an additional signal beyond the total value.
- Pairs well with symptom review and other prostate-related tests to plan follow-up efficiently.
What is PSA Free and Total?
PSA (prostate-specific antigen) is a protein made primarily by prostate tissue. In the bloodstream, PSA exists in two main forms: PSA that is bound to other proteins (complexed PSA) and PSA that circulates on its own (free PSA).
A “total PSA” result is the sum of free PSA plus complexed PSA. The PSA Free and Total test reports total PSA, free PSA, and the percent free PSA (free PSA divided by total PSA, expressed as a percentage).
Percent free PSA is used because some prostate conditions tend to shift the balance between free and complexed PSA. In general, a lower percent free PSA can be associated with a higher likelihood that an elevated total PSA deserves closer evaluation, while a higher percent free PSA can be more consistent with benign causes. This is not a rule that replaces clinical judgment, but it can be a helpful tie-breaker when total PSA is not clearly normal or clearly high.
Why total PSA can be elevated even without cancer
PSA can rise when the prostate is larger (BPH), inflamed (prostatitis), recently manipulated (for example, catheterization or cystoscopy), or temporarily irritated. Even ejaculation and prolonged cycling can raise PSA for a short period in some people. That is why a single elevated PSA often leads to repeat testing under controlled conditions.
What “percent free PSA” is trying to answer
When total PSA is in a borderline range, percent free PSA helps estimate whether the pattern looks more like benign enlargement or more like a pattern that warrants earlier imaging or urology evaluation. Your clinician may combine this with age, prostate exam findings, family history, and PSA trend over time.
What do my PSA Free and Total results mean?
Low PSA (total and/or free)
A low total PSA is usually reassuring, especially if it is stable over time. Very low PSA does not typically indicate a health problem by itself. If you are on medications that affect PSA (such as 5-alpha-reductase inhibitors), your clinician may interpret “low” differently because the medication can lower PSA independent of prostate risk.
In-range or expected PSA pattern
An “optimal” result depends on your age and clinical context, because PSA tends to rise gradually with age and prostate size. If your total PSA is in an expected range and your percent free PSA is not concerning, clinicians often focus on routine screening intervals and watching the trend. A stable pattern across repeat tests is often more informative than any single number.
High total PSA and/or low percent free PSA
A high total PSA can happen with prostate cancer, but it can also occur with BPH, prostatitis, or recent prostate irritation. When total PSA is elevated, a lower percent free PSA can increase concern and may push the next step toward repeat testing sooner, prostate MRI, or urology referral, depending on your situation. If your PSA is newly high, many clinicians will first confirm it with a repeat test after avoiding temporary triggers and treating any suspected infection or inflammation.
Factors that influence PSA results
PSA can be influenced by age, prostate size, and recent ejaculation or vigorous cycling. Prostate infections or inflammation can raise PSA, and recent procedures involving the urinary tract or prostate can also increase it. Certain medications matter too: 5-alpha-reductase inhibitors (often used for BPH or hair loss) can lower PSA, while testosterone therapy may raise PSA in some people. Because of these variables, it helps to test under similar conditions when you are trending results over time.
What’s included
- Psa, Free
- Psa, Total
Similar tests and related markers
Frequently Asked Questions
What is the difference between total PSA and free PSA?
Total PSA is the combined amount of PSA in your blood (free PSA plus PSA bound to other proteins). Free PSA is the portion that circulates unbound. The test also reports percent free PSA, which can add context when total PSA is borderline or mildly elevated.
What does percent free PSA mean?
Percent free PSA is free PSA divided by total PSA, expressed as a percentage. In general, a lower percent free PSA can be associated with a higher likelihood that an elevated total PSA needs closer follow-up, while a higher percent free PSA can be more consistent with benign causes like BPH. Your clinician will interpret it alongside your age, symptoms, exam findings, and PSA trend.
Do I need to fast for a PSA Free and Total test?
Fasting is not usually required for PSA testing. What matters more is avoiding temporary PSA triggers before the blood draw, such as ejaculation or prolonged cycling, if your clinician recommends it. If you are combining PSA with other labs that require fasting, follow the instructions for the full panel.
What can falsely raise PSA before a blood test?
Recent ejaculation, vigorous cycling, prostatitis (inflammation or infection), urinary retention, and recent urinary tract or prostate procedures can raise PSA. Even a digital rectal exam is usually a minor factor, but some clinicians prefer drawing PSA before an exam. If your PSA is unexpectedly high, repeating the test under controlled conditions is common.
How often should PSA be retested if it is elevated?
Retest timing depends on how high the PSA is, whether you have symptoms, and whether there were possible temporary triggers. Many clinicians repeat PSA in weeks to a few months to confirm a new elevation, especially if prostatitis or recent irritation is suspected. If there is a concerning pattern, follow-up may move faster and include imaging or urology evaluation.
Does a high PSA mean I have prostate cancer?
No. PSA is a risk marker, not a diagnosis. BPH and prostatitis are common non-cancer causes of elevated PSA, and that is one reason percent free PSA and repeat testing are used to refine next steps.
Can medications affect PSA results?
Yes. 5-alpha-reductase inhibitors (often used for BPH and sometimes hair loss) can lower PSA, which can change how your clinician interprets your number. Testosterone therapy and other factors that affect prostate tissue may influence PSA as well. Always share your medication list when reviewing results.