Prostate Specific Antigen (PSA), Free
Free PSA measures the unbound form of prostate-specific antigen. The ratio of free to total PSA helps distinguish prostate cancer from benign prostate conditions when total PSA is mildly elevated.
- DHA-licensed lab
- Includes Doctor Consultation
- Physician-reviewed
- Same Day Collection
2 to 3 days
Turnaround
Blood
Sample
What the Prostate Specific Antigen (PSA), Free test tells you
Prostate-specific antigen does not travel through the blood in a single state. Some of it is bound to circulating proteins that hold it inactive, and some moves about unattached. The unattached portion is what a free PSA test measures. On its own that quantity says very little; its value comes entirely from the comparison with the total, and it is that relationship your doctor actually reads.
The reason the comparison is worth making is that benign and malignant prostate tissue tend to shift the balance in opposite directions. An enlarged but non-cancerous prostate tends to leave a greater share of the enzyme unbound, while prostate cancer is associated with a smaller unbound share. The difference is a tendency, not a rule, and the two populations overlap, so this test moves the probability rather than settling the question. Expressed the other way round: a reassuring free proportion makes benign enlargement more likely without excluding cancer, and a low free proportion raises concern without establishing anything.
Its practical place is narrow and useful. When total PSA is modestly raised and it is unclear whether tissue sampling is justified, the free fraction helps tip a decision that would otherwise be finely balanced, sparing some men a biopsy they did not need, and encouraging others to proceed. A urologist weighs it alongside the digital rectal examination, the size of the gland, your age, family history and increasingly MRI. It is one input into a judgement, and prostate cancer is still confirmed only on tissue.
Ordered alongside total PSA when values are in the 'grey zone' to improve the specificity of prostate cancer screening and reduce unnecessary biopsies.
- Clarifying a borderline result
When total PSA is modestly raised, the unbound share helps distinguish benign enlargement from cancer better than the total alone can.
- Avoiding unnecessary biopsy
A reassuring free proportion can support a decision to monitor and repeat rather than proceed straight to tissue sampling.
- Refining risk before imaging
The result feeds into the overall risk picture a urologist builds before deciding on MRI or biopsy.
- Following a watched prostate
In men under active surveillance, the free fraction is one of several measures repeated over time to detect a meaningful change.
Reasons your doctor may request the Prostate Specific Antigen (PSA), Free test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Deciding whether a biopsy is needed
- Your total PSA is modestly raised and your doctor is deciding whether a biopsy is justified.
- A previous prostate biopsy found nothing but your PSA has stayed raised.
Symptoms of an enlarged prostate
- You have symptoms of an enlarged prostate and want to know how much of the PSA rise that might explain.
Active surveillance & family risk
- You are on active surveillance for low-risk prostate disease and are being followed at intervals.
- You have a family history of prostate cancer and your doctor is building a fuller risk picture.
Your report shows a single band, Normal, 0 to 2 ng/mL, but free PSA is not read on its own. What matters is the unbound measurement expressed as a share of the total PSA from the same sample: a larger unbound share points towards benign enlargement and is reassuring, while a smaller share raises the level of concern. Neither pattern settles the question, because only tissue sampling can answer it. Several everyday things move the figure. Recent ejaculation, hard cycling, a rectal examination or catheterisation shortly before the sample can lift it, as can prostatitis or a urinary tract infection. Medicines that shrink the prostate, such as finasteride and dutasteride, alter both measurements and must be declared. The unbound form is also less stable in the tube, so delays in handling distort the comparison. Your doctor reads it with your total PSA, your examination and your symptoms.
Medically reviewed by Dr Nirupama Sabhapathy
This test is reported descriptively rather than on a numeric scale: each finding below explains what your report may say.
Interpreted as % free PSA relative to total: discuss with your physician.
Ranges are a guide: your physician interprets your result alongside your symptoms and history.
What a higher result can point to
- Benign prostatic hyperplasia, which typically leaves a larger share of the enzyme unbound.
- Prostatitis and other prostate inflammation, which lifts both the free and the total measurement.
- A urinary tract infection involving the prostate.
- Recent ejaculation, cycling, catheterisation or a rectal examination shortly before the sample.
- A simply large gland, since more prostate tissue releases more of the enzyme overall.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.
What this test cannot tell you
- Free PSA is only interpretable next to a total PSA from the same sample; the figure means little in isolation.
- The relationship between the free and total measurements shifts the probability of cancer but neither establishes nor excludes it: only tissue sampling can do that, and a raised PSA of any pattern is not a diagnosis.
- Medicines that shrink the prostate, such as finasteride and dutasteride, alter both measurements and must be declared.
- The free form is less stable in the tube than the total, so delays or poor handling between collection and analysis can distort the comparison.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 1PSA circulates both bound to proteins and unbound; this test measures the unbound part.
- 2The result is used in relation to total PSA, never as a stand-alone value.
- 3A smaller unbound share raises concern and a larger one is reassuring, but neither is a diagnosis.
- 4Prostate manipulation, infection and recent ejaculation can all disturb the measurement.
- 5Whether to test for prostate cancer at all is a choice to make with your doctor, weighing what you would do with the answer.
Prostate Specific Antigen (PSA), Free also comes in these focused packages, which pair it with the tests usually read alongside it.
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Frequently Asked Questions
Everything you need to know about the Prostate Specific Antigen (PSA), Free test. Can't find what you're looking for?
Talk to our team→Your report shows a Normal band of 0 to 2 ng/mL, but free PSA is not judged on that figure alone. What matters is the free measurement as a share of the total PSA from the same sample: a larger free share is reassuring and points towards benign enlargement, while a smaller share raises the level of concern.
PSA circulates partly bound to proteins and partly unbound. Total PSA measures both together, while free PSA measures only the unbound part. Free PSA is added when total PSA sits in a mildly raised grey zone, to help separate benign prostate conditions from cancer and avoid unnecessary biopsies.
No. A smaller free share raises the probability of cancer and can support a decision to investigate further, but it is not a diagnosis. Only tissue sampling can confirm or exclude cancer, and your urologist weighs the result with your examination, the size of the gland, your family history and any imaging.
Yes. Prostatitis and urinary infections involving the prostate lift both the free and the total measurement, which can make the result hard to read. Tell the laboratory about any recent urinary infection, and your doctor may prefer to wait until it has settled before relying on the figures.
The free form of PSA is less stable in the tube than the total, so delays or poor handling between collection and analysis can distort the comparison between them. Arrange the sample at a time when it can go straight to the laboratory, and make sure total PSA is requested on the same sample.
Because its meaning comes entirely from the comparison with the total. The same free value can be reassuring or concerning depending on the total it sits against, which is why both are measured on one sample and read together.
No. It lowers the probability, and that can reasonably change a decision about biopsy, but it does not exclude disease. Your urologist will still weigh the examination, the size of the gland, your family history and any imaging.
It tends to, but there is real overlap, and a man can have benign enlargement and cancer at the same time. That overlap is exactly why the test adjusts probability rather than sorting men into two boxes.
Yes, and you should say so. Drugs of that class lower PSA measurements substantially, so the raw figures are not read in the usual way. Your doctor adjusts the interpretation and pays particular attention to any rise while you are taking it.
No, fasting is not needed. Avoid ejaculation and vigorous cycling or horse riding for about two days beforehand, and have the blood taken before, not after, a rectal examination or other prostate procedure.
The free PSA test is AED 99, including a physician-reviewed report, with results usually within 2 to 3 days. Home collection anywhere in Dubai is free when your order reaches AED 300 or includes a package; below that, a AED 100 home collection fee applies (AED 50 for a lab walk-in).