Skip to content

Prostate-Specific Antigen (PSA) Level by Immunoassay (Qualitative Probe)

Published: August 9, 2026Updated: August 16, 2026

This test measures prostate-specific antigen (PSA), a protein produced by the prostate gland, using a qualitative immunoassay probe. It helps assess potential prostate health concerns, including inflammation or cancer.

Quick summary

["A PSA test may help guide discussions about prostate health, though results alone don’t diagnose conditions."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
85797-9
Short code
N men sg DNA Pnl Spec NAA+probe
Synonyms
N men sg DNA Pnl Spec NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

PSA is a protein found in higher amounts in prostate tissue. The immunoassay probe detects PSA in a sample to determine its presence or concentration qualitatively (yes/no). This method is often used as a screening or initial probe for prostate-related evaluations.

Why It’s Done

Doctors may order this test to check for prostate issues, such as inflammation (prostatitis), benign prostatic hyperplasia (BPH), or prostate cancer. It’s sometimes used alongside other tests or clinical findings for further evaluation.

Sample Collection and Preparation

A blood sample is typically drawn from a vein in your arm. The test uses a qualitative probe to detect PSA without providing a specific numeric value, so no further processing is required beyond standard blood collection.

What to Expect Before the Test

No special preparation is needed unless instructed by your healthcare provider. Avoiding certain medications or dietary restrictions may be advised, but this is rare for qualitative PSA probes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

While PSA levels can indicate prostate health, qualitative results alone are not definitive. They are often used as part of a broader evaluation, including physical exams, imaging, or further testing. Elevated PSA may signal concern, but other factors (like age, race, or prostate size) can influence results.

Short name

PSA Qualitative Probe

Frequently asked questions

What does a positive (qualitative) PSA result mean?
A positive result means PSA was detected in the sample, suggesting it may be present in the prostate or related tissues. This doesn’t confirm a diagnosis but may prompt additional testing or discussions with your doctor.
Can PSA levels change over time?
Yes, PSA levels can fluctuate due to factors like prostate inflammation, infections, or medical treatments. Qualitative tests don’t show changes over time, so follow-up testing with your doctor is important for monitoring.
Is this test covered by insurance?
Coverage depends on your insurance plan and clinical indication. Check with your provider or insurance company to confirm if this qualitative PSA probe is included in your benefits, especially if ordered for screening or diagnostic purposes.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy