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Prostate-Specific Antigen (PSA) in Fluid (Microfluidic Analysis)

Published: August 9, 2026Updated: August 17, 2026

This test measures prostate-specific antigen (PSA), a protein produced by both normal and cancerous prostate cells, in a fluid sample. It may be used to assess prostate health or guide further evaluation.

Quick summary

["PSA fluid testing helps monitor prostate conditions by analyzing fluid from the prostate gland."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
96719-0
Short code
RBC #/area Prost fld Micro
Synonyms
RBC #/area Prost fld Micro
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
4.2
Ref high
5.9
Critical range
2 N/A – 7 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
CPT
85041
SNOMED
900000000000003001
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

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like urinary issues, pain in the pelvic area, or if you’re at higher risk for prostate problems. It could also be part of a broader evaluation for prostate health, especially if you’re experiencing changes in PSA levels in other tests.

What to Expect Before the Test

No special preparation is typically needed, but you may be asked to avoid ejaculation for a few days before the test. Your provider will guide you on any specific instructions based on your situation.

What the Test Involves

A small sample of fluid from the prostate may be collected using a procedure called a transrectal ultrasound-guided aspiration or biopsy. The fluid is then analyzed in a lab to measure PSA levels.

What the Results Mean

Results show the concentration of PSA in the fluid sample. While PSA levels alone don’t confirm prostate cancer, they can help identify abnormalities that may need further investigation, such as additional imaging or biopsies.

Reference range

Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A

Specimen: serum

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

PSA Fluid Test

Frequently asked questions

What Does This Test Measure?
This test measures PSA levels in a prostate fluid sample, which can help assess prostate health, detect abnormalities, or guide treatment decisions. PSA is a protein that can be elevated in conditions like prostate cancer, inflammation, or benign prostatic hyperplasia (BPH).
How Is This Test Different from a Standard PSA Blood Test?
Unlike standard PSA blood tests, which measure PSA in circulation, this fluid-based test focuses on PSA directly from the prostate gland. This can provide more localized information about prostate tissue and may be useful for diagnosing or monitoring prostate-specific issues.
Can This Test Replace Other Prostate Tests?
No, this test is typically used alongside other diagnostic tools, such as digital rectal exams, imaging studies (like MRI), or additional blood tests. It serves as one piece of the puzzle in evaluating prostate health.
  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 17, 2026. · Read our editorial policy