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Genomic DNA Bacterial Detection by Probe (Qualitative)

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

This test checks for the presence of bacterial DNA in your blood sample using a specialized probe. It helps identify if bacteria are likely causing an infection.

Quick summary

["A simple blood test to detect possible bacterial infections through DNA analysis."]

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

Key facts at a glance

LOINC
92769-9
Short code
GN bact DNA Bld Pos Ql NAA+probe
Synonyms
GN bact DNA Bld Pos Ql NAA+probe
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects bacterial genetic material (DNA) in your blood. A positive result suggests the presence of bacteria, which may indicate an infection. This is not a test for the specific type of bacteria but confirms their presence.

How the Test Works

A small blood sample is taken and analyzed using a molecular probe. The probe binds to bacterial DNA if it is present, allowing the lab to detect infection without identifying the exact bacteria.

When You Might Need This Test

Your healthcare provider may order this test if you have symptoms of infection (such as fever, chills, or signs of sepsis) and other tests (like blood cultures) are inconclusive or negative.

Possible Results and Next Steps

A positive result means bacterial DNA was found, which may prompt further testing (like blood cultures) or treatment for infection. A negative result means no bacterial DNA was detected, but other causes of symptoms should still be evaluated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Bacterial DNA Probe Test

Frequently asked questions

Why might my doctor want to use this test?
This test is useful when traditional blood cultures take too long to return results or when bacteria are suspected but not clearly identified. It helps quickly rule out bacterial infections in patients with suspected sepsis or other serious infections.
What does a positive result mean?
A positive result indicates the presence of bacterial DNA, which strongly suggests an active bacterial infection. Your doctor will work with you to determine the best treatment, which may include antibiotics.
Can this test replace blood cultures?
No, this test does not replace blood cultures. While it detects bacterial DNA, it does not identify the specific bacteria. Blood cultures are still needed to confirm the type of bacteria and guide antibiotic treatment.
  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