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Quantitative Detection of Specific DNA Sequences in Plasma by Probe-Based Assay

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

This test measures the presence and quantity of specific genetic material (DNA) in your blood plasma using a specialized probe. It may be used to detect certain genetic markers, mutations, or viral DNA associated with conditions like infections or genetic disorders.

Quick summary

["This test helps identify specific DNA sequences that may indicate underlying health concerns or responses to treatments."]

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

Key facts at a glance

LOINC
92800-2
Short code
C tropicls DNA Bld Pos Ql NAA+probe
Synonyms
C tropicls 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 uses a molecular probe to detect and quantify particular DNA sequences in your plasma. These sequences could be from viruses, bacteria, or genetic material linked to specific health conditions. The probe binds to matching DNA fragments, allowing precise measurement of their concentration.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms or risk factors for conditions like chronic infections (e.g., hepatitis, HIV), genetic disorders, or monitoring treatment effectiveness for conditions involving genetic material.

Common Uses and Conditions

This test is often used in research or specialized clinical settings to detect viral DNA (e.g., HIV, hepatitis B or C), monitor genetic mutations, or assess immune responses. It may also be part of broader diagnostic workups for suspected hereditary conditions.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The blood is processed to separate plasma, which is then analyzed for the target DNA sequences. The test does not require fasting or special preparation beyond standard blood draw procedures.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DNA Probe Test (Plasma)

Frequently asked questions

What does a positive or negative result mean?
A positive result indicates the presence of the targeted DNA sequences, which may suggest an infection, genetic predisposition, or other underlying condition. A negative result means the specific DNA sequences were not detected in this sample, but further testing or follow-up may still be needed.
How long will I need to wait for results?
Results may take several days to a few weeks, depending on the laboratory’s processing schedule and complexity of the test. Your healthcare provider will contact you once results are available.
Are there any risks or side effects from this test?
The blood draw itself carries minor risks like bruising, slight pain, or swelling at the injection site. There are no known side effects from the DNA probe assay itself, but rare allergic reactions to lab processes are possible. Always discuss any concerns with your provider.
  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