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Genetic test for detection of specific nucleotide sequences in plasma using a probe (e.g., for hereditary conditions or genetic screening)

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

This test checks for the presence of a particular DNA sequence in your blood, often used to identify genetic predispositions or confirm suspected hereditary conditions.

Quick summary

["This test helps identify genetic variations that may influence health risks or diagnose inherited disorders."]

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

Key facts at a glance

LOINC
77577-5
Short code
CT+NG DNA Pnl Urth NAA+probe
Synonyms
CT+NG DNA Pnl Urth 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

The test detects a specific segment of your DNA (nucleotide sequence) using a molecular probe. This probe binds to the target DNA if it is present in your blood plasma. The presence of this sequence can indicate a genetic condition or trait, depending on clinical context.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have a family history of a genetic disorder, symptoms suggestive of a hereditary condition, or if you’re part of a genetic screening program. It can also be used to confirm a suspected diagnosis or monitor genetic risks.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The plasma portion of the blood is then processed and analyzed for the target DNA sequence. This test does not require fasting or special preparation beyond standard blood draw guidelines.

What to Expect During the Test

After your blood is drawn, it is sent to a lab for processing. Results are typically available within days to weeks, depending on the lab’s workflow. You’ll receive a report from your healthcare provider with detailed findings.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How long does it take to get results from this test?
Results typically take between 5 to 14 days, depending on the lab’s processing time and any additional confirmatory steps required.
What does a positive result mean?
A positive result indicates the presence of the specific DNA sequence being tested for. This may suggest a genetic predisposition to a condition or confirm a suspected hereditary disorder. Your healthcare provider will discuss the implications with you based on clinical context.
Can this test be used for routine health checks?
No, this test is generally not used for routine health screening. It is typically ordered for specific genetic concerns, family history, or clinical indications related to hereditary conditions.
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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