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Genetic analysis of serum or plasma for specific DNA sequences (qualitative probe-based test)

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

This test checks for specific DNA changes (mutations) in your blood sample using a genetic probe. It helps identify whether certain genes are altered in a way that may affect health.

Quick summary

["Determines if a known genetic variation is present in your blood, which may influence disease risk or treatment options."]

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

Key facts at a glance

LOINC
71787-6
Short code
S aureus etb gene Spec Ql NAA+probe
Synonyms
S aureus etb gene Spec Ql 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 uses a specialized probe to detect specific DNA sequences in your serum or plasma. These sequences may represent known mutations linked to inherited conditions, cancer risks, or other genetic factors. The probe binds to matching DNA fragments if present, allowing for qualitative confirmation.

How the Test Works

Blood is drawn and processed to isolate serum or plasma. The genetic material is then analyzed using a molecular technique that identifies the presence of targeted DNA sequences. Results are reported as either positive (mutation detected) or negative (mutation not found).

Common Uses

This test may be used for pre-symptomatic screening, genetic counseling, cancer risk assessment, or guiding personalized treatment plans where specific gene mutations are clinically relevant.

Preparation

No special preparation is typically required, but you may be asked to fast for 8–12 hours before your blood draw if instructed by your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Gene Mutation Screening (Serum/Plasma)

Frequently asked questions

Why might I need this test?
Your doctor may recommend this test if you have a family history of genetic conditions, are at high risk for certain cancers, or if you’re undergoing genetic counseling for a known genetic mutation.
What does a positive result mean?
A positive result means the specific mutation was detected in your DNA. This finding may require further evaluation by a genetic specialist to assess implications for your health and future care.
Are there any risks or side effects?
The most common risk is mild discomfort from the blood draw, such as bruising or swelling at the site. Genetic testing itself carries no physical risks, but results may influence future medical decisions.
  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