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Dried Blood Spot (DBS) DNA Analysis for Genetic Testing via Probe-Based Assay

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

This test involves collecting a small blood sample dried on a card to analyze your DNA for specific genetic markers. It helps identify potential genetic conditions or variations that may influence health risks.

Quick summary

["This test checks for specific DNA sequences that could relate to inherited conditions or genetic traits."]

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

Key facts at a glance

LOINC
70071-6
Short code
S constellatus DNA Spec Ql NAA+probe
Synonyms
S constellatus DNA Spec Ql NAA+probe
Category
coagulation
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

How the Test Works

A tiny blood sample is collected and placed on a special card that dries quickly. This card is then sent to a lab for DNA extraction and analysis using a probe-based method. This method detects specific DNA sequences that match the genetic markers of interest.

What to Expect Before the Test

You may need to fast for a short period before the test, depending on the specific instructions from your healthcare provider. Bring any medications you’re currently taking, as some may affect results. Avoid heavy exercise or alcohol before the procedure.

Common Uses of This Test

This test is often used for genetic screening, carrier testing, or diagnosing conditions linked to specific DNA variations. It may also be used in prenatal testing, carrier screening for inherited disorders, or research studies.

Potential Risks and Considerations

The blood collection process is quick and minimally uncomfortable. There’s a very small risk of bruising or slight pain at the needle site, but complications are rare. Results may take several days to weeks, depending on lab processing times.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

Why might my doctor recommend this test?
Your doctor may suggest this test if you have a family history of genetic disorders, are considering pregnancy, or if they suspect a genetic condition based on symptoms or lab findings. It can help identify risks for conditions like cystic fibrosis, muscular dystrophy, or other hereditary diseases.
What does a positive or negative result mean?
A positive result indicates the presence of specific genetic markers that may increase your risk for certain conditions. This doesn’t always mean you’ll develop the disease, but it may guide treatment or preventive measures. A negative result means those markers were not detected in this sample.
How often should I get this test?
Genetic testing is typically done once unless there’s a change in your health status, family history, or medical advice suggests retesting. Follow your healthcare provider’s recommendations for follow-up.
  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