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Human Herpesvirus 6 (HHV-6) DNA in Whole Blood by Nucleic Acid Probe

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

This test detects genetic material (DNA) from Human Herpesvirus 6 in your blood. It helps identify if the virus is actively present, which can be useful in certain medical evaluations.

Quick summary

["This test checks for active HHV-6 infection in your bloodstream."]

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

Key facts at a glance

LOINC
49391-6
Short code
HHV6 DNA # Bld NAA+probe
Synonyms
HHV6 DNA # Bld 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

Why Might This Test Be Ordered?

Your healthcare provider may recommend this test if you have symptoms or conditions linked to HHV-6, such as severe or persistent fever, neurological issues, or immune system problems. It may also be used to monitor patients undergoing certain treatments, like stem cell transplants, where infections can be more dangerous.

What Does a Positive Result Mean?

A positive result indicates the presence of HHV-6 DNA in your blood, suggesting active infection. This doesn’t always mean you’re sick right now, but it confirms the virus is present. Further evaluation by your doctor will help determine next steps, such as treatment or monitoring.

What Does a Negative Result Mean?

A negative result means no detectable HHV-6 DNA was found in your blood sample at the time of testing. This could mean the virus isn’t actively replicating, but it doesn’t rule out past infection or a low-level presence that wasn’t detected.

Sample Collection and Preparation

This test uses a blood sample collected from a vein. A healthcare professional will insert a small needle into your arm to draw blood. The blood is then processed to extract DNA for testing. No special preparation is needed, but avoid vigorous exercise or eating heavy meals before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HHV-6 DNA Test

Frequently asked questions

How is this test used in clinical practice?
This test is primarily used to diagnose or monitor active HHV-6 infections, especially in immunocompromised individuals or those undergoing treatments that weaken the immune system. It can also help assess the effectiveness of antiviral therapies or guide decisions about further medical interventions.
What are the typical reference ranges?
Reference ranges for HHV-6 DNA tests vary by lab and testing method. Since this is a qualitative probe-based test, results are typically reported as either positive (detectable DNA) or negative (no detectable DNA). Quantitative ranges are not provided as they depend on the specific assay sensitivity.
Can this test detect past infections?
No, this test specifically detects active HHV-6 DNA in your blood. It cannot confirm past infections or latent virus presence without additional testing, such as antibody tests.
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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