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Human Herpesvirus 7 (HHV-7) DNA in Blood (Quantitative)

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

This test measures the amount of genetic material from HHV-7, a type of virus that can sometimes be present in your blood.

Quick summary

["Understanding your HHV-7 DNA levels may help assess viral activity or guide certain follow-up care."]

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

Key facts at a glance

LOINC
49398-1
Short code
HHV7 DNA # Bld NAA+probe
Synonyms
HHV7 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 This Test Is Done

Doctors may order this test if you have symptoms or conditions linked to viral infections, such as persistent fatigue, fever, or immune system concerns. It can also be part of monitoring for people with weakened immune systems or those undergoing treatments that affect viruses.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The test looks for HHV-7 DNA in your blood cells.

What the Results Mean

Results show whether HHV-7 DNA is detected and, if so, its approximate quantity. Higher levels may indicate active viral presence, but this doesn’t always mean you’re sick. Results are used alongside clinical judgment and other tests.

Common Reasons for Testing

This test may be used to investigate unexplained symptoms, evaluate immune function, or monitor viral load in certain medical conditions. It’s not typically a routine screening test for healthy individuals.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HHV-7 DNA Blood Test

Frequently asked questions

What does a positive result mean?
A positive result means HHV-7 DNA was found in your blood. This doesn’t always mean you’re sick, but it may signal the virus is active. Your doctor will consider your symptoms, medical history, and other test results to interpret the significance.
How does this test differ from other viral tests?
Unlike tests for antibodies (which show past exposure) or symptoms, this test directly measures the virus’s genetic material. It helps identify active infection rather than just past exposure.
Can this test be used for treatment decisions?
Sometimes, doctors use these results to guide treatment plans, especially in people with immune issues or those taking antiviral medications. However, results alone don’t determine treatment—your doctor will weigh them with other factors.
  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