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RNA Viral Probe for Detection in Serum/Plasma

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

This test detects genetic material from certain viruses in your blood, helping identify infections like hepatitis or other viral illnesses.

Quick summary

["Checks for viral RNA in your blood to help diagnose infections early."]

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

Key facts at a glance

LOINC
63424-6
Short code
ehlyA Spec QA PCR NAA+probe
Synonyms
ehlyA Spec QA PCR 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

This test looks for RNA sequences from specific viruses in your serum or plasma. RNA is a molecule that carries genetic information from viruses to your cells. If the test finds viral RNA, it may indicate an active viral infection.

How the Test Works

The test uses a specialized probe to detect RNA fragments from viruses. This process is highly sensitive and can identify even small amounts of viral genetic material.

Why It’s Done

Doctors may order this test to diagnose or monitor infections caused by viruses like hepatitis B or C, or other viruses depending on clinical suspicion.

Sample Collection

A blood sample is drawn from a vein in your arm. The blood is then separated to obtain serum or plasma, which is tested for viral RNA.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Viral RNA Detection (Serum/Plasma)

Frequently asked questions

What does a positive result mean?
A positive result means viral RNA was found in your blood, suggesting an active viral infection. This does not always mean you are sick yet, but it indicates the virus is present and may be multiplying.
What does a negative result mean?
A negative result means no viral RNA was detected in your blood sample at the time of testing. This could mean the infection is not active, or the virus is at very low levels.
How soon after infection can this test detect the virus?
This test can detect viral RNA within days to weeks after infection, depending on the virus. Some viruses may take longer to produce detectable RNA levels.
  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