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Respiratory Viral RNA Detection by Probe-Based Assay (Serum/Plasma)

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

This test checks for the presence of viral RNA in your blood, often used to diagnose infections caused by viruses like respiratory viruses.

Quick summary

["Helps identify viral infections in your bloodstream that may require medical attention."]

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

Key facts at a glance

LOINC
16585-2
Short code
C pneum rRNA SerPl Ql Probe
Synonyms
C pneum rRNA SerPl Ql 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
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 detects genetic material (RNA) from certain viruses in your serum or plasma. It’s not a measure of virus activity or your immune response but confirms if the virus is present in your blood.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like fever, cough, or fatigue that suggest a viral infection, especially if you’ve been exposed to respiratory viruses.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. The blood is processed to separate serum or plasma, which is then tested for viral RNA using a specialized probe-based method.

What to Expect Before the Test

No special preparation is needed. You may have some mild discomfort from the needle, but it usually goes away quickly. Avoid alcohol or certain medications for 24 hours before testing if instructed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Viral RNA Probe Test (Serum/Plasma)

Frequently asked questions

Can this test detect all viruses?
This test specifically detects RNA from certain respiratory viruses, but it may not cover all possible viruses. Your healthcare provider will explain which viruses are being checked based on your symptoms and clinical needs.
What does a positive result mean?
A positive result means viral RNA was found in your blood, suggesting an active infection. This does not always mean you are contagious or that you will develop symptoms, but it warrants further medical evaluation.
How soon will I get my results?
Results are typically available within 24 to 48 hours, depending on lab processing times. Your healthcare provider will contact you with the results and any next steps.
  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