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SARS-CoV-2 (COVID-19) Nucleic Acid Test (Qualitative, Plasma)

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

This test detects genetic material from the virus that causes COVID-19 in your blood plasma. It helps determine if you have an active infection.

Quick summary

["A COVID-19 PCR test in plasma can confirm if you have an active virus, even if symptoms are mild or absent."]

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

Key facts at a glance

LOINC
96121-9
Short code
SARS-rel CoV E gene Low resp Ql NAA+prb
Synonyms
SARS-rel CoV E gene Low resp Ql NAA+prb
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

How the Test Works

The test uses a specialized probe to identify the virus’s genetic material (RNA) in your plasma. If the virus is present, the test detects it through a process called polymerase chain reaction (PCR), amplifying and confirming its presence for analysis.

What to Expect Before the Test

No special preparation is needed. You may receive instructions to fast or avoid certain medications, but this is rare for plasma-based tests. Your healthcare provider will guide you on timing for optimal results.

Sample Collection and Processing

A blood sample is drawn from your vein, and plasma is separated from the blood cells. This plasma is then analyzed for viral genetic material in a lab setting.

When Results Are Needed

Results are typically available within 24–72 hours, depending on lab processing times. Your healthcare provider will contact you with the outcome.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results indicate an active COVID-19 infection and may guide treatment decisions, isolation recommendations, or contact tracing. Negative results suggest no detectable virus, but they do not rule out infection if symptoms persist or testing was done too early.

Short name

COVID-19 PCR Test (Plasma)

Frequently asked questions

Why was I asked to provide plasma instead of blood?
Plasma is often preferred for detecting viral genetic material because it contains higher concentrations of the virus’s RNA. Plasma testing may also be more sensitive for some patients, especially those with lower blood cell counts.
Can I still get COVID-19 if my test is negative?
Yes, a negative test does not guarantee you are not infected. The virus may not yet be detectable, or testing could be done too early in the infection. Stay vigilant with precautions if you’ve been exposed.
What if my test is positive but I don’t have symptoms?
A positive test without symptoms means you may still be contagious, even if you feel well. Follow your healthcare provider’s advice for next steps, such as isolation or monitoring.
  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