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Streptococcus aureus detection by probe-based nucleic acid amplification test (whole blood)

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

This test checks for the presence of *Streptococcus aureus* bacteria in your blood using a genetic probe. It helps identify infections caused by this type of bacteria, which can lead to serious illnesses.

Quick summary

["Detects harmful bacteria in your bloodstream with quick, precise results for infection monitoring."]

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

Key facts at a glance

LOINC
105796-7
Short code
S aureus DNA Ct Bld Pos Qn NAA+probe
Synonyms
S aureus DNA Ct Bld Pos Qn 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

What This Test Measures

The test looks for genetic material from *Streptococcus aureus*, a type of bacteria that can cause infections in the blood, skin, or other organs. This probe-based method amplifies a small sample of your blood to detect even low levels of the bacteria.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like fever, chills, or unexplained infections, or if you’re at higher risk for *Streptococcus aureus* infections (e.g., after surgery, immune suppression, or recent trauma).

How It’s Performed

A small blood sample is taken from a vein, usually in your arm. The sample is then processed in a lab to detect bacterial DNA using a specialized probe.

What to Expect Before or After

No special preparation is needed. You may experience mild discomfort or bruising at the injection site, but this usually goes away quickly. Results are typically available within 24–48 hours.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results indicate a likely *Streptococcus aureus* infection, prompting urgent treatment with antibiotics. Negative results mean no detectable bacteria in this sample, but ongoing symptoms may still require further evaluation. This test helps guide decisions for infections like sepsis, endocarditis, or skin/soft-tissue infections.

Short name

Strep A blood test (probe-based NAAT)

Frequently asked questions

How long does it take to get results?
Results are usually ready within 24–48 hours, but timing may vary based on lab processing. Your provider will contact you once they’re available.
Can I eat or drink before this test?
No special diet or fasting is required. You can eat and drink normally before your blood draw.
Is there any risk of complications?
The blood draw itself carries minor risks like bruising or slight pain, but serious complications are rare. If you have a bleeding disorder or are on blood thinners, let your provider know before the test.
  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