Methicillin-Resistant Staphylococcus aureus (MRSA) Detection by Genetic Probe (Plasma/Serum)
This test checks for the presence of specific genetic material linked to methicillin-resistant Staphylococcus aureus (MRSA) bacteria in your blood or plasma. It helps determine if you may have an infection caused by this antibiotic-resistant strain.
["Assists healthcare providers in identifying MRSA infections for targeted treatment."]
Key facts at a glance
- LOINC
- 72892-3
- Short code
- SCCmec + mecA pnl Nose NAA+probe
- Synonyms
- SCCmec + mecA pnl Nose NAA+probe
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 0
- Ref high
- 2
- 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
The test detects genetic sequences (called *mecA* or *mecC*) that are associated with MRSA’s resistance to certain antibiotics. These genes are not present in regular *Staphylococcus aureus* bacteria, making the test specific for MRSA.
Why It’s Done
Your doctor may order this test if you have symptoms of a bacterial infection (such as fever, redness, or pus) or if you’ve been exposed to MRSA. It’s also used in hospitals or long-term care settings to monitor for outbreaks or prevent spread.
Sample Collection and Preparation
A small blood sample is drawn from your arm, and the plasma (liquid part of blood) is tested. The genetic probe identifies MRSA DNA if present, without needing to grow the bacteria in a lab.
How Results Are Interpreted
Results are qualitative (positive or negative). A positive result means MRSA DNA was detected, which may indicate an MRSA infection. A negative result means no MRSA DNA was found, but other tests may still be needed to confirm or rule out infection.
Reference range
NCBI: SCC <2.0 ng/mLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
MRSA Probe Test
Frequently asked questions
MRSA is a serious antibiotic-resistant infection that can cause skin infections, bloodstream infections, or pneumonia. Early detection helps doctors choose the right antibiotics to treat it, reducing the risk of complications or spread to others.
How long will I need to wait for results?
Can I take antibiotics before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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 17, 2026. · Read our editorial policy