Staphylococcus aureus Methicillin Resistance Detection by mecA Gene Presence (PCR-based)
This test checks for the presence of the *mecA* gene, which helps determine if certain *Staphylococcus aureus* bacteria are resistant to common antibiotics like penicillin and methicillin.
["Helps identify antibiotic-resistant bacteria that may require different treatment plans."]
Key facts at a glance
- LOINC
- 94424-9
- Short code
- MRSA SCCmec+orfX Islt/Spm Ql
- Synonyms
- MRSA SCCmec+orfX Islt/Spm Ql
- 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
- molgen
- CPT
- 86430
- 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
Why This Test Matters
Antibiotic resistance, including MRSA, can make infections harder to treat. This test helps doctors choose the best antibiotics to fight infection safely and effectively.
How the Test Works
The test uses a small sample of blood or other bodily fluid to detect the *mecA* gene, which is linked to MRSA resistance. A special lab process (PCR) amplifies and identifies this genetic marker.
Sample Collection
You may have a blood draw or provide a swab sample (e.g., from a wound or nasal passage) depending on the clinical need. The lab processes the sample to check for the *mecA* gene.
What to Expect After the Test
Results are typically ready within a few days. If positive, it means the bacteria may be resistant to certain antibiotics, guiding your doctor’s treatment plan.
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: Understanding MRSA and Treatment
Short name
MRSA mecA Gene Screening
Frequently asked questions
MRSA is a type of *Staphylococcus aureus* bacteria that can cause infections in skin, wounds, or even bloodstream. Detecting the *mecA* gene helps doctors avoid using ineffective antibiotics, reducing the risk of antibiotic resistance spreading.
What does a positive result mean?
How long does it take to get results?
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