Genetic Resistance to Penicillin by Lipid Susceptibility Test (Serum)
This test measures how penicillin interacts with bacterial lipids in your blood, helping determine if certain bacteria may resist penicillin treatment.
["Assists doctors in choosing the right antibiotic for infections caused by bacteria that might not respond to penicillin."]
Key facts at a glance
- LOINC
- 93698-9
- Short code
- GN resist Pnl Islt/Spm
- Synonyms
- GN resist Pnl Islt/Spm
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- molgen
- 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 evaluates the susceptibility of bacterial lipids to penicillin by analyzing how the antibiotic affects them in your serum. It’s part of a broader effort to identify bacterial strains that could be resistant to penicillin-based medications.
Why It’s Done
Doctors may order this test if you have an infection suspected to involve bacteria that could be resistant to penicillin, or if you’ve previously been treated with penicillin without success. It helps guide treatment decisions to ensure effective antibiotic therapy.
How It Works
A small sample of your serum is tested to see how penicillin interacts with bacterial components. The test measures changes in lipid properties that indicate resistance, often using specialized laboratory techniques like electrophoresis or nephelometry.
What to Expect Before the Test
No special preparation is needed. You may have a simple blood draw, similar to other routine blood tests. If you’re on blood-thinning medication, let your doctor know before the test.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Results help identify bacterial strains that may not respond to penicillin. If resistance is confirmed, doctors can switch to alternative antibiotics that are more effective. Early detection can prevent treatment failures and reduce the risk of antibiotic-resistant infections.
Short name
Penicillin Resistance Screening (Serum)
Frequently asked questions
How long does it take to get results?
What does a positive result mean?
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 16, 2026. · Read our editorial policy