Afmgcyp51atr34tr46mtbalnaaprobe
This test detects genetic mutations in Aspergillus fumigatus that cause resistance to antifungal medications.
Detects TR34 and TR46 mutations in the CYP51A gene of Aspergillus fumigatus Helps doctors choose the right antifungal medicine for treatment Uses sample from bronchoalveolar lavage (BAL) fluid Results guide treatment decisions for invasive Aspergillus infections Important when standard antifungal treatments are not working
Key facts at a glance
- LOINC
- 111821-5
- Short code
- A.fmg CYP51A TR34/TR46 mt BAL NAA+probe
- Synonyms
- A.fmg CYP51A TR34/TR46 mt BAL NAA+probe
- 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
This test is a laboratory analysis performed on a small sample from your body to give your healthcare team important information about your health. It can help detect a medical condition, confirm a diagnosis, or check how well a treatment is working over time.
The Aspergillus CYP51A Resistance Mutation Test is a molecular test that looks for specific genetic changes (called TR34 and TR46 mutations) in the CYP51A gene of Aspergillus fumigatus fungus. These mutations can make the fungus resistant to certain antifungal medications called azoles (such as voriconazole, posaconazole, and itraconazole).
The sample is usually collected at a clinic, hospital, or laboratory. Depending on what your doctor has ordered, this may involve drawing a small amount of blood from a vein in your arm, collecting a urine sample, or taking a swab from the affected area. The procedure is typically quick, and you can usually return to your normal activities right away.
For this test, a sample of bronchoalveolar lavage (BAL) fluid is collected. During a bronchoscopy, salt water is flushed into a specific area of the lung and then collected back. This fluid contains cells and material from the airways and lungs, which can be tested for the presence of Aspergillus and its genetic mutations.
This test is important because it provides objective information that guides your care. It can help identify health problems early, before symptoms appear, and allows your provider to make informed decisions about diagnosis, treatment, and follow-up monitoring.
This test is important because azole-resistant Aspergillus infections are becoming more common worldwide. When a patient has an invasive Aspergillus infection that does not improve with standard antifungal treatment, doctors need to know if the fungus has these resistance mutations. This information helps them select alternative antifungal medications that will be more effective.
Your results will be compared with a reference range, which is the expected range for healthy individuals. A value outside this range does not always mean something is wrong, so it is best to review your results with your healthcare provider, who can explain what they mean in the context of your overall health.
If the test detects TR34 or TR46 mutations, it means the Aspergillus strain is likely resistant to azole antifungal drugs. Your doctor will then choose a different class of antifungal medication for treatment. If no mutations are found, standard azole medications may still be effective, though your doctor will consider the complete clinical picture.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is primarily used for patients with suspected or confirmed invasive Aspergillus fumigatus infection who are not responding to standard azole antifungal therapy. Detection of TR34/TR46 mutations helps guide antifungal treatment selection, as these mutations are associated with multi-azole cross-resistance. Early detection of resistance can improve patient outcomes by enabling timely adjustment of antifungal therapy.
Frequently asked questions
Who needs this test?
How long does it take to get results?
What do the results mean for my treatment?
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Sources
- 1
- 2
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