Zalcitabine Phenotype (Antiviral Resistance Genotyping)
This test checks whether your body may be developing resistance to the antiviral medication zalcitabine, which is used to treat certain viral infections like HIV or hepatitis. It involves analyzing a small sample of your blood to examine genetic markers.
["Understanding your resistance profile helps doctors adjust treatment plans to improve effectiveness and reduce side effects."]
Key facts at a glance
- LOINC
- 30271-1
- Short code
- Zalcitabine Islt Phenotyp
- Synonyms
- Zalcitabine Islt Phenotyp
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- phenotyping
- 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 Is Done
Doctors may recommend this test if you’re taking zalcitabine and show signs of treatment failure, such as persistent or recurring symptoms, despite following the prescribed dosage. It’s also used in research or specialized care settings to guide long-term management.
What to Expect Before the Test
No special preparation is needed. A healthcare provider will collect a small blood sample, usually from your arm, using a needle. The process takes a few minutes, and you may experience slight discomfort or bruising afterward.
What the Test Results Mean
Results identify specific genetic variations (mutations) in your DNA that may make zalcitabine less effective. These findings help determine if your treatment needs to be changed, such as switching to a different antiviral medication or adjusting the dose.
Common Side Effects of Zalcitabine
While this test itself doesn’t cause side effects, taking zalcitabine can sometimes lead to mild issues like nausea, fatigue, or skin reactions. Always discuss any concerns with your doctor.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Resistance testing is critical for managing chronic viral infections where antiviral medications are used. Early detection of resistance allows for timely adjustments to treatment, preventing disease progression and improving patient outcomes. It’s particularly important in HIV care, where resistance can develop quickly if treatment isn’t optimized.
Short name
Zalcitabine Resistance Testing
Frequently asked questions
Will this test hurt?
How long will I need to wait for results?
Can I stop taking zalcitabine while waiting for 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 16, 2026. · Read our editorial policy