Rifampin Drug Concentration (Serum)
This test measures the amount of rifampin, an antibiotic used to treat certain infections like tuberculosis, in your blood. It helps doctors check if the drug is working at the right level.
["This test helps ensure your rifampin dose is effective and safe."]
Key facts at a glance
- LOINC
- 25202-3
- Short code
- rifAMPin Islt Slgr Mcbct AB 1.0
- Synonyms
- rifAMPin Islt Slgr Mcbct AB 1.0
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- method-for-slow-growing-mycobacteria-antibiotic-concentration-at-ug-ml
- 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
Your healthcare provider may order this test if you’re taking rifampin to treat infections such as tuberculosis, leprosy, or other bacterial infections. It helps monitor how much of the drug is in your bloodstream to avoid side effects or ineffective treatment.
What to Expect Before the Test
No special preparation is needed, but you may be asked to fast for a few hours before the blood draw if instructed by your doctor. Bring a list of all medications, including over-the-counter drugs and supplements, to share with your provider.
What Happens During the Test
A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood sample will be sent to a lab for analysis.
What the Results Mean
Results are typically reported as a concentration value (e.g., micrograms per milliliter). Your doctor will interpret these results in relation to your specific treatment plan and medical history to determine if your dose needs adjustment.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
High rifampin levels may indicate overdose or poor drug absorption, potentially causing side effects like nausea, rash, or liver issues. Low levels could mean the infection isn’t being adequately treated. Regular monitoring helps balance effectiveness and safety.
Short name
Rifampin Level
Frequently asked questions
How often will I need this test?
What are common side effects of rifampin?
Can I drink alcohol 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