Skip to content

Rifabutin concentration in serum/plasma (quantitative measurement)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of rifabutin, an antibiotic used to treat certain infections like tuberculosis, in your blood.

Quick summary

["Knowing your rifabutin levels helps doctors monitor your dose and prevent side effects."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
25201-5
Short code
Rifabutin Islt Slgr Mcbct AB 4.0
Synonyms
Rifabutin Islt Slgr Mcbct AB 4.0
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 doctor may order this test if you’re taking rifabutin to treat or prevent tuberculosis or other infections. It helps ensure the medication is working at the right level in your body and avoids unnecessary exposure.

What to Expect Before the Test

No special preparation is needed. A healthcare provider will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort.

What the Results Mean

Results help your doctor adjust your rifabutin dose if needed. They don’t provide a direct range for interpretation, but they’re used alongside clinical judgment to guide treatment.

Common Reasons for Monitoring

Doctors monitor rifabutin levels to avoid toxicity (e.g., liver damage) or insufficient effectiveness. This is especially important if you’re taking other medications that interact with rifabutin.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Rifabutin Level

Frequently asked questions

How long does it take to get the results of this test?
Results are typically available within 1–3 business days, depending on your lab. Your doctor will contact you with the findings.
Can I eat or drink before this test?
You can eat and drink normally before the blood draw, as no fasting is required.
What are the possible side effects of rifabutin?
Common side effects may include nausea, rash, or liver enzyme changes. Severe reactions (rare) can include liver damage or allergic reactions. Always report any unusual symptoms to your doctor.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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