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Quantitative measurement of clofazimine concentration in serum/plasma

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

This test checks the amount of clofazimine, a medication used to treat certain infections like leprosy, in your blood.

Quick summary

["Understanding your drug levels helps ensure your treatment is working safely and effectively."]

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

Key facts at a glance

LOINC
43988-5
Short code
Clofazimine Islt Slgr Mcbct AB 0.5
Synonyms
Clofazimine Islt Slgr Mcbct AB 0.5
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 clofazimine to monitor its levels in your blood. This helps prevent side effects and ensures the medication remains effective over time.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, typically drawn from a vein in your arm, similar to other blood tests.

What the Results Mean

The results show your current clofazimine concentration. While reference ranges vary by lab, your provider will interpret these results in the context of your treatment plan and overall health.

Possible Side Effects and Monitoring

High or low levels of clofazimine can affect how your body processes the drug. Your provider may adjust your dose if needed, based on these results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinically, clofazimine levels help assess therapeutic efficacy and toxicity. Low levels may indicate insufficient treatment, while elevated levels could signal side effects or improper dosing.

Short name

Clofazimine Level

Frequently asked questions

How often will I need this test?
Your provider will determine the frequency based on your treatment plan, but it may occur periodically during your course of clofazimine therapy.
What if my results are outside the expected range?
If your results are abnormal, your healthcare provider will review them with you and may adjust your medication, dosage, or treatment plan accordingly.
Does this test interact with other medications?
Yes, clofazimine can interact with other drugs, including some antibiotics and heart medications. Always inform your provider about all medications you’re taking.
  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