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Ethionamide concentration in serum/plasma (24-hour profile)

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

This test measures the amount of ethionamide, a medication used to treat tuberculosis, in your blood over a 24-hour period. It helps your healthcare provider assess how well your body is absorbing and processing the drug.

Quick summary

["This test helps ensure your tuberculosis treatment is working effectively and safely."]

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

Key facts at a glance

LOINC
25196-7
Short code
Ethionamide Islt Slgr Mcbct AB 5.0
Synonyms
Ethionamide Islt Slgr Mcbct AB 5.0
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 Is This Test Done?

Your doctor may order this test if you’re taking ethionamide as part of tuberculosis treatment. It helps monitor drug levels to prevent side effects or resistance, especially in complex treatment plans.

What Does This Test Tell You?

The test provides a snapshot of ethionamide concentration in your blood over 24 hours. Abnormal levels may indicate whether your dose needs adjustment—too little could mean the drug isn’t working, while too much may cause toxicity.

How Is This Test Performed?

Blood samples are collected at specific times (often at baseline and after dosing) to create a profile of ethionamide levels. The test uses a blood draw and a specialized immunoassay method to measure the medication.

What Are Common Results?

Results are compared to a reference range specific to ethionamide dosing and your treatment plan. Your doctor will interpret the results in the context of your medical history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Ethionamide Level (24h)

Frequently asked questions

Why might my doctor ask for this test?
Your doctor may ask for this test if you’re on ethionamide for tuberculosis, especially if you have a complex treatment plan, kidney problems, or are taking other medications that could affect drug levels.
What do my test results mean?
Results show your ethionamide levels over 24 hours. Your doctor will discuss these with you, considering your treatment goals and any symptoms you’re experiencing. They may adjust your dose if levels are too high or too low.
Can I eat or drink before this test?
You may need to follow specific instructions, such as fasting or timing your last dose of ethionamide before collection. Always check with your lab or doctor for exact guidelines.
  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