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Mycobacterium tuberculosis Culture (Cultivation) with Specific Identification

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

This test involves growing bacteria from your sample to identify if *Mycobacterium tuberculosis*—the germ responsible for tuberculosis—is present.

Quick summary

["A culture helps determine if TB bacteria are growing in your body and guides treatment decisions."]

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

Key facts at a glance

LOINC
44855-5
Short code
Mycobacterium Spec Cult org #5
Synonyms
Mycobacterium Spec Cult org #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
organism-specific-culture
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 healthcare provider may order this test if you have symptoms like persistent cough, fever, or weight loss, especially if you live in an area with higher TB risk. It’s also used to confirm TB after a positive initial screening test or if treatment isn’t working.

How Is the Sample Collected?

A healthcare professional will take a sample, often from your sputum (thick mucus from your throat), lung fluid, or other body fluids like blood or urine. The sample is sent to a lab where bacteria are grown in special media over weeks to months.

What Does a Positive Result Mean?

A positive result means *Mycobacterium tuberculosis* was detected in your sample, confirming TB infection. This helps your doctor choose the right treatment, such as antibiotics, to kill the bacteria.

What Does a Negative Result Mean?

A negative result means no *Mycobacterium tuberculosis* was found in the sample at the time of testing. However, TB can take time to grow, so repeated testing may be needed if symptoms persist.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Mycobacterium Tuberculosis Culture

Frequently asked questions

How long does it take to get results from this test?
Results can take weeks to months, as the bacteria need time to grow in the lab. Your doctor will discuss follow-up steps if needed.
Can I take antibiotics before this test?
No, antibiotics can interfere with the test. If you suspect TB, tell your doctor immediately so they can adjust your care plan.
Is there any risk or discomfort with sample collection?
Sample collection may cause mild irritation or discomfort, like coughing or throat irritation. Follow your provider’s instructions for aftercare.
  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