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Mycobacterium species culture (with growth confirmation)

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

This test checks for the presence of *Mycobacterium* bacteria, which can cause infections like tuberculosis or other mycobacterial diseases. It involves growing a sample from your body to identify specific bacteria.

Quick summary

["A positive result helps diagnose infections caused by slow-growing bacteria that require special treatment."]

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

Key facts at a glance

LOINC
44854-8
Short code
Mycobacterium Spec Cult org #4
Synonyms
Mycobacterium Spec Cult org #4
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 This Test Is Done

Doctors may order this test if you have symptoms like persistent cough, fever, weight loss, or fatigue—especially if you’ve been exposed to tuberculosis or have a weakened immune system. It’s also used to confirm infections in people with chronic illnesses or after exposure to *Mycobacterium* species.

How the Test Works

A sample (often from sputum, blood, or other body fluids) is collected and placed in a special growth medium. Over weeks to months, bacteria are cultured to see if they grow. Confirmation may require additional tests to identify the specific strain.

Sample Collection

You’ll likely provide a sample like sputum (from coughing), urine, or blood, depending on the suspected infection site. Follow your doctor’s instructions carefully to ensure accuracy.

Turnaround Time

Results can take weeks or months, as slow-growing bacteria require extended incubation. Your doctor will discuss next steps based on findings.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Mycobacterium Culture

Frequently asked questions

What Does a Positive Result Mean?
A positive result confirms the presence of *Mycobacterium* bacteria, which may require specific antibiotics like rifampin, isoniazid, or ethambutol. Treatment depends on the strain and your health status.
What Does a Negative Result Mean?
A negative result means no detectable bacteria were grown in the sample, but it doesn’t rule out infection if the sample wasn’t collected correctly or the bacteria are extremely slow-growing.
How Often Is This Test Needed?
This test is typically done once or twice during treatment to monitor response. Repeat cultures may be needed if symptoms persist or if the bacteria are resistant to initial treatments.
  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