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Nocardia species detection (qualitative culture)

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

This test checks for the presence of *Nocardia* bacteria in a sample, which can cause infections in the lungs, skin, or other body parts.

Quick summary

["It helps diagnose infections caused by *Nocardia*, a rare but serious type of fungus-like bacteria."]

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

Key facts at a glance

LOINC
43365-6
Short code
Nocardia Spec Cult
Synonyms
Nocardia Spec Cult
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 fever, cough, or skin sores that could be linked to a *Nocardia* infection. It’s also used in people with weakened immune systems, such as those with HIV/AIDS or certain cancers, who are more vulnerable to infections.

What to Expect Before the Test

You may need to provide a sample from an affected area (e.g., sputum from the lungs, pus from a skin lesion, or cerebrospinal fluid if the infection is in the brain). The sample is sent to a lab for culture growth over days or weeks.

How the Test Works

The lab grows the sample in a controlled environment to see if *Nocardia* bacteria grow. If present, they appear as colonies under a microscope or through special staining techniques.

What the Results Mean

A positive result means *Nocardia* bacteria were found in your sample. A negative result means no growth was detected, but further testing may be needed to rule out other causes of your symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

*Nocardia* infections are serious and often require antibiotics like trimethoprim-sulfamethoxazole. Early detection improves treatment success, especially in immunocompromised patients. Results guide doctors in choosing the right antibiotics or further diagnostic steps.

Short name

Nocardia culture

Frequently asked questions

When might I get my results?
Results can take several days to weeks, as cultures require growth. Your doctor will contact you once they’re ready.
What if I have no symptoms but the test is ordered?
This test is usually only done if you have symptoms or risk factors (e.g., weakened immune system). False positives are rare, but false negatives can happen if the sample isn’t collected properly.
Can I take antibiotics before the test?
No, antibiotics may interfere with the test. If you’ve been prescribed them, ask your doctor to delay the test until after you finish the course.
  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