Skip to content
My WebMD Sign In, Sign Up

Rapid Sputum Tests for Tuberculosis (TB)

Font Size

Topic Overview

Rapid sputum tests are used to diagnose tuberculosis (TB) when other tests show that a person probably has TB. Rapid sputum tests are also called nucleic acid amplification tests (NAAs).

One of the best ways to diagnose TB is through a sputum culture. A culture uses a sample of mucus from the lungs (sputum) that is placed under special conditions that allow TB bacteria to grow. If TB bacteria grow, then the person has tuberculosis. The test also can show if a lung infection is caused by some other kind of bacteria. But a sputum culture can take 1 to 8 weeks to provide results.

Recommended Related to Health A-Z

Lysosomal Free Sialic Acid Storage Disorders

Important It is possible that the main title of the report Lysosomal Free Sialic Acid Storage Disorders is not the name you expected.

Read the Lysosomal Free Sialic Acid Storage Disorders article > >

Rapid sputum tests can tell if a person has TB within 24 hours. A test may be done when:1

  • A person is thought to have TB, but confirmation is needed before sputum culture results will be ready.
  • A person may be infected with bacteria other than TB bacteria.
  • A person who may have TB has been close to other people who will need treatment if they have been exposed.
1

WebMD Medical Reference from Healthwise

Last Updated: April 04, 2013
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
Next Article:

Rapid Sputum Tests for Tuberculosis (TB) Topics

Hot Topics

WebMD Video: Now Playing

Click here to wach video: Dirty Truth About Hand Washing

Which sex is the worst about washing up? Why is it so important? We’ve got the dirty truth on how and when to wash your hands.

Click here to watch video: Dirty Truth About Hand Washing

Popular Slideshows & Tools on WebMD

feet
Solutions for 19 types.
row of colored highlighter pens
Tips for living better.
oatmeal and eggs
The best and worst for you.
neti pot
6 steps for nasal irrigation.
MS Overview
Recognizing symptoms.
stressed working woman
And how to fix them?
woman walking in fog
12 tips for managing your disease.
Healthy Snack
13 delicious options.
Woman running
10 ways to boost your metabolism.
lone star tick
How to identify that bite.
young woman in sun
What to watch for.
Colored x-ray of tooth decay
What are the top ones?

Women's Health Newsletter

Find out what women really need.