Routine sputum culture

Alternative names

Sputum culture

Definition

Sputum is a secretion that is produced in the lungs and the bronchi (tubes that carry the air to the lung). This mucus-like secretion may become infected, bloodstained, or contain abnormal cells that may lead to a diagnosis. Sputum is what comes up with deep coughing.

How the test is performed

You are asked to cough deeply and spit any sputum in a sterile cup. The sputum is then taken to the laboratory. There, it is placed in a medium under conditions that allow the organisms to grow.

How to prepare for the test

Increasing the amount of fluids the night before the test may help to get the sample.

For infants and children:

The preparation you can provide for this test depends on your child's age and experience. For specific information regarding how you can prepare your child, see the following topics:

• Infant test or procedure preparation (birth to 1 year)
  
• Toddler test or procedure preparation (1 to 3 years)
  
• Preschooler test or procedure preparation (3 to 6 years)
  
• School age test or procedure preparation (6 to 12 years)
  
• Adolescent test or procedure preparation (12 to 18 years)
  

How the test will feel

You will need to cough. Sometimes the health care provider will tap on the chest to loosen the sputum. There may be a steam-like mist to inhale to help cough up the sample.

Why the test is performed

The cultures and tests are done on the sputum to help identify the bacteria that are causing an infection in the lungs or the airways (bronchi).

Normal Values

No presence of disease-causing organisms in the sputum is normal.

What abnormal results mean

The abnormal results will be reported as a positive culture. That means that there is a disease-producing organism found that may help diagnose bronchitis, , a lung abscess, or .