| Subject | Contents |
| 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 . |
| Alternative Names | Sputum culture |
| 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. Infants and children: The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experiences, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age: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) Schoolage 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 , tuberculosis , a lung abscess , or pneumonia . Additional conditions under which the test may be performed: Aspiration pneumoniaAtypical mycobacterial infectionAtypical pneumoniaBlastomycosisBronchiectasisCoccidioidomycosis; acute (primary) pulmonaryCoccidioidomycosis; chronic pulmonaryCoccidioidomycosis; disseminatedCryptococcosisDisseminated tuberculosis (infectious)Histoplasmosis; acute (primary) pulmonaryHistoplasmosis; chronic pulmonaryHospital-acquired pneumoniaMycoplasma pneumoniaPlaguePulmonary aspergilloma (mycetoma)Pulmonary aspergillosis; invasive typePulmonary tuberculosisViral pneumonia |
| What the risks are | There are no risks with this method of obtaining a sample. |
| Special considerations | Sometimes a Gram stain or AFB stain of the sputum done at the same time can help make the diagnosis. |
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