Cough deeply from the lungs after taking several deep breaths. One teaspoon of sputum is needed for the test. The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. Deep coughing is required. There are no risks.
Abnormal results indicate a malignancy of the respiratory tract.
A tumor of the respiratory system can exist without shedding cells into the sputum.