Sputum is mucus that is coughed up from the lower airways; it’s called phlegm before it’s expelled by coughing. Sputum is not to be confused with saliva, the watery substance secreted by the salivary glands in the mouth.
Sputum samples are usually sent to confirm respiratory infections and can tell the doctor which treatments may help to reduce symptoms.
Usually we produce small volumes of clear sputum each day which is cleared and swallowed without noticing. In chronic bronchitis more sputum than usual is produced and with infections the sputum will often increase in volume and change colour to yellow or green. To learn more simply contact South West Sleep Clinic for a consultation.
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