Invasive methods for obtaining a sputum sample for laboratory analysis include:

Question

Quizplus · Accepted Answer

Although sputum specimens may be obtained with all the techniques listed in this question, having a patient expectorate ("cough up") a sample of mucus is a noninvasive method of sputum sampling. Samples obtained by coughing are often contaminated by oral flora. The other three methods are invasive methods. (The body is entered to remove the specimen, and the specimens are more likely to reflect any pathogenic organisms in the lower airway instead of the mouth.) Bronchoalveolar lavage (BAL) is one common method used by pulmonologists. Airway suctioning through a ventilator circuit is often performed by respiratory care practitioners.

Invasive Methods for Obtaining a Sputum Sample for Laboratory Analysis