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A sputum culture is a test to detect and identify bacteria [1] or fungi that infect the lungs or breathing passages. Sputum is a thick fluid produced in the lungs and in the adjacent airways. Normally, fresh morning sample is preferred for the bacteriological examination of sputum. [ 2 ]
A sputum sample will also be obtained to ascertain the causative bacteria. This also plays a role in informing treatment options. [5] [6] In some cases, pulse oximetry may also be required as pneumonia is known to deplete oxygen levels in the blood. [7] Other vitals such as pulse and body temperature are also checked.
Blood-streaked sputum –an indicator of possible inflammation of the throat (larynx and/or trachea) or bronchi; lung cancer; other bleeding erosions, ulcers, or tumors of the lower airway. Pink sputum – it indicates sputum evenly mixed with blood from alveoli and/or small peripheral bronchi as is seen in potential pulmonary edema.
Physical examination may sometimes reveal low blood pressure, high heart rate, or low oxygen saturation. [24] The respiratory rate may be faster than normal, and this may occur a day or two before other signs. [24] [29] Examination of the chest may be normal, but it may show decreased expansion on the affected side.
Sampling of sputum from the lungs for sputum culture. It can be performed by special techniques of coughing, or by a protected specimen brush (PSB), [1] which is a brush that can be retracted into a plastic tube to prevent contamination of bacteria in the throat while inserting and removing the instrument.
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