Which criterion would lead to rejecting a sputum sample for culture?

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Multiple Choice

Which criterion would lead to rejecting a sputum sample for culture?

Assessing sputum quality focuses on whether the specimen truly represents material from the lower respiratory tract. A good sputum sample should contain inflammatory cells, especially neutrophils, and mucus, with relatively few squamous epithelial cells that reflect oral contamination. Excess squamous epithelial cells with little or no white blood cells or mucus indicates the sample is mostly saliva from the mouth or throat, not lower airway secretions. This contamination can lead to misleading culture results because oral flora would dominate, so such a specimen is rejected for culture. In contrast, a high white blood cell count with abundant mucus suggests an inflammatory sputum sample from the lungs, which is appropriate for culture. Visible purulence and strong odor can accompany infection and don’t by themselves justify rejection. An adequate sample with neutrophils is ideal for accurate culture.

Assessing sputum quality focuses on whether the specimen truly represents material from the lower respiratory tract. A good sputum sample should contain inflammatory cells, especially neutrophils, and mucus, with relatively few squamous epithelial cells that reflect oral contamination.

Excess squamous epithelial cells with little or no white blood cells or mucus indicates the sample is mostly saliva from the mouth or throat, not lower airway secretions. This contamination can lead to misleading culture results because oral flora would dominate, so such a specimen is rejected for culture.

In contrast, a high white blood cell count with abundant mucus suggests an inflammatory sputum sample from the lungs, which is appropriate for culture. Visible purulence and strong odor can accompany infection and don’t by themselves justify rejection. An adequate sample with neutrophils is ideal for accurate culture.

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