Why is an early morning sputum specimen preferred for certain tests?

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Collecting sputum first thing in the morning improves test accuracy because it minimizes saliva contamination and provides a sample that more closely represents secretions from the lower respiratory tract. When you wake up, the airways have been accumulating mucus overnight, so the sputum is richer in lower‑airway secretions and less mixed with oral saliva. Saliva can dilute the specimen and introduce oral bacteria, which can obscure or interfere with detecting the target organisms. By obtaining a morning sample, the test is more likely to detect pathogens that reside in the lungs. For best results, collect before eating or drinking and cough deeply to bring up sputum from the lower airways.