The action that best ensures a usable specimen is : Instruct the client to inhale deeply and then cough.
What is sputum ?
The best way to collect a sputum specimen which a mixture of saliva and some level of mucus from a patient is when the patient coughs after inhaling deeply because the required amount of sputum containing enough mucus from the respiratory tract will be collected to proper examination.
The collected sputum is inspected for viral and bacterial infection by the health care provider.
Hence we can conclude that The action that best ensures a usable specimen is : Instruct the client to inhale deeply and then cough.
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