Effective specimen collection is paramount for obtaining reliable test results. Nasopharyngeal (NP) swabs are the preferred specimen for pertussis testing, as B. pertussis colonizes the nasopharynx. Proper technique is crucial to ensure the collection of an adequate sample. Here’s a step-by-step guide to NP swab collection: 1. Prepare the patient by explaining the procedure and ensuring cooperation. 2. Position the …