Nasal Discharge For Culture and Sensitivity

Function

The Nasal Culture and Sensitivity (C/S) test is designed to identify pathogenic bacteria or fungi residing in the nasal cavity or sinuses. The 'culture' portion involves growing the organisms in a lab, while the 'sensitivity' portion determines which antibiotics are most effective at killing the specific strain identified.

Why it is Ordered

This test is primarily used for patients suffering from chronic or severe sinusitis that does not respond to initial empirical antibiotic therapy. It is also used to screen for healthcare-associated pathogens, such as Methicillin-resistant Staphylococcus aureus (MRSA), in pre-operative patients or healthcare workers.

Associated Conditions

• Bacterial Sinusitis: Often caused by Streptococcus pneumoniae or Haemophilus influenzae.
• MRSA Colonization: Identifying carriers of resistant staph bacteria to prevent spread.
• Fungal Sinusitis: More common in immunocompromised individuals.
• Nasal Vestibulitis: Infection of the nasal entrance.

Clinical Importance

Accurate identification is vital for antibiotic stewardship. By knowing exactly which bacteria are present and which drugs they are susceptible to, clinicians can avoid using broad-spectrum antibiotics that contribute to global resistance. It helps differentiate between viral infections (which won't grow on standard bacterial media) and bacterial infections.