Fungal sinus culture (with sensitivity testing)

This test is done to help your doctor find out whether harmful bacteria are causing your symptoms and to decide on the most effective treatment plan for your condition.

Your healthcare provider may order this test if you have persistent sinus symptoms (e.g., nasal congestion, facial pain, or discharge) that don’t improve with antibiotics, or if you have a weakened immune system or conditions like diabetes that increase fungal risk.

Before the test, your doctor will explain the procedure and review your medical history and current medicines. You may be asked to avoid eating, drinking, or taking certain medicines, including antibiotics, for a short time before your appointment.

You’ll likely have a nasal swab or sample taken during a quick office visit. No special preparation is needed, but avoid nasal decongestants for 24 hours before testing if possible.

During the test, a small sample is collected from your body and sent to a laboratory. The sample is examined for signs of a bacterial infection, and the findings help your doctor confirm or rule out infection as the cause of your symptoms.

The collected sample is grown in a lab under controlled conditions to identify fungal species. Sensitivity testing helps determine which antifungal medications may be most effective.

A positive result usually means bacteria were found in your sample and treatment may be needed. A negative result suggests no bacterial infection was detected at the time of testing. Your doctor will review your specific results with you and explain what they mean and what should happen next.

Positive results show the presence of fungi, which may require antifungal medications. Negative results mean no fungi were detected in the sample. Results may take 5–14 days to complete.