Neutrophil count in sputum (absolute)

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like persistent cough, thick phlegm, or signs of infection (such as fever). It helps determine if your body is responding to an infection or if inflammation is present in your lungs or airways.

What to Expect Before the Test

You’ll likely cough up sputum into a sterile container. If you’re unable to produce sputum, your provider may use a swab to collect it from your throat or nasal passages. Follow any specific instructions your provider gives you, such as avoiding certain medications or foods before the test.

How the Test Works

The collected sputum is analyzed under a microscope to count the number of neutrophils. This process helps identify if there’s an abnormal presence of these cells, which could signal infection, inflammation, or other respiratory conditions.

Possible Results and Their Meaning

High neutrophil counts in sputum may indicate an active infection (such as pneumonia, bronchitis, or cystic fibrosis), chronic inflammation, or exposure to irritants. Low counts might suggest a less active infection or other underlying conditions. Your results will be interpreted by your healthcare provider in the context of your symptoms and medical history.