Chronic rhinosinusitis with nasal polyps is a long-term inflammatory condition that affects both the nasal passages and sinuses, causing uncomfortable symptoms and significantly impacting daily life. Understanding how this condition is diagnosed can help you take the first steps toward finding relief and regaining control over your health.

Introduction: When to Seek Diagnostic Testing

Diagnosing chronic rhinosinusitis with nasal polyps begins with recognizing that something is persistently wrong. If you have been dealing with symptoms such as a stuffy or runny nose, facial pain or pressure, loss of smell, or mucus running down the back of your throat for more than 12 consecutive weeks, it is time to seek medical attention. These are not ordinary cold symptoms that will disappear on their own within a few days or weeks.^[2][3]

The decision to undergo diagnostic testing should not be delayed if your quality of life is suffering. Many people live with these symptoms for months or even years before receiving a proper diagnosis, often because the signs are mistaken for common allergies or recurring colds. However, chronic rhinosinusitis with nasal polyps is a distinct condition that requires specific diagnosis and treatment.^[5]

Anyone experiencing persistent nasal and sinus symptoms should consider seeing a healthcare provider. However, certain groups are at higher risk and should be especially vigilant. People with asthma are more likely to develop nasal polyps, and the condition is also more common in individuals aged 40 to 60 years.^[3] Males are affected more frequently than females, though the reasons for this difference are not fully understood.^[3]

You should also seek diagnostics if you have noticed that standard treatments for allergies or sinus infections are not providing lasting relief. If you find yourself repeatedly using nasal sprays, taking antibiotics, or dealing with recurring infections without improvement, these are signs that a more thorough diagnostic evaluation is needed.^[2]

Diagnostic Methods for Identifying Chronic Rhinosinusitis with Nasal Polyps

The diagnosis of chronic rhinosinusitis with nasal polyps is based on a combination of your reported symptoms and objective evidence obtained through physical examination or imaging tests. Healthcare providers use a methodical approach to confirm the condition and rule out other possible causes of your symptoms.^[7]

Symptom Assessment and Medical History

The first step in diagnosis involves a detailed discussion of your symptoms. Doctors look for the presence of at least two out of four cardinal symptoms that have persisted for at least 12 consecutive weeks. These cardinal symptoms include facial pain or pressure, reduced or lost sense of smell (known as hyposmia or anosmia), nasal drainage, and nasal obstruction or congestion.^[7]

Your healthcare provider will also review your medical history, paying close attention to whether you have asthma, allergies, recurring sinus infections, or other related conditions. This information helps the doctor understand the broader context of your symptoms and identify potential contributing factors.^[2][4]

Physical Examination

During a physical examination, your doctor will look for signs of inflammation and the presence of nasal polyps. This may begin with a simple visual inspection of your nose and face, checking for tenderness around the sinuses by gently pressing on your forehead, cheeks, and nose.^[4][12]

Anterior rhinoscopy is a basic examination technique where the doctor uses a light and a tool called a nasal speculum to look inside the front part of your nose. This allows them to see visible signs of inflammation, discharge, or the presence of polyps near the opening of the nasal passages.^[7]

Nasal Endoscopy

The most definitive method for diagnosing nasal polyps is nasal endoscopy. This procedure involves inserting a thin, flexible tube with a tiny camera and light on the end into your nose. The camera, called an endoscope, allows the doctor to see deep inside your nasal passages and sinuses, providing a clear view of any polyps, inflammation, or blockages.^[2][4]

Nasal endoscopy is typically performed in the doctor’s office and is generally well tolerated by most patients. It provides direct visualization of the nasal cavity and is considered the gold standard for confirming the presence of nasal polyps. The doctor can see the size, location, and extent of the polyps, which helps guide treatment decisions.^[2]

Computed Tomography (CT) Scan

A computed tomography scan, commonly known as a CT scan, is an imaging test that creates detailed cross-sectional images of your sinuses and nasal passages. It is considered the imaging study of choice for confirming the diagnosis of chronic rhinosinusitis and assessing the extent of disease.^[7]

The CT scan can show the size and location of nasal polyps, as well as any blockages in the sinus cavities. It also helps doctors identify complications or anatomical issues that may be contributing to the condition. The images are particularly useful for planning surgical procedures if conservative treatment fails.^[7][4]

Most CT scans for sinus evaluation are performed without contrast dye, making them quick and non-invasive. However, doctors typically avoid ordering multiple CT scans within a short period unless there is a specific medical need, as the test involves exposure to radiation.^[7]

Allergy Testing

Because allergies can worsen chronic rhinosinusitis with nasal polyps, your doctor may recommend allergy testing to identify specific allergens that might be triggering or aggravating your symptoms. This is especially important if you have a history of allergic rhinitis or if avoiding certain environmental triggers might help improve your condition.^[2]

Allergy testing can be done through skin prick tests, where tiny drops of common allergens are applied to your skin to see if a reaction occurs. Alternatively, blood tests can screen for specific antibodies that indicate allergic sensitivities. Identifying and managing allergies can be an important part of your overall treatment plan.^[2]

Additional Testing for Related Conditions

In some cases, doctors may order additional tests to rule out other conditions or identify underlying causes. For example, if you are diagnosed with nasal polyps at a young age, your doctor might test for cystic fibrosis, a genetic condition that can cause polyps to develop. This typically involves a sweat test to measure the salt content in your sweat.^[4][12]

Blood tests may also be performed to check for immune system disorders or other conditions that could be contributing to chronic inflammation in the sinuses. These tests help ensure that your diagnosis is accurate and that any underlying health issues are properly addressed.^[4]

Diagnostics for Clinical Trial Qualification

When patients are being considered for enrollment in clinical trials for chronic rhinosinusitis with nasal polyps, they must undergo specific diagnostic tests to ensure they meet the study’s eligibility criteria. These tests are standardized across trials to create a consistent baseline for measuring treatment outcomes.^[9]

Nasal Polyp Score

One of the most common measures used in clinical trials is the nasal polyp score. This is a standardized assessment performed during nasal endoscopy to grade the size of polyps on a scale, typically from 0 to 4, with higher numbers indicating larger or more extensive polyps. This objective measurement allows researchers to track changes in polyp size over the course of treatment.^[9]

Symptom Severity Scales

Clinical trials often require patients to complete questionnaires that measure the severity of their symptoms. One widely used tool is the 22-item Sino-Nasal Outcome Test, known as SNOT-22. This questionnaire asks patients to rate various symptoms and how they affect daily life, providing a comprehensive picture of disease burden.^[9]

Patients may also be asked to rate specific symptoms such as nasal congestion severity using a visual scale. These assessments help researchers determine whether a treatment is providing meaningful improvements in quality of life.^[9]

Smell Testing

Loss of smell is a significant symptom for many people with nasal polyps. Clinical trials may include standardized smell tests, such as the University of Pennsylvania Smell Identification Test (UPSIT), to measure the extent of smell loss at the beginning of the study and track improvements during treatment.^[9]

Imaging and Blood Tests

CT scans are often used in clinical trials to provide objective evidence of sinus inflammation and polyp size at baseline and after treatment. Blood tests may also be required to measure levels of specific inflammatory markers, such as eosinophils, which are white blood cells often elevated in patients with chronic rhinosinusitis with nasal polyps. These measurements help identify patients with type 2 inflammation, a specific pattern of immune response that many new biologic treatments target.^[5][9]

Medication and Treatment History

Before entering a clinical trial, patients must provide detailed information about their previous treatments, including medications, surgeries, and other interventions. Trials often require that patients have already tried standard treatments, such as nasal corticosteroids or sinus surgery, without adequate control of their symptoms. This ensures that the trial is studying treatments for patients with more difficult-to-manage disease.^[9][15]