Wegeners Granulomatosis

How GPA is diagnosed

Source: NHS

Your doctor may suspect GPA if you feel unwell, have a persistent fever and have lost weight, and one or more of the following areas of your body is affected:

  • your nose, ears and sinuses for example, you have persistent earache , nosebleeds or sinusitis
  • lungs for example, you have difficulty breathing or are coughing up blood, or your chest X-ray shows lung abnormalities
  • kidneys for example, there is blood or protein in your urine

Blood tests may be done to test levels of ANCAs (antineutrophil cytoplasmic antibodies). These are antibodies thought to be involved in the process that leads to the blood vessels becoming inflamed.

However, this test can sometimes come back negative in people with GPA and positive in people who dont have the condition, so it can't be relied upon on its own to diagnose the condition.

A tissue sample of the affected area may also be removed (a biopsy ) and looked at under the microscope for evidence of inflammation. In GPA, white blood cells clump together to form tiny lumps called granulomas.

Computerised tomography (CT) scans and magnetic resonance imaging (MRI) scans may also be carried out to assess the condition of any organs or areas of the body that may be affected.

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