Dermatologists and allergists can both diagnose CIU based on the following information:
Blood test - A blood sample may be taken to count the different parts of your blood, like white blood cells and red blood cells. This may be done to rule out infection as the cause of your hives.
Skin test - Your skin may be pricked to confirm whether you have allergies.
These tests and more may be done to rule out any other health conditions that could be causing your symptoms.
If a cause still isn't found, your doctor may diagnose you with CIU.
Antihistamines are generally the first treatment option.
An injectable medication can also be prescribed, that is currently used to treat adults and children 12 years and older with CIU
To help with the itch and swelling, an oral steroid may also be prescribed to you for short periods of time.