Unfortunately, there is no test available to determine the presence of urticaria. If a patient is experiencing an itchy, bumpy skin rash, a doctor will diagnose based on medical history and other factors. One question the doctor will likely ask is what the patient was doing or eating when the hives appeared. This may aid the doctor in both confirming the diagnosis and confirming the cause. However, it may not always be possible for the doctor to determine the cause of the outbreak. Sometimes, a confirmed diagnosis of urticaria is impossible.

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