Hives (Urticaria) diagnosis is usually made clinically and on the basis of history, especially in acute cases, and no investigations are needed. History and clinical examination are crucial in Hives (Urticaria) diagnosis.
In chronic or episodic cases, the following investigations for Hives (Urticaria) diagnosis may be done based on the history and clinical presentation:
- Complete blood count to identify problems with the immune system.
- ESR (Erythrocyte Sedimentation Rate) or CRP (C-Reactive Protein).
- Patch testing/prick testing: This test reveals if the skin is allergic to a particular substance by attaching a patch impregnated with the substance to the skin of the back.
- Excluding the suspected medication intake from history.
- Physical challenge such as cold provocation testing with ice cube, heat provocation test with warm water, pressure testing, UV light testing or exercise for cholinergic urticaria.
- Thyroid hormone levels as well as auto-antibodies to check whether you have an overactive or underactive thyroid gland.
- Dietary challenges using a variety of suspected foods.
- Stool sample to identify intestinal parasites.
- Liver function tests to rule out any liver problems.