How is it diagnosed?

 Acute urticaria do not need extensive diagnostic procedures. Urticaria activity score is a useful tool for evaluation of urticaria.

 Complete blood count (CBC) Including eosinophil count in case of underlying parasite

 Erythrocyte sedimentation rate (ESR) which is elevated in case of vasculitis

 Urea and electrolyte, thyroid and liver function test which might reveal an underlying disorder

 C reactive protein are important investigations for diagnosis of infections in urticaria.

 Autologous Serum Skin Test (ASST)is a simple office procedure for diagnosis of auto reactive urticaria.

 Total IgE and specific IgE to possible allergens e.g., food such as shelfish and peanuts

 Antinuclear factor (ANA) in chronic urticaria OR urticarial vasculitis

 Closed ball point pen tip is a simple test to diagnose dermographism.