<unk>  Stimulation Test (CST) is main diagnostic test
Ice cube (or other object at 0-4° C) placed on forearm for 5 minutes
Test is positive if weal develops after 5-10 minutes of rewarming
Consider lab testing:
CBC if suspect infection
C1 esterase inhibitor level in cases of angioedema
ESR/CRP if suspect underlying autoimmune disease
Ice cube (or other object at 0-4° C) placed on forearm for 5 minutes
Test is positive if weal develops after 5-10 minutes of rewarming
CBC if suspect infection
C1 esterase inhibitor level in cases of angioedema
ESR/CRP if suspect underlying autoimmune disease
Cold urticaria
Allergic reaction/urticaria
Chronic urticaria
Anaphylaxis
Contact dermatitis
Angioedema
Drug rash
Anxiety attack