When Performing Diagnostic Tests to Determine Which Environmental Allergens Cause

When performing diagnostic tests to determine which environmental allergens cause symptoms in an atopic patient, which aspects of scratch testing are preferable to other methods? (Select all that apply.)

A) It has a lower potential for anaphylaxis.
B) It is more sensitive.
C) It is safer.
D) It produces more rapid results.
E) It requires a stepwise approach.