The Joint Task Force on Practice Parameters for the Diagnosis and Treatment of Asthma has revised its allergy diagnostic testing parameters. What are the parameters trying to establish? What are the advantages of intracutaneous, skin prick, and in vitro testing for diagnosing allergies? Dr. I. Leonard Bernstein, co-director of the allergy research laboratory in the department of medicine at the University of Cincinnati Medical Center, and co-author of the parameters, explores allergy diagnostic testing options with host Dr. Ketan Sheth.