What is the difference between the blood allergy tests and the skin testing? I was recently tested for allergies by a blood test and it came back I was allergic to cats and dogs, but I have heard this form of testing isn't always 100% and skin testing is still needed. Is this true? I have had asthma symptoms for two months now with shortness of breath & chest tightness. I have had a stress test, echocardiogram, PFT, Lung scan, CT, chest x-ray, endoscopy so far and everything normal except for reflux, ulcers in the esophagus and mild asthma. Do you think allergies could play a role? I am 29 with no history of asthma, and otherwise very healthy.