Each drop of fluid is from a separate bottle and each contains the proteins from a separate cause of allergy symptoms. Your doctor keeps track of where each drop of fluid was placed by keeping a careful chart or by writing a code on your back or arm. Many patients complain that their back or arm feels ticklish or itches during this time, but scratching is not permitted. Your doctor will examine each scratch for redness or swelling at the end of the waiting time. Your doctor will decide on the number and types of allergies that will be tested.
Some patients have as many as a few dozen tested at one visit.