Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Problems with Smell ?
    ### Response:
    Scientists have developed tests to determine the nature and extent of a person's smell disorder. Tests measure the smallest amount of odor patients can detect as well as how accurately a person can identify different smells. An easily administered "scratch and sniff" test allows a person to scratch pieces of paper treated to release different odors, sniff them, and try to identify each odor from a list of possibilities.
    