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→Laboratory Tests
===Laboratory Tests===
===Laboratory Tests===
Routine haematology and biochemistry rarely show any abnormalities in dogs, but eosinophilia is often seen in cats<sup>1</sup>.
Serum based allergy tests are widely used in the evaluation of canine atopic dermatitis. However, they are often used prior to ruling out other disorders with similar clinical signs (scabies, food allergy/intolerance). Measurement of total serum IgE levels is not a useful tool for diagnosing atopic dermatitis in dogs. IgE levels are not significantly different in dogs with atopic dermatitis than in normal healthy dogs. In addition, things like routine vaccinations and the presence of ecto or endoparasites may influence serum IgE levels. Finally, there may be breed variations in serum IgE levels.
Serum based allergy tests are widely used in the evaluation of canine atopic dermatitis. However, they are often used prior to ruling out other disorders with similar clinical signs (scabies, food allergy/intolerance). Measurement of total serum IgE levels is not a useful tool for diagnosing atopic dermatitis in dogs. IgE levels are not significantly different in dogs with atopic dermatitis than in normal healthy dogs. In addition, things like routine vaccinations and the presence of ecto or endoparasites may influence serum IgE levels. Finally, there may be breed variations in serum IgE levels.