[The diagnosis of hypothyroidism in dogs with Larsson's FT4-cholesterol test]

The FT4-cholesterol test (Larsson) is able to distinguish hypothyroid from healthy dogs. In dogs suffering from nonhypothyroidal diseases the test cannot be used since the values overlap with those of hypothyroid dogs. The reason is seen in an influence of numerous other diseases resulting in hypercholesterolaemia as well as a decrease of FT4.