The diagnosis of euthyroid<unk>  syndrome is based on clinical presentation and thyroid function tests. An important part in diagnosing euthyroid<unk>  syndrome is to be able to differentiate between other causes of hypothyroidism and euthyroid<unk>  syndrome. Although  the diagnosis of hypothyroidism is mainly a laboratory diagnosis, the coexisting conditions and wide variation in clinical presentation may make the diagnosis difficult. The best initial test is TSH, which in euthyroid<unk>  syndrome can be low, normal, or elevated but not as high as it would be in hypothyroidism. Serum reverse T3 is elevated from inhibition of 5' monodeiodinase(type I). Patient having severe underlying illness, as in euthyroid<unk>  syndrome have elevated levels of serum cortisol from underlying stress whereas patients of hypothyroidism have low serum cortisol from associated hypothalmic/pituitary abnormality.
Euthyroid sick syndrome diagnostic criteria
Euthyroid sick syndrome laboratory findings
Hypoglycemia diagnostic criteria
Euthyroid sick syndrome epidemiology and demographics
Riedel's thyroiditis diagnostic criteria
Insulinoma diagnostic criteria
Brugada syndrome diagnostic criteria
Sheehan's syndrome diagnostic criteria