True regarding sick euthyroid syndrome
Normal TSH, T3 , T4 level
Normal TSH, low T3, normal T4 level
High TSH, low T3, low T4 level
High TSH, low T3, high T4 level.
Hormone level in sick euthyroid syndrome usually of

Low T3 , nomal T4 , TSH – low T3 syndrome
Low T3, low T4 , normal TSH – low T4 syndrome- severe cases