A 6 month old infant is brought with a history of constipation and excessive sleepiness. On exmination, he is lethargic, has periorbital puffines, large tongue and umbilical hernia. The investigation which will help to diagnose this condition is ?
Ans. is 'a' i.e., T4 TSH assary o It is typical presentation of hypothyroidism.
T4 TSH assay
Karyoptyping
Rectal mucosal biopsy
Knee X ray