Keywords: تست عملکرد تیروئید; BW; Birth weight; CHS; Clalit Health Services; FT4; Free T4; LT4; Levothyroxine; NBS; Newborn screening; PCP; Primary care pediatrician; SCH; Subclinical hypothyroidism; T4; Thyroxin; TFT; Thyroid function test; TSH; Thyrotropin;