Trimester-specific reference ranges for thyroid hormones of pregnant females at tertiary care hospitals in Lahore, Pakistan

Table 1 Age and GA distribution of study subjects

Pregnancy	n	Age (Years) Mean ± SD (Min—Max)	Gestational Age (Weeks) Mean ± SD (Min—Max)
1^st trimester	133	22.79 ± 3.23 (18-34)	8.79 ± 2.15 (4-12)
2^nd trimester	153	25.36 ± 3.90 (18-35)	18.94 ± 3.06 (13-24)
3^rd trimester	150	26.67 ± 4.01 (19-35)	33.06 ± 3.13 (25-39)
Overall	436	25.03 ± 4.06 (18-35)	20.70 ± 10.26 (4-39)

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