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

Table 3 Reference ranges of TSH across different trimesters: Comparison of different studies

Country	Year	Number of Patients (n=)	1^st Trimester	2^nd Trimester	3^rd Trimester	Authors
Iran	2005	229	1.71 + 1.38	1.89 ± 1.24	2.12 + 0.77	Zarghami et al. [26]
India	2008	541	0.6 - 5	0.435 - 5.78	0.74 - 5.7	Marwaha et al. [27]
China	2013	2743	0.06 - 3.13	0.07 - 4.13	0.15 – 5.02	Zhang et al. [28]
Pakistan	2008	384	0.05 - 2.8	0.16 - 3.3	NA	Gilani et al. [29]
Current study			1.376 ± 0.982	1.62 ± 1.04	1.64 ± 0.99
Current study			0.16 - 0.29	0.258 - 4.58	0.34 - 4.62

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