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  Indian J Med Microbiol
 

Figure 1: The profiles and trends of reference interval during three trimesters for thyroid stimulating hormone (a), free thyroxine (b), and free triiodothyronine (c) derived from 86 normal pregnant women with a comparison of 124 normal nonpregnant women. For all graphs, the bottom line indicates the lower reference limit (2.5th percentile), the middle line is the median level (50th percentile), and the top line is the upper reference limit (the 97.5th percentile). On horizontal axis, NP: Nonpregnancy; first, pregnancy at the first trimester; second, pregnancy at the second trimester; third, pregnancy at the third trimester

Figure 1: The profiles and trends of reference interval during three trimesters for thyroid stimulating hormone (a), free thyroxine (b), and free triiodothyronine (c) derived from 86 normal pregnant women with a comparison of 124 normal nonpregnant women. For all graphs, the bottom line indicates the lower reference limit (2.5<sup>th</sup> percentile), the middle line is the median level (50<sup>th</sup> percentile), and the top line is the upper reference limit (the 97.5<sup>th</sup> percentile). On horizontal axis, NP: Nonpregnancy; first, pregnancy at the first trimester; second, pregnancy at the second trimester; third, pregnancy at the third trimester