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. 2015 Nov;36(4):109–126.

Table 6.

TSH 2.5th and 97.5th percentiles for each trimester in healthy women using the Siemens Centaur. Study details in Table 5.

Study TSH mIU/L FT4 pmol/L
First Second Third First Second Third
2.5th 97.5th 2.5th 97.5th 2.5th 97.5th 2.5th 97.5th 2.5th 97.5th 2.5th 97.5th
C1 0.06 3.50 10.9 17.9
C2 0.06 3.67
C3 0.04 3.60
C4 0.08 2.67 12.4 20.3
C5 0.22 3.34 11.8 18.4
C6 0.03 4.51 0.05 4.50 0.47 4.54 11.8 21.0 10.6 17.6 9.2 16.7
Mean 0.08 3.55 0.05 4.50 0.47 4.54 11.8 19.4 10.6 17.6 9.2 16.7
SD 0.08 0.46 0.52 1.7