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. 2022 Apr 6;6(6):bvac054. doi: 10.1210/jendso/bvac054

Table 1.

Medians and ranges of the serum thyrotropin, free triiodothyronine, and free thyroxine levels each month

TSH (mIU/L)
median (range)
FT3 (pg/mL)
median (range)
FT4 (ng/dL)
median (range)
n
January 1.61 (0.51-5.22) 2.97 (2.35-3.55) 1.00 (0.83-1.20) 628
February 1.52 (0.39-5.11) 3.14 (2.48-3.64) 1.04 (0.86-1.26) 651
March 1.45 (0.49-4.82) 3.10 (2.37-3.64) 1.04 (0.83-1.29) 554
April 1.28 (0.46-4.61) 3.35 (2.46-3.70) 1.00 (0.82-1.22) 382
May 1.16 (0.37-4.02) 3.32 (2.64-3.70) 1.00 (0.81-1.21) 248
June 1.17 (0.43-3.63) 3.37 (2.75-3.68) 1.02 (0.83-1.25) 370
July 1.23 (0.41-4.30) 3.39 (2.79-3.70) 1.03 (0.83-1.30) 452
August 1.24 (0.41-3.44) 3.29 (2.43-3.69) 1.02 (0.84-1.29) 586
September 1.26 (0.45-3.69) 3.00 (2.37-3.50) 1.03 (0.82-1.28) 551
October 1.30 (0.41-4.08) 3.00 (2.33-3.56) 1.04 (0.85-1.31) 610
November 1.30 (0.38-3.86) 3.05 (2.39-3.58) 1.04 (0.84-1.32) 576
December 1.34 (0.46-4.10) 3.01 (2.36-3.62) 0.99 (0.81-1.21) 735
All 1.34 (0.43-4.27) 3.13 (2.44-3.66) 1.02 (0.83-1.27) 6,343

Range represents 2.5th to 97.5th percentiles.

Abbreviations: FT3, free triiodothyronine; FT4, free thyroxine; TSH, thyrotropin.