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Table 5 Comparison of our fT3 reference intervals to previously published reference intervals (2.5, 50 and 97.5%) of different age groups.

From: Pediatric reference intervals for thyroid hormone levels from birth to adulthood: a retrospective study

   Soldin et al., 1995 Abbott IMx® Elmlinger et al., 2001 Immulite® Hübner et al., 2002 Advia Centaur® Kapelari et al., Advia Centaur®
  Age     
fT3   [pmol/L] [pmol/L] [pmol/L] [pmol/L]
   n = 1,069 n = 762 n = 460 n = 1,295
  1 d – 7 d 2.2 – 7.4 2.76 – 6.91 – 11.67 2.32 – 8.11 a F: 5.00 – 6.60 – 7.50
  8 – 15 d 2.2 – 8.4 2.84 – 5.53 – 11.86 2.40 – 7.94 b M: 4.60 – 6.30 – 10.10
  15 d – 1 m   n.d.   
  1 – 12 m 3.1 – 10.6   2.72 – 5.27 – 7.30 c F: 4.30 – 6.15 – 7.60
      M: 4.30 – 6.20 – 7.50
  1 – 2 y   3.28 – 6.08 – 11.06 3.05 – 5.63 – 6.93 F: 4.45 – 6.15 – 7.46
  2 – 3 y     M: 4.70 – 6.30 – 7.84
  3 – 4 y 3.7 – 10.3    
  4 – 5 y   3.43 – 6.57 – 10.97   
  5 – 6 y     F: 4.60 – 6.20 – 7.30
  7 – 8 4.4 – 9.2 3.58 – 6.71 – 10.75 3.30 – 5.58 – 6.79 M: 4.80 – 6.10 – 7.20
  9 – 10   3.72 – 6.44 – 10.87   
  11   3.76 – 6.13 – 9.98   
  12   3.76 – 5.88 – 8.86 3.46 – 5.54 – 6.7 F: 4.41 – 5.90 – 7.00
  13 4.8 – 9.1 3.84 – 5.64 – 8.03   M: 4.90 – 6.00 – 7.00
  14   3.81 – 5.45 – 7.28   
  15   3.69 – 5.16 – 6.87   
  16   3.61 – 4.98 – 6.88 3.57 – 5.33 – 6.65 F: 4.08 – 5.30 – 6.80
  17 5.4 – 8.8 3.54 – 4.76 – 6.60   M: 4.60 – 5.80 – 7.10
  18 – 19   3.52 – 4.65 – 6.30   
  1. a 1 d – 3 d
  2. b 4 d – 30 d
  3. c 61 d – 12 m