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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