Table 4 Summary of existing paediatric reference intervals for FT4 using direct sampling approach.
Published paediatric reference intervals | This study (11 months − 18 years) | |||
|---|---|---|---|---|
Source | Age | Reference intervals | ||
Beckman | Adeli et al.14 | 20 days–<3 years | 9.5–17.8 | 9.8–17.9 |
3–19 years | 7.8–13.6 | |||
Siemens | Kapelari et al.23 | 1–12 months | 9.2–25.3 | 12.8–22.3 |
1–5 years | 10.5–22.4 | |||
6–10 years | 10.6–20.9 | |||
11–14 years | 10.4–21.4 | |||
15–18 years | 10.6–22.6 | |||
Roche | Taylor et al.24 | 7 years | 12.7–19.3 | 11.3–24.1 |
15 years | 11.9–20.3 | |||
Abbott | Adeli et al.14 | 30 days–<1 year | 11.4–21.9 | 14.9–26.2 |
1–<19 years | 11.4–17.6 | |||
Vitros | Adeli et al.14 | 2 weeks–<5 years | 11.4–29.2 | 11.7–19.7 |
5–<19 years | 9.7–17.1 | |||
