From: Asthma biomarkers in the age of biologics
Age
Reference interval (IU/mL)
6–12 months
2–34
1–2 years
2–97
3 years
2–199
4–6 years
2–307
7–8 years
2–403
9–12 years
2–696
13–15 years
2–629
16–17 years
2–537
≥ 18 years
2–214