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Table 3 CDCP recommendations for for needle length for intramuscular injection

From: The pharmacokinetics of epinephrine/adrenaline autoinjectors

Gender Needle length
Male Female Inch mm
lb kg lb kg
< 130 < ≈ 60 < 130 < ≈ 60 5/8–1 15.8
130–152 ≈ 60–70 130–152 ≈ 60–70 1 25.4
153–260 ≈ 70–118 153–200 ≈ 70– ≈ 90 1–1½ 25.4–38.1
> 260 > ≈ 120 > 200 > ≈ 90 38.1
  1. In older children and adolescents, 1 to 1¼ inch (25.4–33.5 mm) needle for injection in the vastus lateralis