Children ages 3-7 who are undergoing blood drawing receive either standard care, topical
medicine for numbing (LMX4), or the study intervention which utilizes ultrasound to speed
the onset of LMX4 from 30 minutes to 5 minutes. The child's pain with the blood drawing
procedure is evaluated.
- Ages 3-7, requiring venipuncture
- Emergent procedure
- Allergy to lidocaine or sodium lauryl sulfate