Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Han Scale
| Grade 0 | Ventilation by mask not attempted |
| Grade 1 | Ventilated by mask |
| Grade 2 | Ventilated by mask with oral airway or other adjuvant |
| Grade 3 | Difficult mask ventilation (inadequate, unstable, or |
| requiring 2 practitioners) | |
| Grade 4 | Unable to mask ventilate |
