Updated: 22Jun2016
A corrected diagram is available for download. [PDF 632KB]
Updated: 01Nov2017
Stage 2, second column
Description of FRONT NECK DEPTH was omitted. The following text should appear with it.
In most adults this measurement is about 3″. Plot down from sides of back neck width, and curve the line at front.
This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.
Strictly Necessary Cookie should be enabled at all times so that we can save your preferences for cookie settings.
If you disable this cookie, we will not be able to save your preferences. This means that every time you visit this website you will need to enable or disable cookies again.