Cheryl,

Here is the site for calculating m2 (or body surface). http://medicine.ucsd.edu/cystinosis/bodysurf.htm

FYI:  There are two ways to calculate m2, the numbers are just slightly different. It depends on wether you "weight" the weight or the height more. I used to calculate mg/m2/day using both formulas but the differences were so very small I just starting using the m2 from this web site because it was very easy and quick.

When was your son born? 9mg/day is close to the dose my son was on before we started all this oversuppression stuff. Have your son's levels been pretty well controlled?

Hope the site helps.

-Chris