To find out your m2/mg figure you can go to this site:

http://www.halls.md/body-surface-area/bsa.htm

The range endo's work from is 14-20 m2/mg. So after filling in the boxes you need to try some numbers in the m2/mg box because you already know the 30mg dose. Your figure come out as close to 17.6 m2/mg so your hc dosage level is ok. So the next thing to look at is information on dosage schedualing. 

I will not give you anything alse to think of now but the info compiled in LauraK post will give you relevant info regarding timing of doses and the reasoning behind it. Good reading. Keep asking questions.

ShaunP.