I'm not so sure about this guy's numbers...
He has this in his typical sliding scale example (scroll down):
For a blood sugar reading of < 50, give 4 units of insulin
For a blood sugar reading of 51 to 110, give 5 units of insulin
I've never seen a sliding scale that would recommend injecting ANY insulin when your blood glucose is at 70 or less, much less under 50...?!?