Hi dumpling
The general rule of thumb, when you've tested for a hypo, you take 15g of quick acting glusoce, this can be 3 glucose tabs, jelly babies etc... wait 15 minutes and then restest if still under 4mmol/l then take another 15g of fast acting carbs wait another 15 minutes then retest...
Once you are above the 4mmol/l then depending on the insulin regime...
If on mixed insulin, then you will need some slow acting carbs such as a couple of biscutes or sandwhich, banana ect
If on a basal/bolus regime
If you are under a hour away from eating then there should be no need to have any slow carbs, but check BG before your meal, and include a correction dose if necessary..
If you meal is going to be longer than an hour then eat some slow acting carbs...
When treating hypo, avoid sweet things such as chocolate and biscutes as this will be asorbed slower due to the fat content...
Best things to treat a hypo are
Glcose tabs
luccozade (avoid the sports type rehydration sports drinks)
jelly babies
Pure fruit juice
Sugar fizzy drinks (not diet)
I myself perfer to use jelly babies, as they are easy to measure 15g of fast acting carbs, so avoids the problem of over treating a hypo and ending up with a rebound high