has high fructose corn syrup in it... it is not the same.

Fructose (from fruit juices or sweetened with sucrose or high fructose corn syrup) do not give the same readings as glucose would. The body has to metabolize them, and that takes TIME, so it throws off the graph and the results. TIME is important to measure the spikes and dips that occur. Using another sugar will blunt both.

The glucose tolerance test is designed to be matched to all sorts of
conditions. So the variables of intake, and testing times have to be
standardized so comparisons between people can be made (and comparisons of therapies for individuals can be measured and evaluated realistically). Over the life
of the test, doctors have learned what is happening and they make diagnoses based on those results. The test itself is not a real reflection of what happens
at home or in real life. But it measures the body's response to a known given
glucose load. For example, in reactive hypoglycemia, where a huge dip occurs, there is a trend to normalization after about 2 hrs (as the body stimulates the liver to make more glucose). The same with diabetes, there is the spike, that does not come down when it should.

Since Alan does not really show a spike on that 3 hr, I'd do a 1/2 hr after the glucose instead of 1 hr. It might show alot more if you test every 30 minutes than every 60 minutes. That is if you can afford all the strips. (Perhaps you get them free from your ACCORD program, anyway?). Make sure he drinks alot of water with the glucose tabs..so they dissolve quickly. You can even grind them up and mix in the water before hand to make a liquid.

If you get that low low dip, I'd definitely get further testing. And yes, write everything down so it is clear.

Good luck.