Projected Blood Glucose - Lows, Highs, In Range, Out of Insulin
Use the last two points to predict the time when a low will occur and how much insulin is left. For example, it could report "based on last two bg your BG will go lower than 70 at 7pm and you still have 2 hours of insulin on board! or it could report " your insulin will run out at 6:50pm when BG is expected to be 79" or "...expected to be in range at 6:30 pm", etc.. It could also alarm when the BG is predicted to be low. Or high or on target.
Now, I do this mentally: draw the line one the graph and then try to figure what time and bg reading to expect and then figure if insulin on board.