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This tool finds "Correction Bolus" entries (insulin only, no carbs) and compares the expected BG drop (from your ISF) with the actual BG drop 3 hours later. It automatically discards data contaminated by new carbs, insulin, or exercise within the 3-hour window.
This tool finds "Clean Meals" (carbs & insulin, no prior IOB, no post-meal rescue carbs/bolus) and checks if you land back at your starting BG 4 hours later.
Positive Error: Ended higher than start (CR may be too weak).
Negative Error: Ended lower than start (CR may be too strong).