CGM directional arrows are as important to dosing as a carb ratio or correction factor. Directional arrows represent the speed at which your blood sugar is moving. Using this extra piece of information can keep you ahead of the game we call diabetes!
Simply put, if your blood glucose (BG) is 168mg/dL and rapidly rising vs 168mg/dL and rapidly falling, you should treat a meal bolus quite differently. If rising rapidly you will need to be much more aggressive with a bolus as you are chasing a higher BG trajectory. Just the opposite if you are falling quickly...you will want to back off on your bolus to avoid going too low.
Use this worksheet to make treatment decisions based on your CGM trend arrows
Food dose + Correction dose + CGM arrow = Total Insulin Dose
Step 1: Calculate your rapid-acting insulin dose for food and correction
Step 2: Add or subtract insulin based on your trend arrows