It's pretty good with its predictions. You have always have to bear in mind the difference from blood glucose readings and consider that that can skew it a little, but I've been impressed over the last 15 months. Mine's usually been within 0.2%.I noticed on the Libre's computer software that it predicts your HbA1c. Has anyone had an HbA1c since they've had the Libre and was it consistent with what the software predicted?