GCK and diabetes mellitus: An online tool is available at http://www.diabetesgenes.org/content/mody-probability-calculator, which has been designed to predict the likelihood of identifying a mutation in the HNF1A, HNF4A or GCK genes using basic clinical information (age at diagnosis, sex, treatment, body mass index, glycated hemoglobin, age and presence or absence of a parent with diabetes), with 75.5% the highest chance possible using this algorithm7.