Diabetes mellitus is a common disorder worldwide that produces significant morbi-mortality that could be reduced with proper glycemic control.Estimate the prevalence of glycemic control in type-2 diabetic patients and explore its association with personal, clinical and familial factors.We conducted a cross-sectional study with 150 type-2 diabetic patients from a chronic diseases program at the Hospital Universitario San Ignacio in Bogota. Clinical and family (type and lifecycle) information was obtained. Adherence to treatment and family function (family-APGAR) were assessed. The prevalence of glycemic control (HbA1C <7%) was estimated and its association with determinant factors was calculated using crude and adjusted odds ratios (OR's).The prevalence of glycemic control was 49% (HbA1C <7%) and 63% when we included a different goal for patients over 71 years or with a disease lasting longer than 11 years (HbA1c 7-7.9%). Age, family function, type and adherence to treatment showed significant differences between controlled and uncontrolled patients (p < 0.04). Only family function (OR 1.3 and 7.0 for mild dysfunction and moderate/severe dysfunction respectively) and type of treatment (OR 7.2 for oral therapy and 17.8 for any therapy including insulin) showed an association with glycemic control.Family function and treatment type are relevant factors for glycemic control. A comprehensive approach for diabetes mellitus type-2 is essential to plan effective preventive and therapeutic interventions.