Background. Diabetes mellitus (DM) is a chronic metabolic disease characterized by high levels of blood glucose. The increasing prevalence of DM should be balanced with adequate treatment. Regarding the long duration of diabetic treatment, patient’s medical adherence is essential to the effectiveness of pharmacological treatment and glycemic control. Objectives. The aim of this research is to determine the relationship of medical adherence on blood glucose levels among type-2 diabetic patients in Atma Jaya Hospital. Methodology. This analytical observation study was conducted in January 2014 until October 2014 using the consecutive sampling method. This study was carried out among type-2 diabetic patients in Atma Jaya Hospital. Adherence was measured by using Morisky 8-Items Medicaton Adherence Scale (MMAS-8) questionnaire, while the blood glucose levels was observed thorough medical records. Data analysis was performed using chi-square test with 95% confidence level (a=0,05). Results and Conclusions. The MMAS-8 showed that 35,9% of respondents were adjudged high adherent, 30,8% medium adherent and 33,3% low adherent. Of the respondents with high adherence, 71,4% had blood glucose level =144 mg/dL was higher than their medium adherent and low adherent counterparts 41,6% and 15,4%. Also in fasting plasma glucose (FPG) levels, the percentage of high adherent respondents whose FPG =100 mg/dL is 64,3%, was higher than their medium adherent and low adherent counterparts 50% and 15,4%. Chi-square test result showed that there is a significant correlation between the patient’s adherence and blood glucose levels (p=0,013) also FPG (p=0,033) among type-2 diabetic patients in Atma Jaya Hospital. Suggestion. The suggestion is to assess adherence with multiple methods. Measurement of HbA1c should be planned in advance so that the amount of data needed can be met. Similar research should be conducted with a wider scope |