[en] The Medical Physics Calibration Laboratory has been accredited in accordance with MS ISO/IEC 17025 since 2013, with the scope to provide calibration service of diagnostic dosemeter, except mammography. In order to ensure continual improvement of our service, the customer satisfaction survey is carried out every year, except in 2015 where the laboratory was not operated within the ISO scope. This paper reports the results of the customer satisfaction survey from 2013 to 2020 based on approximately 33 % of customer feedbacks that we received each year. The result shows that the average customer satisfaction index from 2013 to 2020 is 81 %. From 2016 to 2020, the results are maintained more than 80 %, in which the clean working environment and counter services are always received positive feedback from the customers. Out of 5, the customers gave an average satisfaction index of 4 for the 12 criteria that are assessed in this survey. From the gap analysis, three criteria are identified to be prioritized for improvement which are handling payment efficiency, accessibility to personnel and follow-up calls. In conclusion, the laboratory is committed to taking the best corrective action incommensurate with the customer feedback to keep up our excellent service. (author)