The medical examination health certificate examines the following: frontal and lateral chest films to check for tuberculosis, and blood tests for liver function to check for glutathione transaminase and glutamic oxalacetic transaminase. Internal medicine will ask for family history of hereditary diseases, measure blood pressure, and perform auscultation of heart and lungs, and palpation of liver and gallbladder. Surgical examinations include height, weight, body mass index, thyroid, breast, and prostate. In addition, stool culture and examination of S. typhi, S. paratyphi and Vibrio cholerae are required for the health certificate. The health certificate examination is mainly for those who are engaged in the catering industry and service industry.