This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
Most reliable test for the screening of diabetes mellitus among the following is 
Select and explain. 
A. Random blood sugar, B. Fasting blood sugar, C. Glucose tolerance test, D. Urine sugar
C: Glucose tolerance test
Answer: C: Glucose tolerance test 
Explanation: The measurement of glucose levels in random blood samples is considered unsatisfactory for epidemiological useThe fasting value alone is considered less reliable since true fasting cannot be assured and spurious diagnosis of diabetes may readily occur.For epidemiological purposes, the 2-hour value after 75gm oral glucose may be used either alone or with the fasting value.Park 23re pg: 395