This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sensitivity, Specificity, PPV, NPV, Subject name: Social & Preventive Medicine
Positive Screening test for Diabetes Mellitus:- 
Select and explain. 
A. RBS > 200mg/dl, B. GTT > 200mg/dl, C. HbA1C > 6.5 %, D. FBS > 126 mg/dl
A: RBS > 200mg/dl
Answer: A: RBS > 200mg/dl 
Explanation: Screening test is a search for an unrecognized disease/defect in Apparently healthy individuals by means of RAPIDLY APPLIED TESTS. RBS is used for screening of Diabetes mellitus. Rest all tests are diagnostic tests. Screening tests of impoant diseases: Leprosy - Hypoanesthesia HIV - ERS Breast cancer - Mammography Cervical cancer - Visual inspection with 5% acetic acid > PAP smear Prostate cancer - PSA + DRE > PSA > DRE Lung cancer - chest X-ray Oral cancer - Bimanual oral palpation.