When is the best time to have a child tested for diabetes?

Whenever needed: Good reasons for testing for diabetes vary depending upon circumstances. A child who seems to be eating a lot but losing weight, abnormally thirsty and urinating a lot, or with sudden blurred vision should be checked immediately. With risk factors for type 1 diabetes (family history, other autoimmune diseases) or type 2 diabetes (family history, obesity, dark skin patches) screening may be needed.

Whenever there are: Anytime there are symptoms suggestive of diabetis, like excessive drinking, eating, weight loss, urinating alot you need to check with your doctor about diabetis.