Diabetic is a controllable desease so there is no greater impact on imposing restrictions in taking up a positin in any companies and even the test date you can take ur regular medicine such as glucophage and all that disable the lab. discovery of the suger content in the blood also avoiding taking much sweets on the same day. The desease is honourable ones, and if not respected, that make havoc in ur life., so take care and good luck.