I don't think you need to go to a Dr., but if you don't have a kit and supplies you will need to go to a "Laboratorio de Analisis Clinicos". They do all type of blood analysis, and for some they may require a Dr. order but I believe not for blood sugar. What you are looking for is called "analisis de glucosa en sangre" or "analisis de glucemia" I know a couple that I could recommend, but not in BA , sorry. You can google and I am sure you'll find several near you. It is also posible that a "farmacia" will do the test, for sure they will have kits and supplies. Good luck