The A1C test monitors glucose levels for up to three months while diagnosing diabetes, states Healthline. A1C test scales also work in conjunction with daily fingersticks and urine tests to monitor blood sugar levels in diabetics. A1C tests do not require the individual to fast for usable results.
An A1C test result can be slightly higher or lower than the actual blood sugar level, warns Healthline. False results can occur if an individual is in kidney failure, has liver disease or is severely anemic. Normal A1C readings in a nondiabetic is below 5.7, 5.7 to 6.4 indicates prediabetes, and 6.5 typically means that an individual has diabetes.