The fructosamine test aims to estimate your blood glucose levels over the last two to three weeks in order to determine how well your diabetes is being managed. Monitoring your blood glucose levels is crucial to controlling diabetes and avoiding the health issues that can result from it. An alternative to the more popular haemoglobin A1c test is a fructosamine test. If you have a medical condition that makes the haemoglobin A1c test unreliable or if your doctor wants to monitor your blood sugar over a shorter period of time, this test may be recommended.