Stabilised Hemoglobin A1C control solutions prepared from non-diabetic blood in a normal hemoglobin concentration. These controls are in a proprietary buffer rendering them stable for approximately 1 year in the fridge. A stabilised concentrate of >25% HbA1C and a low level solution of <2% HbA1C, both in normal hemoglobin concentration, are available for spiking your own HbA1C controls.