The determination of fructosamine levels in at least part of a blood sample for use in detecting diabetes in patients or deciding treatment levels is effected by controlling the temperature and pH of the sample, adding a coloring agent such as a nitro-blue tetrazolium and after a first delay in time...http://www.google.com.au/patents/US4642295?utm_source=gb-gplus-sharePatent US4642295 - Methods of determining fructosamine levels in blood samples