<prompt> Best method for HbA1c estimation is?Affinity chromatographyIon exchange chromatographyElectrophoresisHPLC  <response>: Ans. d HPLCFour basic types of methods are used most commonly to measure HbA1c: immunoassay, ion-exchange high- performance liquid chromatography HPLC, boronate affinity HPLC, and enzymatic assays. The gold standard is HPLC method 