Embodiments of the present invention relate to a buffer composition for an integrated nucleic acid amplification and hybridization reaction. The buffer comprise about 50-200 mM of a salt, about 10-30 mM Tris-HCl, about 2-10M Water soluble magnesium salt, about 0.05-1.5% surfactant, about 0.05-0.15 mg/ml stabilizing protein about 50-300 nM of one or more primers, about 20-150 uM of one or more dNTPs, about 5-15% glycerine, about 0.5-1.5% formamide and at least about 5 unit/ml polymerase.