The branching ratio of the two product channels of the NH2 + NO reaction, alpha and beta for the formation of N2H + OH and N-2 + H2O, respectively, have been determined independently at temperatures between 302 and 1060 K by mass spectrometry. For beta determination, the concentration of H2O was measured directly, whereas for a, the yield of OH was monitored by the CO2 formed by its reaction with added Cd. Both [H2O] and [CO2] were carefully calibrated with different standard mixtures before each measurement. a was found to increase gradually from 0.11 +/- 0.02 at 302 K to 0.30 + 0.02 at 1060 K, with the concomitant decrease of beta from 0.89 +/- 0.04 to 0.70 +/- 0.03. The two independent measurements indicate for the first time that the relationship alpha + beta = 1 holds quantitatively throughout the temperature range studied.