<prompt> Denominator for calculating perinatal moality rate is: September 20091000 bihs1000 live bihs1000 still bihs1000 population  <response>: Ans. B: 1000 live bihs 164. Perinatal moality, defined as number of stillbihs 28 weeks of gestation and more and deaths in the first week of life early neonatal deaths per 1,000 live bihs, is a useful additional indicator, and work is ongoing to improve estimates of stillbih rates, a major component of perinatal moality. 