Likelihood of D heterozygosity in Mestizo Mexicans and Mexican Americans.

Information on the gene frequencies of the Rh system in the Mexican or Mexican American population is currently not available in the medical literature, thus hindering management of pregnancies at risk for development of hemolytic disease of the newborn. Data from four recent large studies in the broader scientific literature of Mestizo Mexicans and Mexican Americans is reviewed. Gene frequencies are calculated from the pooled data. A table of gene frequencies in the Caucasian and African American population is provided for comparison.