The indirect Coombs test finds certain antibodies that are in the liquid part of your blood (serum). These antibodies can attack red blood cells but are not attached to your red blood cells. The indirect Coombs test is commonly done to find antibodies in a recipient's or donor's blood before a transfusion. A test to determine whether a woman has Rh-positive or Rh-negative blood (Rh antibody titer) is done early in pregnancy.
Allele frequency, or gene frequency, is the relative frequency of an allele (variant of a gene) at a particular locus in a population, expressed as a fraction or percentage. Specifically, it is the fraction of all chromosomes in the population that carry that allele.
Based on this formula, the allele frequencies of the ABO blood groups in the population was as follows: the frequency of the I o allele (r) = 0.6052 the frequency of the I a allele (p) = 0.2607 and the frequency of the I b allele (q) = 0.134.henotypic and allele frequencies ABO phenotype frequency: The sample used for estimating the allele frequencies of the ABO blood groups consisted of 12215 randomly apparently healthy Jordanian voluntary blood donors that were taken from the National Blood Bank donor registry, Amman, Jordan.