Dor Yeshorim is based in Brooklyn, New York, but has offices in Israel and various other countries. It announces testing sessions in community newspapers and Orthodox Jewish high schools as well as on its website.
Orthodox Judaism generally frowns on selective abortion. Although preimplantation genetic diagnosis (PGD) is often approved by Halakha, it is a difficult and costly process. By avoiding the marriage between "carriers", the incidence of the disorders decreases without having to resort to such methods.
Dor Yeshorim advocates anonymous testing. Individuals are tested during large sessions in Jewish schools and processed anonymously with only a PIN linking the sample with the candidate.
At present, testing is offered for the following disorders:
When two members of the system contemplate marriage, they contact the organization and enter both their PINs. When both carry a gene for the same disorder, the risk of affected offspring is 25%, and it is considered advisable to discontinue the plans. In the context of shidduchim, the "carriership check" is often run within the first three dates, to avoid disappointments and heartbreak. Ideally, it should be checked prior to the first date, as there are no charges applied to any particular query; however, there is a strange hesitation to contact the organization until the couple are considering further dates.
Another criticism that is being leveled against the method used by Dor Yeshorim is its resemblance to eugenics. However, the program is not intended to affect allele frequency, but rather the occurrence of homozygosity.
Additionally they only test for recessive disorders that require two carriers, and thus are only concerned with eliminating the incidence of active cases of the disease. The testing preserves heterozygote frequency at constant levels because it does not allow selection to remove the deleterious alleles from the population in the form of homozygous recessive individuals. They will not test for disorders that manifest with only one carrier. (See Policy section above.)