In one couple investigated because of recurrent abortions, the female was found to have an unusual translocation between the long arm of the telomeric region of chromosome 12 and the long arm of the chromosome 14 at band q11. We studied ten additional members of the family who were under the risk of the same chromosomal rearrangement, and four of them were found to be carriers. The diagnosis of this translocation was determined using different banding techniques and FISH. The karyotype was found to be 45,XX,t(12;14)(qtel;q11).