<unk>  is diagnosed using any of three tests - the presence of quadriradial (Qr, a four-armed chromatid interchange) in cultured<unk>  lymphocytes, and/or the elevated levels of sister chromatid exchange in cells of any type, and/or the mutation in the BLM gene. The US Food and Drug Administration (FDA) announced on February 19, 2015 that they have authorized marketing of a direct-to-consumer genetic test from 23andMe. The test is designed to identify healthy individuals who carry a gene that could cause<unk>  in their offspring.
Bloom syndrome
Plummer–Vinson syndrome
Schnitzler syndrome
Secretan's syndrome
Galloway Mowat syndrome
Mucus fishing syndrome
Naegeli–Franceschetti–Jadassohn syndrome
König's syndrome