Correction

Preimplantation Genetic Diagnosis by Comparative Genomic Hybridization

N Engl J Med 2002; 346:459February 7, 2002

Article

Preimplantation Genetic Diagnosis by Comparative Genomic Hybridization (Editorial, N Engl J Med 2001:345;1569 - 1571) . The sentence that begins at the bottom of page 1569 and continues on page 1570 should have read, “Currently, the most common techniques for prenatal diagnosis are amniocentesis, performed between 14 and 22 weeks' gestation, and chorionic-villus sampling, performed between 10 and 12 weeks' gestation,” not “between 14 and 20 weeks' gestation,” as printed.