DETERMINACIÓN DEL SEXO FETAL POR ECOGRAFÍA, SIGNO DE LA HAMBURGUESA, SIGNO DE LA TORTUGA, SEXO FETAL

Ultrasound determination of fetal sex in the second trimester is primarily based on the demonstration of the penis and scrotum in male fetuses and the labia majora and minora in female fetuses. However, at earlier gestational ages, these signs are not useful because there is no significant difference in the size of the penis or clitoris before week 14. Advances in ultrasound technology in recent years have led to the suggestion of determining fetal sex during the first trimester based on the direction in which the genital tubercle points (1) (cranial in males, caudal in females) or on the identification of the "sagittal sign," which determines the presence of a caudal notch in females or a cranial notch in males, when the midsagittal plane is examined (2). Early identification of fetal sex by ultrasound can help prevent unnecessary invasive procedures in patients at risk of X-linked diseases, such as hemophilia or Duchene muscular dystrophy, since invasive diagnosis would only be necessary in pregnancies carrying male fetuses.