Abdominal transverse diameter
The Abdomentransversaldurchmesser ( ATD , also: Abdomenquerdurchmesser , AQD ) is a measured value of the fetometry ( lat. Abdomen , stomach "). In the context of prenatal diagnostics , this measured value indicates the diameter of the belly of the fetus (measured from right to left) below the child's heart. It can be determined during ultrasound examinations in order to calculate the abdominal circumference from it and the anterior-posterior diameter (APD, measured from the navel to the spine ) and thus determine whether the fetus has developed on time or whether there is an intrauterine growth retardation . In combination with other measured values - especially with the head circumference and the length of the thigh bone - the body weight of the fetus can be estimated.
The transverse abdominal diameter can be larger than normal when the mother is e.g. B. has diabetes; lower values can be a sign that the fetus is e.g. B. is malnourished as a result of changes in the placenta .