Premium
How accurate is second trimester fetal dating?
Author(s) -
Hadlock F P,
Harrist R B,
Martinez-Poyer J
Publication year - 1991
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.1991.10.10.557
Subject(s) - medicine , fetus , confidence interval , second trimester , fetal head , singleton , pregnancy , obstetrics , genetics , biology
In this study, the Hadlock models for fetal dating using single and multiple parameters were tested retrospectively in 1770 chromosomally normal singleton fetuses in the second trimester (14 to 21 weeks of fetal development). The 95% confidence interval using measurements of the fetal head and femur individually was approximately +/‐ 1 week, which is comparable to the results of recently published dating models from other centers designed specifically for use during this time frame. The use of multiple‐parameter models results in statistically significant improvement in prediction of age, in terms of both random error and maximum observed errors. We conclude that these models, developed for dating between 14 and 42 weeks of fetal development, provide highly accurate estimates of fetal age in the second trimester of pregnancy.