Fetal Kidney Length and Gestational Age in Late 2nd and 3rd Trimesters
Accurate GA estimation is necessary when early termination of pregnancy is necessary as soon as the fetus becomes mature e.g. cases of pre-eclampsia, chronic renal disease, severe intrauterine growth retardation (IUGR), diabetes and placenta praevia centralis. Accurate GA estimation is also necessary where certain tests need to be performed for example amniotic fluid and serum assays, chorionic villus sampling and to plan fetal therapies. (Gupta DP et al., 2013)
• All healthy women with viable normal singleton pregnancies in their late second and third trimesters (24 weeks - 40 weeks) calculated from their last menstrual period.
• Women who will sure of the dates of their last menstrual period (1st day) and/or those with first obstetrics dating using crown rump length (CRL). 3- Women with regular menstrual cycle in last three months before their last menstrual period.