3. Materials and Methods
This was a prospective observational study conducted at the
Department of Obstetrics and Gynaecology, Kasturba Medical
College, Manipal, from January 2012 to December 2012.
Institutional ethical committee approval was obtained prior
to study. Inclusion criteria were low risk singleton pregnancy,
starting gestational age of 34 weeks, reliable last menstrual
period and dates correlated and confirmed by comparison
with first trimester CRL (Crown Rump Length). Once initial
criteria were met, those who were subsequently diagnosed to
have abnormalities of liquor volume due to conditions such
as hypertensive disorders, gestational diabetes, and placental
insufficiency were excluded from the study, so as to obtain
normative data. Only those patients who delivered at 40
weeks were included in the study as we wanted longitudinal
data till term. The final study subjects were 50 low risk pregnant
women who underwent serial scans at weekly interval
starting from 34 weeks till term.