The ultrasound examination was carried out after instructing the patient to empty her bladder. The examinations were performed with a convex 3.5MHz probe (Philips HD11XE ultrasound equipment). The patient was asked to lie down in supine position. Uterus was arbitrarily divided into four quadrants using linea nigra as a vertical line and a transverse line passing through umbilicus, as described by Phelan et al. [9].Thetransducer was placed in each of these quadrants
in sagittal plane perpendicular to patient’s abdomen and maximumdepth of amniotic fluid was calculated in centimeters excluding the cord loops and small fetal parts. Caution was exercised to avoid excessive pressure on the transducer as it can alter AFI measurements. The values of all four quadrants were added to obtain the final amniotic fluid index (AFI).