There are two sonographic techniques that are used to measure amniotic fluid for the purpose of fetal assessment: (1) the amniotic fluid index (AFI) or (2) the single deepest vertical pocket (SDP). Oligohydramnios was defined as AFI ≤ 5 cm or the absence of a pocket measuring at least 2 × 1 cm. In a population of term pregnancies and using a multicenter randomized controlled trial design, the authors found:
Measuring amniotic fluid volume remains an important part of fetal assessment. The SAFE trial (Ultrasound Obstet Gynecol, 2016), a multicentered randomized controlled trial (RCT), was designed to answer the question as to whether AFI or SDP technique is better in predicting pregnancy outcome. 1052 pregnant women at term with singleton pregnancies were included in this trial which included low risk as well as high risk indications, such as gestational diabetes (GDM), hypertensive disorder, fetal growth restriction, placental insufficiency or intrahepatic cholestasis of pregnancy.
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