from Manipulation of Fetal Amniotic Fluid Volume
Published online by Cambridge University Press: 21 October 2019
The volume of amniotic fluid, for which nomograms exist [1], is the result of a balance between its production and removal. Amniotic fluid production largely reflects fetal urine production, but includes respiratory tract and oral secretions. Amniotic fluid removal relies on fetal swallowing. Fluid dynamics across the membranes are the third component of this balance. In current clinical practice a surrogate estimate for amniotic volume is made by 2-dimensional ultrasound-derived measurements of vertical cord-free liquor pools, either by amniotic fluid index (AFI) – a cumulative measurement of vertical pools made within 4 quadrants of the uterus – or by the measurement of the single deepest vertical pocket (DVP) within the uterus. Increased production or decreased removal will result in the development of polyhydramnios. The converse will result in development of oligohydramnios. The importance of these abnormalities of amniotic fluid volume is that they are a marker for fetal pathology. Their significance in isolation is limited, as are indications for their manipulation.
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