Two diameter pocket method
The two diameter pocket (TDP) method is an alternative method of assessing amniotic fluid volumes on ultrasound. It is however not thought to be good predictor of adverse neonatal outcome 2.
According to this method 1-2
- TDP < 15 cm2 : indicative of oligohydramnios
- TDP : 15 - 50 cm2 : usually taken as normal
- TDP : > 50 cm2 : indicative of polyhydramnios