Two diameter pocket method
Last revised by Dr Jeremy Jones ◉ on 26 Sep 2021
Citation, DOI & article data
Citation:
Radswiki, T., Jones, J. Two diameter pocket method. Reference article, Radiopaedia.org. (accessed on 10 Aug 2022) https://doi.org/10.53347/rID-14837
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rID:
14837
Article created:
30 Aug 2011 by The Radswiki ◉
Revisions:
11 times by 7 users - see full revision history
System:
Section:
Synonyms:
- Two diameter pocket (TDP) method
- Two diameter pocket
- Two diameter pocket method for assessing amniotic fluid volume
- Two diameter pocket (TDP)
- Two diameter pocket method for assessing amniotic fluid volumes
The two diameter pocket (TDP) method is an alternative method of assessing amniotic fluid volumes on ultrasound. However, it is not thought to be a good predictor of adverse neonatal outcome 2.
Sonographic assessment
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
References
- 1. Magann E, Sanderson M, Martin J, Chauhan S. The Amniotic Fluid Index, Single Deepest Pocket, and Two-Diameter Pocket in Normal Human Pregnancy. American Journal of Obstetrics and Gynecology. 2000;182(6):1581-8. doi:10.1067/mob.2000.107325 - Pubmed
- 2. Chauhan S, Magann E, Perry K, Morrison J. Intrapartum Amniotic Fluid Index and Two-Diameter Pocket Are Poor Predictors of Adverse Neonatal Outcome. J Perinatol. 1997;17(3):221-4. - Pubmed
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