Pathologic Function
polyhydramnios
Subclass of:
Pregnancy Complications
Also called:
Hydramnios
Definitions related to polyhydramnios:
  • A condition of abnormally high AMNIOTIC FLUID volume, such as greater than 2,000 ml in the LAST TRIMESTER and usually diagnosed by ultrasonographic criteria (AMNIOTIC FLUID INDEX). It is associated with maternal DIABETES MELLITUS; MULTIPLE PREGNANCY; CHROMOSOMAL DISORDERS; and congenital abnormalities.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • An excess quantity of amniotic fluid in the amniotic sac as compared to normal values. Typically associated with an amniotic fluid index (AFI) of greater than or equal to 25 cm or a single maximum vertical pocket (MVP) of greater than 8 cm.
    NCI
    U.S. National Cancer Institute, 2021
  • Excessive (increased) amount of amniotic fluid. (Makris S, Solomon HM, Clark R, Shiota K, Barbellion S, Buschmann J, Ema M, Fujiwara M, Grote K, Hazelden KP, Hew KW, Horimoto M, Ooshima Y, Parkinson M, Wise LD. Terminology of developmental abnormalities in common laboratory mammals (Version 2). Part B. Birth Defects Res B Dev Reprod Toxicol. 2009 Aug;86(4):227-327.)
    CDISC Terminology
    Clinical Data Interchange Standards Consortium (CDISC), 2021
  • The presence of excess amniotic fluid in the uterus during pregnancy.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2025
  • Polyhydramnios is excessive amniotic fluid; it is associated with maternal and fetal complications. Diagnosis is by ultrasonographic measurement of amniotic fluid. Maternal disorders contributing to polyhydramnios are treated. If symptoms are severe or if painful preterm contractions occur, treatment may also include manual reduction of...
    Merck Manuals
    Merck & Co., Inc., 2025
  • Polyhydramnios (pol-e-hi-DRAM-nee-os) is the excessive accumulation of amniotic fluid - the fluid that surrounds the baby in the uterus during pregnancy. Polyhydramnios occurs in about 1 to 2 percent of pregnancies.
    Mayo Clinic
    Mayo Foundation for Medical Education and Research, 2025
  • Hydramnios, excess of amniotic fluid, the liquid that surrounds the fetus in the uterus. Chronic hydramnios, in which fluid accumulates slowly, is fairly common, occurring as often as once in 200 or 300 deliveries. Acute hydramnios, in which fluids collect quickly and cause rapid distention of t...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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