Diane W. Shannon, MD, MPH
Polyhydramnios is too much fluid in the amniotic sac. The amniotic sac is the water bag inside the uterus that cushions and protects your baby. It also allows normal growth and development to occur. Normal amniotic fluid levels vary. The average volume during pregnancy is almost one liter at 36-37 weeks. In severe cases, the condition can result in:
In most cases, the cause of polyhydramnios is not known. In others, causes may include:
The presence of a known cause of polyhydramnios increases the risk of developing it.
If you have mild polyhydramnios, you may not have any symptoms. When symptoms do appear, they may include:
Your doctor will ask about your symptoms and medical history. A physical exam will be done.
Your doctor will do an
to view the uterus and fetus. Measurements of the fluid levels will be taken. The fetus will also be closely looked at for any signs of problems.
Your doctor may do other tests including blood tests to check for health problems in the mother. Other tests may be done to look for problems with the fetus's health.
Your doctor will monitor you and your baby closely to make sure the condition does not get worse and that the fetus remains healthy. You will probably have more frequent prenatal visits and regular ultrasound tests. It is very important to keep these appointments.
Your doctor will suggest a treatment plan based on your due date and the amount of amniotic fluid. If treatment is needed, options include the following:
The only way to prevent polyhydramnios is to treat its causes if possible. Make sure to get proper care before, during, and after pregnancy. This may include:
American Pregnancy Association
The American Congress of Obstetricians and Gynecologists
Canadian Women's Health Network
The Society of Obstetricians and Gynaecologists of Canada
Amniotic fluid abnormalities. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T905317/Amniotic-fluid-abnormalities. Updated March 29, 2017. Accessed April 7, 2017.
Polyhydramnios. March of Dimes website. Available at:
http://www.marchofdimes.org/complications/polyhydramnios.aspx. Updated June 2012. Accessed April 7, 2017.
Practice Bulletin No. 175: ultrasound in pregnancy. Obstet Gynecol. 2016;128(6):e241-e256.
Prenatal ultrasound screening. EBSCO DynaMed Plus website. Available at:
http://www.dynamed.com/topics/dmp~AN~T115088/Prenatal-ultrasound-screening. Updated February 5, 2016. Accessed April 7, 2017.
Last reviewed April 2017 by Andrea Chisholm, MD
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