Is the fluid in my unborn baby's kidney a dangerous problem? Dr. Elizabeth Pryor answers the question. 

By Elizabeth Pryor, MD, FACOG
October 03, 2005


I'm 29 weeks pregnant with a boy. During my sonogram the doctor saw fluid in the kidney. What does this mean?


Fluid in the kidney is a common finding on ultrasounds, especially with boys. The fluid is usually because of the "male plumbing" and sometimes the fluid does not drain as well. So long as there is fluid around the baby and the kidneys otherwise look normal, it should not be a problem.

The doctor should measure the fluid in the kidney by ultrasound once a month to make sure that there is not increased fluid.

Usually all that is necessary is an ultrasound of the baby's kidneys once he is born.

The information on this Web site is designed for educational purposes only. It is not intended to be a substitute for informed medical advice or care. You should not use this information to diagnose or treat any health problems or illnesses without consulting your pediatrician or family doctor. Please consult a doctor with any questions or concerns you might have regarding your or your child's condition.

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