Low Amniotic Fluid


Dear Ms Ultrasound,
Both of my previous pregnancies were induced at term due to low fluid when measured by ultrasound.

Both babies were delivered naturally with no problems weighing 8.5 and 7.14 lbs They are now 2 and 5 and are beautiful and healthy.

I am now in the 30th week of my third pregnancy and the technician measured my placental fluid at +- 50 mm. I would like this baby to go full term, but realize there is a risk if the fluid goes lower. What is the generally accepted cut off before a baby should be induced?

Thank you for your time,


Hi Melissa,
Your amniotic fluid volume at 50 mm is quite low. 50-70mm levels are considered low levels, which should prompt your doctor to take steps, like increasing your own fluid intake, to help you increase your amniotic fluid levels.

You may end up going in for a series of ultrasounds in the next week or so, just to measure your fluid levels. Please note that measuring the amniotic levels may differ with the technologist that is doing the exam. Sometimes having a couple different tech may change the numbers slightly.

-- Jane, RDMS

Jane Foley

Jane Foley has worked as a Sonographer (Ultrasound Technologist) since 1979. Jane has lived and worked in many parts of the world including Saudi Arabia. She is a Registered Diagnostic Medical Sonographer or RDMS. She pulls a wealth of information from her experience in the field of Radiology and her interactions with such a broad cross-section of cultures she has visited. She now makes her home on the island of Maui with her English husband, Michael.