Índice Líquido Amniótico (ILA)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
normal 8-18
About this calculator
The Amniotic Fluid Index (ILA) is an important measure to assess fetal health during pregnancy. It is calculated by summing the 4 quadrants of the amniotic fluid in an ultrasound.
To calculate the ILA, it is necessary to perform an ultrasound and measure the 4 quadrants of the amniotic fluid. The result is expressed in centimeters.
It is recommended that the ILA be evaluated by a qualified health professional, as the interpretation of results may vary depending on the individual situation of the pregnancy.
An ILA of 8 to 18 cm is considered normal, while values below 8 cm may indicate risk for the baby and values above 18 cm may indicate risk for the mother.
Frequently asked questions
When is the evaluation of ILA necessary?
The evaluation of ILA is recommended in all pregnancies, especially in women with a risk of pre-eclampsia, diabetes or other health complications.
What does an ILA below 8 cm mean?
An ILA below 8 cm may indicate risk for the baby, suggesting that the baby is receiving insufficient amniotic fluid.
What does an ILA above 18 cm mean?
An ILA above 18 cm may indicate risk for the mother, suggesting that there is an excessive amount of amniotic fluid.
How can I prepare for the ILA evaluation?
It is recommended that you stay well-hydrated and have had a bowel movement before the ultrasound.
What complications are associated with an abnormal ILA?
An abnormal ILA may be associated with complications such as pre-eclampsia, diabetes, infections and other health problems.