Low Amniotic Fluid (Oligohydramnios)

• Amniotic fluid is like a baby’s personal pool.
• It protects the baby by acting as a cushion from outside pressure. It also allows the muscles and bones to develop healthily.
• The fluid also helps a baby “practice” the respiratory and digestive systems as they are developing.

Oligohydramnios describes a pregnancy problem where a woman’s amniotic fluid is less than what’s normal for her gestational age. A clear understanding of its causes and being aware of the associated symptoms is important. Knowing how medical staff assess amniotic fluid levels can be of great help to the parents.

For most of the time during pregnancy, healthcare professionals assess amniotic fluid levels on a regular basis through ultrasound scans. These assessments help medical personnel to determine the risk that the fetus has. In other words, they can determine if they need to conduct further investigations or even interventions to help the baby’s well-being.

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What Is Low Amniotic Fluid (Oligohydramnios)?

As a woman’s pregnancy progresses, the fluid in the amniotic sac increases. At first, the mother’s body mostly provides this fluid, which the baby transforms into its own liquid through swallowing and urinating over time.

In the condition known as oligohydramnios, the level or volume of the fluid is much less than normal. AFI is a very popular method for determining a pregnant woman’s level of amniotic fluid via a routine ultrasound:

An amniotic fluid index (AFI) measures fluid levels from the uterine area into four pockets, which a doctor visually inspects. Generally speaking, an AFI less than 5 cm is an indication of oligohydramnios.

A Maximum Vertical Pocket (MVP) is another test that measures and identifies the deepest pocket of amniotic fluid in the uterus at a glance. A depth less than 2 cm indicates the level is low or insufficient.

Besides occurring at any stage, the most typical diagnostic situation for detecting low amniotic fluid is the third trimester of pregnancy.

Causes of Low Amniotic Fluid

Low levels of amniotic fluid can happen due to problems in the mother’s health, baby’s condition, or the placenta.

• Rupture of Membranes at the Wrong Time (PROM): The amniotic sac is a protective bubble that your baby develops in, and if there’s a tear or a leak, then part of the fluid can escape before labor.
• Placental Problems: should the placenta fail to adequately supply the baby with blood and nutrients, it will lead the baby to produce less urine and so decrease the amount of amniotic fluid.
• Extended gestation: Fluid volume starts to go down naturally beyond 40 weeks of pregnancy. Extended pregnancies lasting past 41 or 42 weeks have a greater likelihood of developing low amniotic fluid levels (oligohydramnios).
• Chronic hypertension, preeclampsia, diabetes, and dehydration in a mother can all affect the flow of blood and fluid levels.
• Baby’s structural Birth Defects: Rarely, structural abnormalities that a baby may have, like those affecting the kidneys or urinary tract, are among the factors that may prevent it from urinating sufficiently.
• You must take certain prescription medicines, such as ACE inhibitors used for blood pressure and NSAIDs, directly under a doctor’s supervision to reduce fluid levels.

Signs and Symptoms to Watch For

Oligohydramnios generally doesn’t cause significant symptoms, and most of the time a healthcare provider diagnoses the condition through a regular prenatal ultrasound. In rare cases, a woman might encounter some of these signs:

• A runny feeling down there that might be a sign of a torn amniotic sac
• A doctor or midwife might say that your bump is smaller than it should be given the number of weeks since the first missed period.
• If there’s any sudden reduction in the kicks your baby gives you
• Gaining less weight compared to how a pregnant person your age and weight might be expected to
• Should you see some sort of liquid leak or you’ve felt the baby kick a whole lot less than before over a short period of time, you need to get in touch with your OB or midwife as soon as possible.

Complications Associated with Oligohydramnios

Risks related to low quantity of amniotic fluid are highly dependent upon the time of development and extent of depletion during pregnancy.

First and Second Trimesters

Diagnosis of oligohydramnios before the 24th week of pregnancy is rare, though it is the case where the most severe risks are present, such as:

• Miscarriage or stillbirth
• Compression of fetal organs can mean birth defects in the newborn or pulmonary hypoplasia

Third Trimester

There are several main risks with low amniotic fluid late in pregnancy. First of all, the main problem areas here are labor and delivery:

• Umbilical Cord Compression: When there is less amniotic fluid to support the baby’s movements, there is a higher chance of the baby compressing the umbilical cord during movements or contractions. When this happens, the baby’s oxygen supply gets temporarily affected.
• Increased Likelihood of Cesarean Delivery: If the baby compresses the umbilical cord during labor, he may experience fetal distress. In some cases, that might cause the need for an emergency C-section.
• Intrauterine Growth Restriction (IUGR): Insufficient amniotic fluid may be a result of compromised placental flow, which is a risk for growth problems of the unborn baby.

How Is Low Amniotic Fluid Managed?

Management depends on the gestational age of the baby, the underlying cause, and how well the baby is tolerating the condition.

At-Home Care and Self-Care Support

• Sufficient hydration: research states that getting the right amount of oral fluids (drinking lots of water) can help enhance the amniotic fluid temporarily in some late-pregnancy cases.
• Rest: it may help to improve blood circulation to the placenta by taking more rest and avoiding heavy physical exertion.

When to Contact Your Doctor

Never hold back from letting your doctor know about the different changes you may have noticed in your body that are quite different from the norm. You should also call your healthcare provider right away if you are having:

• Fluid running out or dripping from the vagina in large quantities
• Sudden big or drastic changes in fetal movement
• Painful contractions that happen regularly and come even before 37 weeks
• Bleeding from the vagina or severe abdominal pain

Having a safe delivery that also protects the baby as well as the mother largely depends on detecting and managing low amniotic fluid as early as possible. This is done mainly via prenatal care that is regular and routine.