Acute Fatty Liver of Pregnancy
What is Acute Fatty Liver of Pregnancy?
Acute fatty liver of pregnancy is a rare but serious condition that affects pregnant people during the third trimester. It happens when fat builds up abnormally in liver cells, causing the liver to stop working properly. This condition is also called AFLP.
AFLP occurs in about 1 in 10,000 to 1 in 15,000 pregnancies. The condition typically appears between weeks 28 and 40 of pregnancy. Fat accumulates in tiny droplets inside liver cells, which is called microvesicular fatty infiltration. This prevents the liver from performing its essential jobs like filtering toxins and making proteins that help blood clot.
Without quick treatment, AFLP can be life-threatening for both the pregnant person and baby. The good news is that with early detection and proper medical care, most people recover fully after delivery. Understanding the warning signs and getting tested promptly can make all the difference in outcomes.
Symptoms
- Nausea and vomiting that seems worse than typical pregnancy symptoms
- Abdominal pain, especially in the upper right side where the liver sits
- Yellowing of the skin and eyes, called jaundice
- Extreme tiredness and weakness beyond normal pregnancy fatigue
- Headache that does not go away with rest
- Confusion or changes in mental clarity
- Easy bruising or bleeding that takes longer to stop
- Dark urine or very light-colored stools
- Decreased urination or swelling in hands and feet
- Loss of appetite
Some people may have mild symptoms at first that seem like normal pregnancy discomforts. This can delay diagnosis. Any concerning symptoms in the third trimester should be checked by a healthcare provider right away.
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Causes and risk factors
The exact cause of acute fatty liver of pregnancy is not fully understood. Researchers believe it may be linked to a genetic defect in how the body breaks down fatty acids. Some babies carry a mutation that affects fat metabolism, and this can trigger the condition in the pregnant parent. Hormonal changes during pregnancy may also play a role in how the liver processes fats.
Certain factors increase the risk of developing AFLP. Carrying multiples like twins or triplets raises your risk. Having a male baby slightly increases risk compared to female babies. First pregnancies are more commonly affected. People with preeclampsia or HELLP syndrome may have higher risk. Lower body weight before pregnancy has also been associated with AFLP in some studies.
How it's diagnosed
Diagnosis of acute fatty liver of pregnancy requires blood tests and clinical evaluation. Liver enzyme tests are essential, including aspartate aminotransferase or AST. In AFLP, AST levels rise quickly and dramatically due to liver cell damage. Blood tests also check for clotting problems, kidney function, blood sugar levels, and bilirubin, which causes jaundice. Low blood sugar and problems with blood clotting are common warning signs.
Rite Aid offers blood testing that includes AST measurement as part of our flagship panel. Getting tested at one of our 2,000 Quest Diagnostics locations can help monitor liver health during pregnancy. If AFLP is suspected, your healthcare provider will likely order additional specialized tests and imaging. An ultrasound or CT scan may be used to look at the liver. Early detection through blood testing is critical because this condition requires immediate medical attention and delivery of the baby.
Treatment options
- Immediate delivery of the baby is the primary treatment, regardless of gestational age
- Hospitalization in an intensive care unit for close monitoring
- Intravenous fluids to maintain hydration and blood pressure
- Blood sugar monitoring and glucose support to prevent hypoglycemia
- Blood transfusions or clotting factor replacement if bleeding occurs
- Medications to manage symptoms like nausea or blood pressure
- Liver function monitoring with repeated blood tests
- Nutritional support through IV or feeding tube if needed
- Dialysis in rare cases if kidney function is severely affected
Most people begin to improve within a few days after delivery. Liver function typically returns to normal within several weeks. Follow-up blood tests are important to confirm recovery. Future pregnancies may carry a higher risk of recurrence, so close monitoring is recommended. Working with a maternal-fetal medicine specialist can help manage care in subsequent pregnancies.
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Frequently asked questions
Acute fatty liver of pregnancy only occurs during pregnancy, usually in the third trimester. It develops suddenly and requires immediate treatment through delivery. Regular fatty liver disease develops slowly over time and is often related to diet, alcohol use, or metabolic conditions. AFLP is a medical emergency, while fatty liver disease is typically a chronic condition.
There is no known way to prevent AFLP because the exact cause is not fully understood. Genetic factors appear to play a role that cannot be changed. The best approach is early detection through regular prenatal care and blood testing. Reporting any unusual symptoms to your healthcare provider quickly can lead to faster diagnosis and treatment.
Most people recover full liver function after delivery with no permanent damage. The liver typically heals within a few weeks to months after the baby is born. Follow-up blood tests will track your liver enzymes as they return to normal ranges. In rare severe cases, complications may occur, but with prompt treatment, outcomes are generally excellent.
AST levels in AFLP are typically very elevated, often in the hundreds or even thousands. Normal AST levels are usually below 40 units per liter. A rapid rise in AST during the third trimester, especially with other symptoms, requires immediate medical evaluation. Your healthcare provider will look at AST along with other liver tests and clinical signs to make a diagnosis.
No, they are different conditions, though they can have overlapping symptoms. HELLP syndrome involves breakdown of red blood cells, elevated liver enzymes, and low platelets. AFLP involves fat accumulation in liver cells and often causes more severe clotting problems and low blood sugar. Both are serious conditions that require immediate delivery, and sometimes they can occur together.
Symptoms can develop over several days to a week. Early symptoms like nausea and fatigue may be mistaken for normal pregnancy discomforts. As the condition progresses, symptoms become more severe and include jaundice, confusion, and bleeding problems. Because the condition can worsen rapidly, any concerning symptoms in late pregnancy should be evaluated immediately.
Yes, many people go on to have successful pregnancies after AFLP. The risk of recurrence in future pregnancies is estimated at 20 to 25 percent. Close monitoring throughout pregnancy is essential, including regular blood tests to check liver function. Working with a maternal-fetal medicine specialist can help manage the pregnancy and catch any warning signs early.
Babies are typically delivered immediately once AFLP is diagnosed, often by cesarean section. Many babies are born prematurely because delivery cannot be delayed. Most babies do well after birth, though they may need care in a neonatal intensive care unit if born early. Early delivery is necessary to save both the pregnant person and the baby.
If you have risk factors, your healthcare provider may recommend more frequent blood tests in the third trimester. This might include liver enzyme checks every few weeks starting around 28 weeks. Rite Aid's testing service can help monitor liver health with AST and other biomarkers. Your doctor will create a monitoring schedule based on your individual risk factors and medical history.
With early diagnosis and immediate delivery, survival rates are very high for both mother and baby. Modern medical care has improved outcomes dramatically over the past few decades. Maternal mortality is now less than 2 percent with proper treatment. Delays in diagnosis or treatment can lead to serious complications, which is why recognizing symptoms and getting tested quickly is so important.