ICP, or intrahepatic cholestasis of pregnancy, is a liver disorder that causes intense itching during the second half of pregnancy. It happens when bile acids, substances your liver normally processes and sends to your gut, build up in your bloodstream instead. For most people with ICP, the condition is manageable with monitoring and treatment, but higher bile acid levels carry risks for the baby that make early detection important.
What Causes ICP
During pregnancy, rising hormone levels can slow the normal flow of bile from your liver. When bile doesn’t move through the liver’s drainage system efficiently, bile acids leak into your bloodstream. The exact reason this happens to some pregnant people and not others isn’t fully understood, but genetics play a role. If your mother or sister had ICP, your risk is higher. It also recurs frequently: among those who had ICP in one pregnancy, roughly 44% develop it again in a later pregnancy, though estimates range from 40% to 90%.
How ICP Feels
The hallmark symptom is severe itching that typically starts on the palms of your hands and the soles of your feet, then spreads to other parts of your body. This isn’t the mild, stretching-skin itch many pregnant people experience. It’s persistent, often worse at night, and can be intense enough to disrupt sleep. There’s usually no visible rash, just the itch itself, which is what makes it easy to dismiss early on.
A small number of people with ICP develop jaundice, a yellowing of the skin and the whites of the eyes. Dark urine and pale stools can also occur, though these signs are less common. The itching alone, especially if it starts in the third trimester and focuses on the hands and feet, is enough reason to ask for testing.
How ICP Is Diagnosed
Diagnosis relies on a blood test measuring your total serum bile acid level. Normal bile acid levels in pregnancy stay below about 10 to 14 micromol/L. Levels above that threshold, combined with the characteristic itching, point to ICP. Your provider will also check liver enzymes (ALT and AST), which are commonly elevated in ICP, and bilirubin levels, which rise in roughly 10% of cases.
One frustrating aspect of diagnosis: bile acid results can take several days to come back from the lab, and levels may be normal early in the condition before rising later. If your first test comes back normal but the itching persists or worsens, repeat testing is reasonable.
Severity Categories
ICP is classified by bile acid levels into three tiers, and the category matters because it directly affects the risk to your baby and how your pregnancy will be managed:
- Mild ICP: bile acids between 19 and 39 micromol/L
- Moderate ICP: bile acids between 40 and 99 micromol/L
- Severe ICP: bile acids at 100 micromol/L or above
Risks to the Baby
The primary concern with ICP is its effect on the baby, particularly the risk of stillbirth. The good news is that for mild ICP, the risk of stillbirth is no different from someone without the condition. For moderate ICP, the risk remains similar to the general population until around 38 to 39 weeks of pregnancy, at which point it begins to rise. Severe ICP, with bile acids at 100 or above, carries a stillbirth risk of approximately 3%.
Higher bile acid levels (above 40 micromol/L) are also associated with a two-to-five-fold increase in the risk of preeclampsia. Babies born to mothers with severe ICP face higher rates of preterm birth and breathing difficulties at delivery. This is why bile acid levels are monitored regularly once the diagnosis is made, sometimes weekly, because levels can change throughout pregnancy.
Treatment and Symptom Relief
The main medication used for ICP is ursodeoxycholic acid, a pill that helps improve bile flow from the liver and can lower bile acid levels in the blood. Many people notice their itching improves within a week or two of starting treatment, though it doesn’t always resolve completely. The medication is considered safe during pregnancy and is the standard first-line approach.
Beyond medication, some practical measures can take the edge off the itching. Cool baths, cold compresses on the palms and feet, lightweight breathable fabrics, and fragrance-free moisturizers all help some people. Antihistamines may be suggested for nighttime itching, though they tend to work better for making you drowsy enough to sleep than for actually reducing the itch.
Delivery Timing
Because the risks to the baby increase as pregnancy progresses, especially at higher bile acid levels, early delivery is a central part of managing ICP. The Society for Maternal-Fetal Medicine recommends delivery between 36 and 39 weeks for people with bile acid levels under 100 micromol/L, with the exact timing depending on how high levels are and whether they’re trending upward. For severe ICP (bile acids at 100 or above), delivery at 36 weeks is recommended, since the risk of stillbirth climbs substantially around that point.
This often means an induction of labor rather than waiting for labor to start on its own. Your provider will weigh the risks of prematurity against the risks of continuing the pregnancy, and that conversation will be guided largely by your bile acid trends.
What Happens After Delivery
ICP resolves after the baby is born. Most people notice the itching fading within the first few days postpartum, and bile acid levels gradually return to normal. To confirm everything has cleared, your provider should recheck your bile acid levels and liver function tests three to six months after delivery. If bile acids remain elevated at six months, further evaluation is needed to rule out an underlying genetic condition or chronic liver disease unrelated to pregnancy.
If you’re planning future pregnancies, knowing your recurrence risk is useful. With nearly half of previously affected individuals developing ICP again, you can plan ahead by alerting your provider early in the next pregnancy so testing can begin promptly if itching returns.