Medically reviewed content. Last updated: April 2026.
Medically reviewed content. Last updated: April 2026.
Obstetric cholestasis, also known as intrahepatic cholestasis of pregnancy (ICP), is a liver condition that causes intense itching, usually in the third trimester. It needs medical attention because raised bile acid levels can affect your baby. With proper diagnosis and management, the vast majority of ICP pregnancies have good outcomes.
ICP occurs when the normal flow of bile from the liver is impaired during pregnancy, causing bile acids to build up in the bloodstream. Bile is a digestive fluid produced by the liver and stored in the gallbladder. When it cannot flow normally, bile acids accumulate and cause intense itching.
ICP affects approximately 1 in 140 pregnancies in the UK, with higher rates in South Asian and South American populations. It typically develops in the third trimester, most commonly after 28 weeks, though it can occasionally appear earlier.
The exact cause is not fully understood, but it involves a combination of genetic susceptibility (ICP runs in families, and having a first-degree relative with the condition increases your risk), the effect of pregnancy hormones on liver function (rising oestrogen and progesterone levels in the third trimester appear to trigger bile flow impairment in susceptible people), and possibly environmental factors.
You are at higher risk if you have had ICP in a previous pregnancy (recurrence rate 45 to 90%), have a family history of ICP, are carrying twins or multiples, conceived through IVF, or have a history of liver disease or gallstones.
The hallmark symptom is intense itching without a visible rash. Key features include itching that is worst on the palms of the hands and soles of the feet, itching that is worse at night and can be severe enough to disrupt sleep, itching that does not respond to moisturisers or antihistamines, and no rash to explain the itching (scratch marks from itching may be present, but the itch comes first).
Other possible symptoms include dark urine (tea-coloured), pale or clay-coloured stools, mild jaundice (yellowing of the skin or whites of the eyes, though this is uncommon), fatigue, nausea, and loss of appetite.
Diagnosis requires blood tests. Your midwife or GP will request liver function tests (LFTs), which may show elevated ALT and AST (liver enzymes), and serum bile acid levels, which are the definitive test. A level above 10 micromol/L is considered abnormal.
Important points about testing: bile acid results can take several days to a week to return, results may be normal initially even if ICP is developing, and if your itching persists or worsens, request repeat testing even if the first result was normal. RCOG recommends repeating bile acid tests weekly if symptoms continue and initial results are normal.
A confirmed diagnosis requires raised bile acids and/or abnormal liver function in the context of pregnancy-specific itching, with other causes of liver disease excluded.
ICP is important because raised bile acid levels can affect your baby. The risks are related to the level of bile acids in your blood.
Bile acids 10 to 39 micromol/L (mild to moderate ICP): Slightly increased risk of preterm birth (spontaneous or planned). With appropriate monitoring and planned delivery by 40 weeks, outcomes are generally excellent.
Bile acids 40 to 99 micromol/L (severe ICP): Increased risk of complications, and delivery from 37 weeks is usually recommended.
Bile acids 100 micromol/L or above (very severe ICP): Highest risk. Earlier delivery and closer monitoring are recommended, with some units advising inpatient care.
The most serious concern is the risk of stillbirth, which is associated with very high bile acid levels. The absolute risk remains low with appropriate management, but this is why monitoring and planned delivery are so important.
UDCA is the most widely prescribed medication for ICP. It works by reducing bile acid levels in the blood and may relieve itching. It is considered safe in pregnancy. The evidence on whether UDCA reduces the risk of complications is mixed (the large PITCHES trial published in The Lancet in 2019 did not find a significant reduction in adverse outcomes), but it remains standard treatment in UK practice because it often improves symptoms and bile acid levels.
Aqueous cream with 1% menthol, applied to itchy areas, provides cooling relief. Antihistamines such as chlorphenamine may help with sleep, though they do not treat the underlying itch. Cool baths and loose cotton clothing can reduce irritation. Avoid perfumed soaps and products near itchy areas.
Once diagnosed, you will have weekly blood tests to monitor bile acid levels and liver function. Your care team will use these results to guide decisions about delivery timing. Your baby's movements are also important to monitor, and you should report any changes to your maternity unit immediately.
RCOG recommends discussing delivery timing based on bile acid levels. For bile acids below 40 micromol/L, delivery is generally offered by 40 weeks. For 40 to 99 micromol/L, delivery from 37 weeks is usually recommended. For 100 micromol/L and above, earlier delivery may be considered, and some units recommend inpatient monitoring.
Induction of labour is the usual approach unless there is a reason for caesarean. The benefits of planned delivery must be balanced against the risks of prematurity, which is why bile acid levels guide the timing.
ICP resolves after delivery. Your bile acid levels and liver function should return to normal within a few weeks. The itching typically stops within the first few days. Your GP should arrange a follow-up liver function test at 6 to 12 weeks postpartum to confirm everything has normalised.
ICP does not cause long-term liver damage. However, if you had ICP, there is a 45 to 90% chance of it recurring in future pregnancies. Let your midwife know about your history early in any subsequent pregnancy so monitoring can begin promptly.
ICP occurs when the normal flow of bile from the liver is impaired during pregnancy, causing bile acids to build up in the bloodstream. Bile is a digestive fluid produced by the liver and stored in the gallbladder. When it cannot flow normally, bile acids accumulate and cause intense itching.
The exact cause is not fully understood, but it involves a combination of genetic susceptibility (ICP runs in families, and having a first-degree relative with the condition increases your risk), the effect of pregnancy hormones on liver function (rising oestrogen and progesterone levels in the third trimester appear to trigger bile flow impairment in susceptible people), and possibly environmental factors.
The hallmark symptom is intense itching without a visible rash. Key features include itching that is worst on the palms of the hands and soles of the feet, itching that is worse at night and can be severe enough to disrupt sleep, itching that does not respond to moisturisers or antihistamines, and no rash to explain the itching (scratch marks from itching may be present, but the itch comes first).
Diagnosis requires blood tests. Your midwife or GP will request liver function tests (LFTs), which may show elevated ALT and AST (liver enzymes), and serum bile acid levels, which are the definitive test. A level above 10 micromol/L is considered abnormal.
ICP is important because raised bile acid levels can affect your baby. The risks are related to the level of bile acids in your blood.
### Ursodeoxycholic acid (UDCA)
ICP resolves after delivery. Your bile acid levels and liver function should return to normal within a few weeks. The itching typically stops within the first few days. Your GP should arrange a follow-up liver function test at 6 to 12 weeks postpartum to confirm everything has normalised.
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