Intrahepatic Cholestasis of Pregnancy (ICP) — Evidence Library

What it is

Intrahepatic cholestasis of pregnancy (ICP), sometimes called obstetric cholestasis, is a temporary liver condition unique to pregnancy. Pregnancy hormones slow the flow of bile from the liver, and bile acids spill into the bloodstream. The classic symptom is relentless itching — often worst at night and on the palms and soles — usually without a rash. Diagnosis is confirmed by a fasting serum bile acid level (and sometimes liver function tests). ICP is important because higher bile acid levels are associated with an increased risk of stillbirth, and delivery timing is the main tool clinicians have to reduce that risk. Symptoms and lab values typically resolve within days to weeks after birth, but ICP can recur in future pregnancies and is associated with a higher long-term risk of liver and gallbladder disease.

Evidence review links

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Possible benefits

Diagnosis is straightforward once suspected — a bile acid blood test confirms itReview sources ↓
Ursodeoxycholic acid (UDCA / ursodiol) often reduces itching and modestly lowers bile acidsReview sources ↓
Planned delivery timing based on peak bile acid levels reduces the risk of late-pregnancy stillbirthReview sources ↓
Symptoms usually resolve within 2–4 weeks postpartumReview sources ↓

Possible risks

Increased risk of stillbirth, especially when peak bile acids are ≥100 µmol/L (SMFM 2021; Ovadia et al. 2019, Lancet)Review sources ↓
Higher rates of preterm birth (spontaneous and iatrogenic), meconium-stained fluid, and NICU admissionReview sources ↓
Severe, sleep-disrupting itching that can affect mental healthReview sources ↓
Recurrence in ~60–70% of future pregnancies; long-term association with hepatobiliary diseaseReview sources ↓
UDCA reduces itching but has not been shown in the PITCHES trial (2019) to reduce stillbirth on its own — delivery timing remains the primary risk-reduction toolReview sources ↓

Alternatives

Watchful waiting is not appropriate once ICP is diagnosed — active monitoring and a delivery plan are standardReview sources ↓
For itching relief: cool baths, cotton clothing, aqueous cream with menthol, antihistamines at night (comfort only, not disease-modifying)Review sources ↓
Rifampicin as an add-on to UDCA in severe/refractory cases (specialist decision)Review sources ↓
Individualized delivery timing (typically 36–37 weeks for severe ICP with bile acids ≥100, 37–38 weeks for moderate, 38–39 weeks for mild) — per SMFM and RCOG guidanceReview sources ↓

Current evidence

The largest evidence base is Ovadia et al. (Lancet 2019), an individual-patient-data meta-analysis of ~5,500 ICP pregnancies showing stillbirth risk rises sharply once total bile acids reach ≥100 µmol/L. The PITCHES RCT (Chappell et al., Lancet 2019) found that UDCA improved itching but did not significantly reduce a composite adverse perinatal outcome, which reframed UDCA as symptom-directed rather than life-saving. SMFM Consult Series #53 (2021) and RCOG Green-top Guideline No. 43 (2022) both recommend bile-acid-guided delivery timing, active fetal surveillance, and UDCA for symptom control. ICP Care and Evidence Based Birth have plain-language summaries that mirror this guidance. Guideline differences: some centers offer delivery earlier for bile acids ≥40, while others reserve early delivery for ≥100 — ask your team where they draw the line and why.

Where the evidence is clear · where people may choose differently

For most topics, guidelines from ACOG, WHO, and other major bodies broadly agree on the core safety points (when to act in an emergency, informed-consent standards, monitoring baselines). Where reasonable people — and even guidelines — differ tends to be around thresholds (when to start or stop something), preferences (comfort, environment, support), and values (how you weigh small risks against benefits). Use the questions below to explore those pieces with your care team.

Educational only. Your care team can help you weigh what applies to your specific situation.