Intrahepatic Cholestasis of Pregnancy Diagnosis and Management

Diagnostic Approach

ICP is diagnosed when serum bile acid levels exceed 10 μmol/L in the setting of pruritus, typically during the second or third trimester, according to the American Gastroenterological Association 1, 2, 3, 4
Most ICP cases present in the third trimester with mild to moderately elevated AST/ALT and total bilirubin <6 mg/dL, as reported by the American Gastroenterological Association 2, 3
If initial bile acid levels are normal but clinical suspicion remains high, repeat testing after excluding other causes including biliary obstruction, viral hepatitis, and chronic liver disease, as recommended by the American Gastroenterological Association 2, 3

Initiate ursodeoxycholic acid (UDCA) 10-15 mg/kg/day in divided doses for all confirmed ICP cases, as recommended by the American Gastroenterological Association 1, 2, 3, 4
UDCA improves pruritus, serum bile acid levels, and liver transaminases, and meta-analyses demonstrate decreased adverse outcomes including preterm birth and stillbirth, according to the American Gastroenterological Association 2, 3
If UDCA alone is insufficient, add cholestyramine as second-line therapy, as suggested by the American Gastroenterological Association 2, 3
Rifampicin can be attempted as third-line treatment for refractory pruritus, as reported by the European Association for the Study of the Liver 2, 5

Deliver at 36 0/7 weeks or at diagnosis if after 36 weeks due to substantially increased stillbirth risk, as recommended by the European Association for the Study of the Liver (GRADE 1B recommendation) 2, 3, 4
Deliver between 36 0/7 and 39 0/7 weeks of gestation for moderate-risk patients (bile acids <100 μmol/L), as suggested by the American Gastroenterological Association (GRADE 1C recommendation) 2, 3, 4

If pruritus persists beyond 6 weeks postpartum, pursue further evaluation for underlying chronic liver disease, as recommended by the American Gastroenterological Association 1, 3
Pruritus typically resolves after delivery, according to the American Gastroenterological Association 2, 3

For pregnant women with itching, immediately evaluate for intrahepatic cholestasis of pregnancy (ICP) by measuring serum bile acids and liver transaminases, as this condition carries significant risk of stillbirth and requires specific management with ursodeoxycholic acid and timed delivery, according to the American College of Obstetricians and Gynecologists 6
Pruritus affects approximately 23% of all pregnancies, with most cases having no underlying pathologic process, as reported by the American College of Obstetricians and Gynecologists 7

Ursodeoxycholic acid (UDCA) is the first-line agent for maternal symptom relief in ICP, with a GRADE 1A recommendation from the American College of Obstetricians and Gynecologists 6
For bile acids ≥100 μmol/L, deliver at 36 0/7 weeks due to substantially increased stillbirth risk, with a GRADE 1B recommendation from the American College of Obstetricians and Gynecologists 6
For bile acids <100 μmol/L, deliver between 36 0/7 and 39 0/7 weeks, with a GRADE 1C recommendation from the American College of Obstetricians and Gynecologists 6
Administer antenatal corticosteroids if delivering before 37 0/7 weeks, with a GRADE 1A recommendation from the American College of Obstetricians and Gynecologists 6

Never delay delivery in confirmed ICP with bile acids ≥100 μmol/L beyond 36 weeks, as stillbirth risk increases substantially, according to the American College of Obstetricians and Gynecologists 6
Do not perform preterm delivery based on clinical suspicion alone without laboratory confirmation of elevated bile acids, as recommended by the American College of Obstetricians and Gynecologists 6
Do not miss vitamin K deficiency in patients on cholestyramine, and monitor PT regularly, as advised by the American Association for the Study of Liver Diseases 8

The American College of Obstetricians and Gynecologists recommends that a pregnant woman should worry about itchiness when it develops in the second half of pregnancy, particularly if it affects the palms and soles, worsens at night, and occurs without a visible rash, as these features suggest intrahepatic cholestasis of pregnancy (ICP), which carries significant risk of stillbirth and requires immediate laboratory evaluation 9
New-onset pruritus without a rash developing in the second or third trimester should prompt immediate testing for ICP, as recommended by the American College of Obstetricians and Gynecologists 9
Itching predominantly affecting palms and soles that is worse at night is the classic presentation of ICP, according to the American College of Obstetricians and Gynecologists 9
Generalized itching that is severe enough to disrupt sleep or cause excoriations from scratching is a concern for ICP 9

The American College of Obstetricians and Gynecologists recommends immediately ordering serum bile acid levels (most sensitive test; diagnostic when >10 μmol/L) when ICP is suspected based on clinical features 9
Liver transaminases (ALT and AST are elevated in most but not all cases) should be ordered, as recommended by the American Association for the Study of Liver Diseases 10
Bilirubin and gamma-glutamyl transferase (GGT) should also be ordered, according to the American Association for the Study of Liver Diseases 10

The American College of Obstetricians and Gynecologists states that bile acids >10 μmol/L but <40 μmol/L are diagnostic of ICP; requires treatment and monitoring 9
Bile acids <100 μmol/L but >40 μmol/L are associated with significantly increased fetal complication rates; delivery between 36 0/7 and 39 0/7 weeks, as recommended by the American Association for the Study of Liver Diseases 10

Atopic dermatitis or eczema (usually with visible rash and history of atopy) should be excluded, as recommended by the American College of Obstetricians and Gynecologists 9
Pemphigoid gestationis (rare, presents with vesicles and bullae) should be excluded, according to the American College of Obstetricians and Gynecologists 9
Pre-eclampsia and acute fatty liver of pregnancy (have other systemic features) should be excluded, as recommended by the American Association for the Study of Liver Diseases 10
Medication-related pruritus (particularly narcotics) should be excluded, according to the American College of Obstetricians and Gynecologists 9

The American College of Obstetricians and Gynecologists recommends ordering bile acids and liver function tests at first presentation of concerning pruritus 9
Do not delay testing even if symptoms seem mild—stillbirth can occur suddenly without warning signs, as warned by the American College of Obstetricians and Gynecologists 11
Initiate ursodeoxycholic acid (UDCA) 10-15 mg/kg/day once diagnosis is confirmed (can be started empirically while awaiting results if clinical suspicion is high), as recommended by the American College of Obstetricians and Gynecologists 11