title: Comparative study on the outcome of obstetric cholestasis.
abstract: OBJECTIVE
  The aim of this study was to determine the characteristics and outcomes of obstetric cholestasis (OC) and the significance of measuring total bile acid (TBA) to aid diagnosis.
  
  
  METHODS
  This study was conducted over a 27-month period at a tertiary referral maternity hospital (>8000 deliveries annually). In the study period, 753 women presented with pruritus of no specific origin. This group was divided into OC (TBA > or =6 micromol/L, N=151) and idiopathic pruritus of pregnancy (TBA <6 micromol/L, N=602). The latter group served as controls. Data were collected retrospectively and analyzed using SPSS 11.4 for Windows (SPSS Inc., Chicago, IL, USA).
  
  
  RESULTS
  Patients were matched for age, ethnicity, parity, and smoking status, sex of baby, and Apgar scores at 1 and 5 minutes. OC was noted to be higher in twin pregnancies. Twice as many mothers in the OC group were induced compared to controls. Of the OC group, 18.0% delivered preterm versus 7.7% of controls. Of the mothers with OC, 48.3% had a TBA in the range of 11-39.9 micromol/L, 21.2% had a TBA >40 micromol/L, and the remaining 30.5% had a TBA between 6 and 10.9 micromol/L. Of the OC group with preterm delivery, all had a raised TBA >11 micromol/L.
  
  
  CONCLUSIONS
  The presence of OC increases preterm delivery, both idiopathic and iatrogenic. Increasing induction, admission to the neonatal intensive care unit, and low birth weight were also noted. A TBA cut-off value of >11 micromol/L will more accurately aid the diagnosis of OC in the absence of raised liver function test results, reducing the over-diagnosis of this condition.
authors.affiliation: Department of Obstetrics and Gynaecology, Coombe Women's Hospital, Dolphin's Barn, Dublin 8, Republic of Ireland. wlfaud@yahoo.co.uk
authors.forename: L F A
authors.initials: LF
authors.lastname: Wong
authors.forename: H
authors.initials: H
authors.lastname: Shallow
authors.forename: M P
authors.initials: MP
authors.lastname: O'Connell
mesh_terms: D000328:Adult; D001647:Bile Acids and Salts / Q000097:blood*; D015415:Biomarkers / Q000097:blood; D002779:Cholestasis / Q000097:blood* / Q000150:complications; D005260:Female; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000097:blood* / Q000209:etiology
chemical_list: D001647:Bile Acids and Salts; D015415:Biomarkers