title: Serum relaxin as a potential marker for preterm labour.
abstract: OBJECTIVE
  To determine whether high serum relaxin concentrations in the 30th week of pregnancy were associated with preterm labour.
  
  
  METHODS
  Case-control study.
  
  
  METHODS
  Two antenatal clinics of the Department of Obstetrics and Gynecology University Hospital of Aarhus.
  
  
  METHODS
  A cohort of 991 women (82% of 1203 eligible) in the 30th week of pregnancy attending one of the two antenatal clinics. The cases comprised 23 (2.4%) women without pre-eclampsia or small for gestational age babies, who were delivered spontaneously before 37 completed weeks gestation. The control group of 46 women was randomly selected from the rest of the cohort, all of them were delivered at term.
  
  
  METHODS
  Blood samples were collected at 30 weeks gestation and stored for analysis.
  
  
  METHODS
  Serum relaxin concentrations estimated by ELISA technique, length of gestation at delivery.
  
  
  RESULTS
  The mean serum relaxin concentrations in the 30th week of pregnancy was 455 (SD 169) pg/ml and 327 (SD 139) pg/ml in the cases and controls, respectively (P = 0.003, t test). In women with preterm delivery a negative correlation was found between relaxin concentration in the 30th week of pregnancy and the gestational age at parturition (r = -0.53, P = 0.02).
  
  
  CONCLUSIONS
  High relaxin concentrations may be associated with preterm delivery but the present results need confirmation in large scale studies.
authors.affiliation: Department of Obstetrics and Gynecology, Aarhus Kommunehospital, Denmark.
authors.forename: L K
authors.initials: LK
authors.lastname: Petersen
authors.forename: K
authors.initials: K
authors.lastname: Skajaa
authors.forename: N
authors.initials: N
authors.lastname: Uldbjerg
mesh_terms: D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005865:Gestational Age; D006801:Humans; D007752:Obstetric Labor, Premature / Q000097:blood*; D011247:Pregnancy; D012065:Relaxin / Q000097:blood*
chemical_list: D015415:Biomarkers; D012065:Relaxin