title: Placental protein 13 as an early marker for pre-eclampsia: a prospective longitudinal study.
abstract: OBJECTIVE
  To assess the value of placental protein 13 (PP13) as an early marker of pre-eclampsia.
  
  
  METHODS
  Sequential blood samples were obtained from women with singleton viable pregnancies at 6-10, 16-20 and 24-28 weeks of gestation. Samples were tested for PP13 using a solid-phase sandwich enzyme-linked immunosorbent assay. Levels were expressed as multiples of the medians (MoM) of the unaffected population. The slope or rate of change in PP13 concentration per week of gestation was also calculated.
  
  
  METHODS
  Thirty-five prenatal care community clinics.
  
  
  METHODS
  In total, 1,366 women were recruited, and subsequently, 20 were diagnosed with pre-eclampsia, 41 with gestational hypertension and 1,178 were unaffected.
  
  
  METHODS
  Sensitivity and specificity of screening with PP13 at each gestational period and of PP13 level combined with the slope of PP13 between two testing periods.
  
  
  RESULTS
  At 6-10 gestational weeks, PP13 levels were significantly lower among the pre-eclampsia group with a median 0.28 MoM (95% CI 0.15-0.39, P < 0.004). Using a cutoff of 0.40 MoM, the sensitivity was 80%, false-positive rate (FPR) was 20% and odds ratio was 16.0 (95% CI 5.3-48.4). Combining MoM of 6-10 weeks and slope between 6-10 and 16-20 weeks, the sensitivity was 78%, the FPR was 6% and odds ratio was 55.5 (95% CI 18.2-169.2). The gestational hypertension group was not different from the normal group.
  
  
  CONCLUSIONS
  PP13 in the first trimester alone or in combination with the slope between the first and the second trimesters may be a promising marker for assessing the risk of pre-eclampsia.
authors.affiliation: Department of Obstetrics and Gynecology, Bnai Zion Medical Center, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel. rongon@bezeqint.net
authors.forename: R
authors.initials: R
authors.lastname: Gonen
authors.forename: R
authors.initials: R
authors.lastname: Shahar
authors.forename: Y I
authors.initials: YI
authors.lastname: Grimpel
authors.forename: I
authors.initials: I
authors.lastname: Chefetz
authors.forename: M
authors.initials: M
authors.lastname: Sammar
authors.forename: H
authors.initials: H
authors.lastname: Meiri
authors.forename: Y
authors.initials: Y
authors.lastname: Gibor
mesh_terms: D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000097:blood; D042241:Early Diagnosis; D005260:Female; D037161:Galectins / Q000097:blood*; D006801:Humans; D008875:Middle Aged; D011225:Pre-Eclampsia / Q000175:diagnosis*; D011247:Pregnancy; D011257:Pregnancy Proteins / Q000097:blood*; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis; D011446:Prospective Studies; D012307:Risk Factors; D012680:Sensitivity and Specificity; D055815:Young Adult
chemical_list: D015415:Biomarkers; D037161:Galectins; C038195:LGALS13 protein, human; D011257:Pregnancy Proteins