title: Failure of serum beta2-microglobulin levels as an early marker of preeclampsia.
abstract: OBJECTIVE
  Our purpose was to determine whether second-trimester maternal serum beta(2)-microglobulin levels could be used to predict subsequent development of preeclampsia.
  
  
  METHODS
  We first did a cross-sectional study to compare serum concentrations of beta(2)-microglobulin between women with preeclampsia and normotensive women. Serum beta(2)-microglobulin concentrations of 11 consecutive patients hospitalized for preeclampsia were compared with those of 11 normotensive women hospitalized for threatened premature labor. The second part of the study consisted of a nested case-control study in which each woman in whom preeclampsia ultimately developed was matched with 2 women who remained normotensive throughout gestation. For that purpose a total of 450 consecutive healthy nulliparous women were studied prospectively. Blood samples were collected between 20 and 24.9 weeks' gestation and frozen at -20 degrees C until assay after groups had been selected.
  
  
  RESULTS
  In the cross-sectional study serum beta(2)-microglobulin levels were significantly higher in women with preeclampsia than in control women (1.87 +/- 0.36 mg/L vs 1.01 +/- 0. 12 mg/L; t = 7.61; P <.0001). Among the 450 women who were followed up prospectively, preeclampsia developed in 7 (1.5 %). Fourteen of the women who remained normotensive were matched with the 7 women in whom preeclampsia ultimately developed. No difference was found in early serum beta(2)-microglobulin concentrations between women in whom preeclampsia subsequently developed and those who remained normotensive throughout gestation (1.02 +/- 0.12 vs 0.95 +/- 0.12 mg/L).
  
  
  CONCLUSIONS
  Serum beta(2)-microglobulin levels do not predict subsequent preeclampsia.
authors.affiliation: Division of Maternal-Fetal Medicine, University of Tennessee, Memphis, TN 38103, USA.
authors.forename: B
authors.initials: B
authors.lastname: Haddad
authors.forename: D
authors.initials: D
authors.lastname: Desvaux
authors.forename: J C
authors.initials: JC
authors.lastname: Livingston
authors.forename: E
authors.initials: E
authors.lastname: Barranger
authors.forename: B J
authors.initials: BJ
authors.lastname: Paniel
authors.forename: B M
authors.initials: BM
authors.lastname: Sibai
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D003404:Creatinine / Q000097:blood; D005260:Female; D006801:Humans; D011225:Pre-Eclampsia / Q000097:blood / Q000175:diagnosis*; D011237:Predictive Value of Tests; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011446:Prospective Studies; D014527:Uric Acid / Q000097:blood; D001613:beta 2-Microglobulin / Q000097:blood*
chemical_list: D015415:Biomarkers; D001613:beta 2-Microglobulin; D014527:Uric Acid; D003404:Creatinine