title: A 12-hour urine collection accurately assesses proteinuria in the hospitalized hypertensive gravida.
abstract: OBJECTIVE
  To determine whether a urine collection of < 24 hours duration accurately assesses the level of proteinuria in inpatients being evaluated for preeclampsia.
  
  
  METHODS
  Patients admitted to the University of Mississippi between January and June of 1998 for evaluation of preeclampsia underwent two consecutive 12-hour urine collections. Each collection was analyzed for total protein, total calcium, total volume, and urine creatinine. A concurrent serum creatinine value was obtained. The protein:creatinine ratio, calcium: creatinine ratio, and creatinine clearance were calculated. Pearson's correlation, sensitivity, specificity, and positive and negative predictive values were assessed.
  
  
  RESULTS
  A total of 25 patients (86%) were preeclamptic. Total protein, the protein: creatinine ratio, and serum creatinine were significantly correlated between the first and second urine collection. The sensitivity and specificity of the 12-hour urine collection was 96% and 100%, respectively.
  
  
  CONCLUSIONS
  A 12-hour urine collection accurately depicts the amount of proteinuria in hospitalized gravidas being evaluated for preeclampsia.
authors.affiliation: Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson 39216-4505, USA.
authors.forename: B K
authors.initials: BK
authors.lastname: Rinehart
authors.forename: D A
authors.initials: DA
authors.lastname: Terrone
authors.forename: J E
authors.initials: JE
authors.lastname: Larmon
authors.forename: K G
authors.initials: KG
authors.lastname: Perry
authors.forename: R W
authors.initials: RW
authors.lastname: Martin
authors.forename: J N
authors.initials: JN
authors.lastname: Martin
mesh_terms: D000328:Adult; D002118:Calcium / Q000652:urine; D003404:Creatinine / Q000097:blood / Q000652:urine; D005260:Female; D006801:Humans; D008499:Medical Records; D011225:Pre-Eclampsia / Q000652:urine*; D011237:Predictive Value of Tests; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000592:standards*; D011507:Proteinuria / Q000175:diagnosis* / Q000652:urine; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D013048:Specimen Handling / Q000592:standards*; D013997:Time Factors
chemical_list: D003404:Creatinine; D002118:Calcium