title: One hour versus two hours postprandial glucose measurement in gestational diabetes: a prospective study.
abstract: OBJECTIVE
  To compare the rate of adverse perinatal outcomes among women with gestational diabetes mellitus (GDM), monitored by 1 versus 2 hour-postprandial glucose (PPG) measurements.
  
  
  METHODS
  A total of 112 women diagnosed with GDM, by the criteria of Carpenter-Coustan, were included in the study population. Women were recruited from two different treatment settings, but were managed by the same team of health-care professionals using a standardized protocol. Allocation to treatment group was based on treatment setting. Glucose levels were measured fasting, and either 1 hour (1-hour monitoring group-target values <140 mg/dl) or 2 hours (2-hour monitoring group-target values <120 mg/dl) postprandially. Demographic data and perinatal outcomes were collected from their medical records.
  
  
  RESULTS
  In all, 66 women were assigned to 1-hour monitoring group (1 h-PPG) and 46 women to 2-hour monitoring group (2 h-PPG). There were no differences in parity, family history of diabetes, rate of GDM in previous pregnancies, weight gain, pregestational BMI and 50-g-glucose challenge test (GCT) and 100-g oral glucose challenge test (OGTT) results. As expected, there was a significant difference in mean blood glucose levels between the two groups (108.1+/-19.2 and 94.9+/-21.2 mg/dl, 1- and 2 hours, respectively, p<0.0001); however, HbA1C levels were similar in the two groups. Perinatal outcomes were defined as gestational week at delivery; fetal weight (3325+/-471 vs 3309+/-608 g, respectively) and percentile (47.2+/-27 vs 49.6+/-30, respectively), and were similar for both groups. Insulin therapy was initiated more frequently in 2-hour monitoring group (28 and 40% of women in groups 1 and 2, respectively; p<0.05). Rates of macrosomia (7.5 versus 10.6%), large for gestational age (7.4 versus 15.2%), and delivery by cesarean section (24 versus 30%) were increased in group 2 (2 h-PPG) but these differences did not reach statistical significance.
  
  
  CONCLUSIONS
  These data suggest that diet control in women with GDM managed by 1-hour PPG measurements is associated with a decreased rate of insulin therapy. However, neonatal and obstetrical outcomes are not determined by the timing of their glucose determinations.
authors.affiliation: Department of Obstetrics and Gynecology, Sheba Medical Center, Tel-Hashomer, Israel.
authors.forename: Boaz
authors.initials: B
authors.lastname: Weisz
authors.forename: Alon
authors.initials: A
authors.lastname: Shrim
authors.forename: Carol J
authors.initials: CJ
authors.lastname: Homko
authors.forename: Eyal
authors.initials: E
authors.lastname: Schiff
authors.forename: Gil S
authors.initials: GS
authors.lastname: Epstein
authors.forename: Eyal
authors.initials: E
authors.lastname: Sivan
mesh_terms: D000328:Adult; D001724:Birth Weight; D001786:Blood Glucose / Q000032:analysis*; D002585:Cesarean Section; D016640:Diabetes, Gestational / Q000097:blood*; D005260:Female; D005865:Gestational Age; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage; D007328:Insulin / Q000008:administration & dosage; D011247:Pregnancy; D011256:Pregnancy Outcome; D011446:Prospective Studies
chemical_list: D001786:Blood Glucose; D007004:Hypoglycemic Agents; D007328:Insulin