title: HbA1c levels in patients with gestational diabetes mellitus: Relationship with pre-pregnancy BMI and pregnancy outcome.
abstract: OBJECTIVE
  The use of glycated hemoglobin (HbA1c) measurement in gestational diabetes mellitus (GDM) is controversial. Aim of the present study was to determine HbA1c levels in a series of GDM patients, in order to verify the possible contribution of HbA1c to GDM management.
  
  
  METHODS
  The study included 148 caucasian GDM patients. GDM screening was performed between the 24th and the 28th week of gestation by a two-step procedure, according to the 4th and 5th International Workshop Conference on Gestational Diabetes Mellitus recommendations. Exclusion criteria were: preexisting diabetes, corticosteroid therapy, history of asthma or hypertension, known fetal anomaly, history of previous stillbirth, preterm delivery considered to be likely for either maternal disease or fetal conditions. HBA1c was determined by a standard HPLC technique.
  
  
  RESULTS
  At GDM diagnosis, all HbA1c levels were ≤ 6% and the greatest frequency (71/148; 48.0%) of HbA1c values resulted in the range 5.0-5.3%. This frequency increased to 54% before delivery. A significant correlation between HbA1c values at GDM diagnosis and individual BMI prior to conception was observed. The proportion of pregnancies presenting negative outcomes increased progressively with increasing HbA1c levels, from 6.2% (1/16) for HbA1c levels <5% to 18.3% (13/71) for HbA1c 5.0-5.3%, to 37.8% (17/45) in patients with HBA1c levels 5.4-5.6%, to 56.2% (9/16) for HbA1c levels >5.6%. ROC analysis showed that HbA1c at diagnosis and before delivery resulted a good predictor of adverse pregnancy outcome.
  
  
  CONCLUSIONS
  The present results indicate that HbA1c levels could be of help in predicting adverse pregnancy events.
authors.affiliation: Struttura Operativa Complessa Endocrinologia-Diabetologia, Azienda Ospedaliera "Pugliese-Ciaccio", Catanzaro, Italy. carmelo.capula@yahoo.it.
authors.forename: C
authors.initials: C
authors.lastname: Capula
authors.forename: T
authors.initials: T
authors.lastname: Mazza
authors.forename: R
authors.initials: R
authors.lastname: Vero
authors.forename: G
authors.initials: G
authors.lastname: Costante
mesh_terms: D000328:Adult; D001786:Blood Glucose / Q000378:metabolism; D015992:Body Mass Index; D016640:Diabetes, Gestational / Q000097:blood / Q000503:physiopathology*; D005260:Female; D006442:Glycated Hemoglobin / Q000378:metabolism*; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011256:Pregnancy Outcome; D012306:Risk
chemical_list: D001786:Blood Glucose; D006442:Glycated Hemoglobin