Patients in the early treatment group with a positive GTT continued treatment, and those with a negative GTT continued treatment, but reduced monitoring to twice daily – returning to four times daily testing if levels increased. Those in the routine care group initiated treatment if the GTT was positive, and continued usual care if it was negative.
The groups gained a similar amount of weight during the study and did not differ in terms of insulin use, but the early treatment group started insulin at an earlier gestational age, and nonsignificant trends were seen toward a decrease in the primary outcome and toward lower GTT values in that group. The early treatment group patients also had a lower cesarean delivery rate (29.4% vs. 47,2%; RR, 0.63), but the difference did not reach statistical significance, Dr. Osmundson said.
Similarly, nonsignificant trends were seen toward lower infant birth weight, less macrosomia, and lower umbilical cord C-peptide levels in the early treatment group.
Glycosylated HbA1C is widely used for monitoring glycemic control, but was only recently adopted as an additional method of screening for diabetes. The measure has several advantages over the oral GTT, as it can be performed in a nonfasting state, requires only one blood draw, and provides information about average glucose exposure over time, she said.
The American Diabetes Association accepted HbA1C as an additional method for diagnosing type 2 diabetes in 2009, and classified those with levels between 5.7% and 6.4% as having prediabetes. That same year, an International Association of Diabetes in Pregnancy study group recommended that HbA1C of 6.5% or greater in pregnancy be considered overt diabetes, but made no recommendations regarding the management of those with prediabetic HbA1C, Dr. Osmundson said.
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