The prevalence of adverse pregnancy outcomes associated with poor
glycemic control are increasing. Accordingly, effective
blood glucose monitoring during pregnancy has become a subject of intense interest. Continuous
glucose monitoring (CGM) displays dynamic changes in
blood glucose by using probes to measure
glucose concentration in the interstitial fluid, and the rapid development of CGM has enabled the investigation of time in range (TIR) in the
glucose target range as a new parameter to evaluate
blood glucose. International guidelines have identified TIR as an important
blood glucose assessment method for pregnant patients with
type 1 diabetes mellitus that overcomes the limitations of conventional gestational
blood glucose monitoring, better reflects fluctuation in
blood glucose during pregnancy, and effectively improves maternal and neonatal outcomes. However, there is little clinical evidence for the use of TIR in pregnant women with
gestational diabetes mellitus and those with pre-pregnant
type 2 diabetes mellitus. TIR is expected to become a critical
indicator of
blood glucose control and management in hyperglycemic pregnant patients. We review the research progress of TIR to help clinicians understand the field of
blood glucose monitoring in pregnant women with
hyperglycemia.