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Diabetes in pregnancy

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Diabetes in pregnancy is a broad topic spanning obstetrics, endocrinology, and maternal-fetal medicine. Rather than dump everything, here's the landscape and a short overview - then tell me which part you want in depth.

Topic Breakdown

  1. Classification - Pregestational (Type 1/Type 2) vs Gestational Diabetes Mellitus (GDM); White's classification
  2. Screening & Diagnosis - Universal screening timing, OGTT protocols (one-step vs two-step), diagnostic thresholds (IADPSG, ACOG, Carpenter-Coustan)
  3. Maternal Complications - Preeclampsia, polyhydramnios, diabetic ketoacidosis, worsening retinopathy/nephropathy, operative delivery risk
  4. Fetal/Neonatal Complications - Macrosomia, shoulder dystocia, congenital anomalies (esp. with pregestational DM), neonatal hypoglycemia, respiratory distress syndrome, stillbirth risk
  5. Pathophysiology - Placental hormones (hPL, cortisol, progesterone) causing insulin resistance; fetal hyperinsulinemia (Pedersen hypothesis)
  6. Management - Glycemic targets, diet/exercise, insulin regimens, oral agents (metformin/glyburide) use and controversies, monitoring
  7. Intrapartum & Delivery Planning - Timing of delivery, glucose control during labor, mode of delivery considerations
  8. Postpartum Care - Postpartum glucose testing, breastfeeding, future T2DM risk, contraception counseling

Brief Overview

Diabetes complicating pregnancy is divided into pregestational diabetes (diagnosed before pregnancy, Type 1 or Type 2) and gestational diabetes mellitus (GDM), which develops due to the insulin-resistant state induced by placental hormones (human placental lactogen, progesterone, cortisol) typically peaking in the second/third trimester. GDM is screened for in most guidelines between 24-28 weeks using an oral glucose tolerance test, though earlier screening is done in high-risk women.
Both forms carry a shared mechanism of maternal hyperglycemia crossing the placenta, driving fetal hyperinsulinemia (the Pedersen hypothesis), which underlies macrosomia, neonatal hypoglycemia, and increased stillbirth risk. Pregestational diabetes additionally carries a risk of congenital malformations (cardiac, neural tube) tied to hyperglycemia during organogenesis in the first trimester, which GDM does not, since it typically develops after that window.
Management centers on tight glycemic control via diet, exercise, and pharmacotherapy (insulin remains first-line for pregestational and refractory GDM; metformin and glyburide are used in some settings for GDM), close fetal surveillance, and individualized delivery timing to balance risks of macrosomia/stillbirth against prematurity.
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