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Health Promotion & Maintenance24-28 wks: 1-hr 50g OGTT

Gestational Diabetes ScreeningNCLEX cheat sheet

Gestational diabetes mellitus (GDM) is glucose intolerance first recognized during pregnancy, driven by placental hormones that cause insulin resistance.

22 key facts 5 practice questions Reviewed Oct 2026
The 1-minute sheetCinnaRN

Screen

  • 1-hr 50g glucola @ 24-28 wks
  • ≥140 mg/dL → do 3-hr test
  • 3-hr 100g = confirms diagnosis

Risk

  • Macrosomia → shoulder dystocia
  • Neonatal hypoglycemia after birth

Do

  • Diet + exercise first-line
  • Insulin if uncontrolled (no oral)
Red flag to remember

Persistent maternal hyperglycemia or signs of preeclampsia (severe headache, visual changes, elevated BP) — report.

Before you read

Test yourself first: 5 questions

Question 1 of 5

A client who had gestational diabetes is preparing for discharge after delivery. Which teaching point about her long-term health is most accurate?

What is gestational diabetes screening?

Routine screening occurs at 24-28 weeks, with earlier screening for high-risk women. Identifying and controlling GDM reduces complications like macrosomia and neonatal hypoglycemia.

Key points to remember

  • Universal screening is performed at 24-28 weeks gestation; high-risk women (obesity, prior GDM, family history) are screened earlier.
  • The common two-step approach uses a 1-hour 50 g glucose challenge test (non-fasting); a value ≥130-140 mg/dL leads to a confirmatory test.
  • The diagnostic test is a 3-hour 100 g oral glucose tolerance test (fasting); two or more elevated values confirm GDM.
  • A one-step 2-hour 75 g OGTT is an alternative, where a single elevated value diagnoses GDM.
  • GDM raises risk of macrosomia, shoulder dystocia, neonatal hypoglycemia, preeclampsia, and cesarean birth.
  • First-line management is diet and exercise; insulin is the preferred medication if glucose targets are not met.

Nursing priorities

  1. Ensure the patient is fasting (8 hours) before the 3-hour OGTT and remains seated/restful during testing.
  2. Teach blood glucose self-monitoring and recommended targets (fasting <95 mg/dL, 1-hour post-meal <140 mg/dL, 2-hour <120 mg/dL).
  3. Reinforce a consistent carbohydrate-controlled diet and regular moderate exercise.
  4. Administer or teach insulin when prescribed, as it does not cross the placenta.
  5. Monitor fetal growth and well-being and assess the newborn for hypoglycemia after birth.

Labs & values

1-hour 50 g challenge: abnormal ≥130-140 mg/dL (threshold varies)1-hour 50 g challenge: abnormal ≥130-140 mg/dL (threshold varies)
3-hour 100 g OGTT (fasting <95, 1-hr <180, 2-hr <155, 3-hr <140 mg/dL)3-hour 100 g OGTT (fasting <95, 1-hr <180, 2-hr <155, 3-hr <140 mg/dL)
1-step 75 g OGTT (fasting <92, 1-hr <180, 2-hr <153 mg/dL)1-step 75 g OGTT (fasting <92, 1-hr <180, 2-hr <153 mg/dL)
Fasting <95 mg/dL target during pregnancy
130140mg/dL Normal

Patient teaching

  • Most GDM resolves after delivery, but it raises lifelong risk of type 2 diabetes, so get rescreened postpartum (6-12 weeks) and periodically.
  • Follow the carbohydrate-controlled meal plan, eat regular meals/snacks, and stay active as advised.
  • Insulin is safe in pregnancy because it does not cross the placenta; report repeated low or high readings.
  • Breastfeeding helps glucose control and lowers future diabetes risk for mother and baby.

Red flags: report now

  • Persistent maternal hyperglycemia or signs of preeclampsia (severe headache, visual changes, elevated BP) — report.
  • Neonatal hypoglycemia after birth (jitteriness, poor feeding, lethargy) in the infant of a diabetic mother — treat promptly.
  • Symptoms of hypoglycemia in a patient on insulin: shakiness, sweating, confusion — treat immediately.

References

Clinical references for this topic

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