👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Health Promotion & Maintenance🔖 Free to read, print, and share
Also known as: GDM screening · glucose challenge test in pregnancy · OGTT in pregnancy
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Use this quick-reference guide to spot, treat, and prevent Gestational Diabetes Screening on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 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)
📚 Gestational Diabetes Screening — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Gestational diabetes mellitus (GDM) is glucose intolerance first recognized during pregnancy, driven by placental hormones that cause insulin resistance. 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.
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Key points
Understand these first
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.
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Nursing priorities
What to do, in order
Ensure the patient is fasting (8 hours) before the 3-hour OGTT and remains seated/restful during testing.
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.
❓ Gestational Diabetes Screening: NCLEX FAQs
What are the priority nursing interventions for Gestational Diabetes Screening?
Ensure the patient is fasting (8 hours) before the 3-hour OGTT and remains seated/restful during testing. Teach blood glucose self-monitoring and recommended targets (fasting <95 mg/dL, 1-hour post-meal <140 mg/dL, 2-hour <120 mg/dL). Reinforce a consistent carbohydrate-controlled diet and regular moderate exercise. Administer or teach insulin when prescribed, as it does not cross the placenta.
What are the warning signs of Gestational Diabetes Screening a nurse must report?
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.
What do I need to know about Gestational Diabetes Screening for the NCLEX?
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.
What patient teaching is important for Gestational Diabetes Screening?
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.
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Quick Tip
Universal screening is performed at 24-28 weeks gestation; high-risk women (obesity, prior GDM, family history) are screened earlier.