A 28-year-old primigravida from Delhi presents at 24 weeks gestation for routine antenatal care. She is asymptomatic with a BMI of 26 kg/m². Her fasting blood glucose is 95 mg/dL and 2-hour post-75 g oral glucose tolerance test (OGTT) value is 168 mg/dL. Her HbA1c is 5.8%. What is the most appropriate next step in management?

Question

Accepted Answer

B. Diagnose gestational diabetes and initiate medical nutrition therapy with glucose monitoring. ## Diagnosis of Gestational Diabetes

**Key Point:** This patient meets diagnostic criteria for gestational diabetes mellitus (GDM) based on the 75 g OGTT performed at 24 weeks.

### OGTT Diagnostic Criteria (WHO/IADPSG)
The 75 g OGTT is performed at 24–28 weeks gestation. A single abnormal value is diagnostic of GDM:

| Time Point | Diagnostic Threshold (mg/dL) |
|---|---|
| Fasting | ≥92 |
| 1 hour | ≥180 |
| 2 hour | ≥153 |

**Clinical Pearl:** In this patient, the 2-hour value of 168 mg/dL exceeds the threshold of 153 mg/dL, confirming GDM diagnosis. A single abnormal value is sufficient — no need to repeat.

### Immediate Management of Confirmed GDM

1. **Medical Nutrition Therapy (MNT)** — first-line intervention
   - Individualized dietary counseling by dietitian
   - Carbohydrate counting, portion control, emphasis on complex carbs
   - Modest caloric restriction if overweight (not weight loss)

2. **Self-Monitoring of Blood Glucose (SMBG)**
   - Fasting and postprandial (2 hours after meals) glucose targets:
     - Fasting: <95 mg/dL
     - Postprandial: <120 mg/dL (some guidelines: <140 mg/dL)
   - Frequency: 4 times daily (fasting + 3 postprandial)

3. **Pharmacotherapy** — indicated if MNT fails to achieve targets after 1–2 weeks
   - First-line: Insulin (safest in pregnancy)
   - Second-line: Metformin (if patient declines insulin and has no contraindications)

**High-Yield:** The diagnosis is already established; the next step is initiation of MNT and glucose monitoring, NOT further testing or reassurance.

### Why Other Options Are Incorrect

- **Repeat OGTT in 4 weeks:** Unnecessary; one abnormal value confirms diagnosis. Repeating delays treatment initiation.
- **Start metformin without MNT:** Metformin is second-line; MNT is mandatory first-line. Insulin is preferred in pregnancy.
- **Reassure patient:** Dangerous; untreated GDM increases risk of preeclampsia, fetal macrosomia, shoulder dystocia, and neonatal hypoglycemia.

**Mnemonic:** GDM Management = **MNT First, Then Insulin** (MFTI) — Medical Nutrition Therapy is always the foundation; pharmacotherapy added only if targets not met.

Answer

A. Reassure the patient as fasting glucose is normal and repeat testing at 28 weeks

Answer

C. Start metformin 500 mg twice daily and dietary counseling; repeat OGTT at 32 weeks

Answer

D. Repeat OGTT in 4 weeks and start insulin if abnormal

Explanation

Diagnosis of Gestational Diabetes

OGTT Diagnostic Criteria (WHO/IADPSG)

Immediate Management of Confirmed GDM

Why Other Options Are Incorrect

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