According to current diagnostic criteria, what is the minimum proteinuria threshold required to diagnose preeclampsia with severe features in a non-diabetic pregnant woman?

Explanation

## Diagnostic Criteria for Preeclampsia with Severe Features **Key Point:** According to the 2013 ACOG guidelines (and reaffirmed in subsequent updates), the **minimum proteinuria threshold to diagnose preeclampsia** is ≥0.3 grams in 24-hour urine or a protein-to-creatinine ratio ≥0.3 mg/mg. Importantly, the 2013 ACOG criteria **eliminated the ≥5.0 g/24 h proteinuria threshold** as a criterion for "severe features," and **no specific higher proteinuria threshold** (e.g., ≥1.0 g or ≥2.0 g) is required to define severe preeclampsia by proteinuria alone. ## Evolution of Diagnostic Criteria | Criterion | Pre-2013 | Current (2013 ACOG) | |-----------|----------|--------------------| | **Minimum proteinuria for preeclampsia diagnosis** | ≥0.3 g/24 h | ≥0.3 g/24 h (unchanged) | | **Proteinuria threshold for "severe" preeclampsia** | ≥5.0 g/24 h | **Removed** — proteinuria level alone no longer defines severity | | **Rationale for change** | Proteinuria quantity poorly predicted outcomes | Severity defined by end-organ damage criteria, not proteinuria amount | ## Diagnostic Criteria for Preeclampsia (ACOG 2013) Preeclampsia is diagnosed when: - **Hypertension** (≥140/90 mmHg on 2 occasions ≥4 hours apart) **AND** - **Proteinuria** (≥0.3 g/24 h, or protein-to-creatinine ratio ≥0.3 mg/mg, or urine dipstick ≥2+) **OR** - **New-onset hypertension without proteinuria** + one or more severe features ### Severe Features Include (ACOG 2013): 1. Systolic BP ≥160 mmHg or diastolic BP ≥110 mmHg (on 2 occasions ≥15 min apart) 2. Platelet count <100,000/μL 3. Serum creatinine >1.1 mg/dL (or doubling from baseline without other renal disease) 4. Impaired liver function (elevated transaminases ≥2× normal) or severe persistent RUQ/epigastric pain 5. Pulmonary edema 6. New-onset headache unresponsive to medication, or visual disturbances **High-Yield:** The 2013 ACOG guidelines **removed** the ≥5.0 g/24 h proteinuria criterion for severe preeclampsia. The minimum threshold for diagnosing preeclampsia (with or without severe features) remains ≥0.3 g/24 h. Severity is now defined by end-organ involvement, not by the degree of proteinuria. **Clinical Pearl:** A woman with new-onset hypertension and ≥0.3 g/24 h proteinuria meets criteria for preeclampsia. Severe features are determined by BP ≥160/110, thrombocytopenia, renal insufficiency, hepatic dysfunction, pulmonary edema, or neurological symptoms — not by a higher proteinuria cutoff. *Reference: ACOG Practice Bulletin No. 202, Gestational Hypertension and Preeclampsia, 2019 (reaffirming 2013 criteria); Williams Obstetrics, 25th edition.*