A 32-year-old multigravida at 24 weeks of gestation attends her routine antenatal visit. Her blood pressure is 148/96 mmHg (baseline 110/70 mmHg). Urine dipstick shows 2+ proteinuria. Full blood count and liver function tests are normal. Serum creatinine is 0.9 mg/dL. What is the most appropriate next step in management?

Explanation

## Clinical Presentation The patient presents with: - Elevated BP (148/96 mmHg) with baseline normal (110/70 mmHg) → rise of ≥30 mmHg systolic or ≥15 mmHg diastolic - Proteinuria (2+) - Normal renal and hepatic function - Gestation 24 weeks (viable, but preterm) This constellation suggests **possible preeclampsia**, but diagnosis requires confirmation. ## Diagnostic Criteria for Preeclampsia **Key Point:** Preeclampsia is defined as new-onset hypertension (≥140/90 mmHg) after 20 weeks PLUS proteinuria (≥0.3 g/24 h) or other features of end-organ dysfunction. Diagnosis must be confirmed before treatment escalation. **High-Yield:** A single elevated BP reading does NOT diagnose hypertension in pregnancy. Repeat measurement after 15 minutes is mandatory to exclude white-coat effect or transient elevation. ## Diagnostic Algorithm at 24 Weeks with Suspected Preeclampsia ```mermaid flowchart TD A[BP ≥140/90 + Proteinuria at 24 weeks]:::outcome --> B[Repeat BP after 15 min rest]:::action B --> C{BP still ≥140/90?}:::decision C -->|No| D[Likely white-coat effect<br/>Routine follow-up]:::outcome C -->|Yes| E[Confirm diagnosis:<br/>24-hour urine protein<br/>or spot urine PCR]:::action E --> F{Proteinuria ≥0.3 g/24h<br/>or PCR ≥30 mg/mmol?}:::decision F -->|Yes| G[Preeclampsia confirmed<br/>Assess severity]:::outcome F -->|No| H[Gestational hypertension<br/>Outpatient monitoring]:::outcome G --> I{Severe features present?<br/>Symptoms, labs abnormal}:::decision I -->|Yes| J[Admit, antihypertensives,<br/>Corticosteroids, plan delivery]:::action I -->|No| K[Outpatient monitoring<br/>with frequent visits]:::action ``` ## Why 24-Hour Urine Protein is Next Step | Step | Rationale | |------|----------| | **Repeat BP** | Exclude white-coat effect; single reading insufficient for diagnosis | | **24-hour urine protein** | Confirm proteinuria objectively; diagnostic criterion for preeclampsia | | **Assess severity** | Normal labs (Cr, LFTs, CBC) suggest non-severe preeclampsia if confirmed; guides outpatient vs. inpatient management | **Clinical Pearl:** At 24 weeks with suspected preeclampsia but normal end-organ function tests, expectant management with close monitoring is appropriate if non-severe. Delivery is indicated only if severe preeclampsia, fetal compromise, or maternal indication arises. **Mnemonic:** CONFIRM FIRST — **C**onfirm diagnosis; **O**btain 24-h urine; **N**ormal labs reassure; **F**requent follow-up; **I**npatient if severe; **R**epeat BP; **M**onitoring outpatient; **F**etal assessment; **I**ntervention only if indicated; **R**eview at each visit; **S**teroids if <34 weeks; **T**herapy escalate if worsening. ## Management Principles at 24 Weeks (Preterm) 1. **Confirm diagnosis** with 24-hour urine protein before initiating antihypertensives. 2. **Assess severity** using clinical and laboratory criteria. 3. **If non-severe preeclampsia:** expectant management with antepartum fetal monitoring, twice-weekly BP checks, and corticosteroids if delivery anticipated before 34 weeks. 4. **If severe preeclampsia or maternal/fetal indication:** admit, initiate antihypertensives, administer corticosteroids, plan delivery at 34 weeks or earlier if unstable.