Postpartum Proteinuria Management

Initial Assessment and Quantification

The American College of Cardiology recommends using spot urine protein-to-creatinine ratio (PCR) as the primary quantification method, with a threshold of ≥30 mg/mmol (≥0.3 mg/mg) defining significant proteinuria, according to the Hypertension guidelines 1
If PCR is unavailable, 24-hour urine collection remains acceptable, particularly when confirming nephrotic-range proteinuria (>3 g/24h), which has implications for thromboprophylaxis, as stated by the Hypertension guidelines 1
Dipstick testing alone is insufficient for diagnosis but provides reasonable assessment when values are ≥2+ (>1 g/L), especially if quantitative methods are unavailable, according to the Hypertension guidelines 1

Severity of proteinuria at delivery (especially >5 g/24h) predicts prolonged resolution time, as stated by the Hypertension guidelines 1 and the International Society for the Study of Hypertension in Pregnancy (ISSHP) guidelines 4

Proteinuria was present before 20 weeks gestation (suggests pre-existing disease, not preeclampsia), as stated by the International Society for the Study of Hypertension in Pregnancy (ISSHP) guidelines 3

The International Society for the Study of Hypertension in Pregnancy (ISSHP) guidelines recommend using pregnancy-safe agents initially (labetalol, methyldopa, nifedipine) if breastfeeding, and transitioning to standard antihypertensives after breastfeeding cessation or as clinically appropriate 3
The International Society for the Study of Hypertension in Pregnancy (ISSHP) guidelines advise against restarting ACE inhibitors or ARBs during breastfeeding without careful consideration 3