D-Dimer Range Chart 2026 showing normal borderline elevated high and critical D-dimer levels mg/L

D-Dimer Range Chart 2026: Is Your Number Actually High — or Are You Using the Wrong Cutoff for Your Age, Pregnancy Status and Lab Units?

You got your D-dimer result. It says elevated. Before you spiral: 70% of US labs report in FEU units (cutoff 500 ng/mL), 30% use DDU (cutoff 250 ng/mL) — and if you don't know which yours used, you can't interpret your number correctly. Add age-adjusted cutoffs and pregnancy tiers, and most "elevated" results need far more context than Google can give. This hematologist-reviewed 2026 chart gives you that context.

Medical anatomy diagram showing how a facial exfoliator removes dead skin cells from the stratum corneum and stimulates new cell formation in deeper skin layers

Facial Exfoliator Guide 2026: AHA vs BHA by Skin Type & The Retinol Combination That Damages Most People’s Skin Barrier

Most people are unknowingly combining retinol with AHA exfoliators — a pairing dermatologists say is the single most common cause of damaged skin barriers in 2026. This guide covers AHA, BHA and PHA by skin type, the exact over-exfoliation warning signs to watch for, and the safe protocol that prevents the retinol mistake doctors see most often in clinic.