Non-invasive skin barrier function assessment
Dermatology & Aesthetics
≈ ¥20-50
(≈ $3-7)
15 min
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Description
Estimated cost for Non-invasive skin barrier function assessment at general public hospitals in China is about ¥15-40, and at Grade 3A hospitals about ¥20-50, varying by hospital tier and region.
Main Uses
Primary purposes include objective assessment of skin barrier integrity and functional status; monitoring disease activity and treatment response in inflammatory dermatoses (e.g., atopic dermatitis, rosacea, psoriasis); evaluating cosmetic product efficacy (moisturizers, barrier-repair formulations); guiding personalized skincare regimens; pre- and post-procedural skin evaluation in aesthetic dermatology; and clinical research on skin physiology and toxicology.
Normal Range
Transepidermal Water Loss (TEWL): 5–30 g/m²/h (varies by anatomical site, age, and environmental conditions); Skin Surface pH: 4.1–5.8 (typically 4.7–5.5 on healthy facial/forearm skin); Stratum Corneum Hydration (Water Content): 25–75 AU (arbitrary units; device-dependent, e.g., Courage+Khazaka CM 825 or MoistureMeter SC), with optimal range ~40–60 AU for normal adult facial skin.
Low Values - Possible Causes
1. Over-hydration or occlusion (e.g., prolonged use of occlusive ointments or plastic wrap); 2. Severe epidermal hyperplasia (e.g., chronic psoriasis plaques with thickened stratum corneum reducing water flux); 3. Technical artifact (e.g., improper probe placement, low ambient humidity, cold skin surface, or device calibration error); 4. Advanced age with reduced baseline TEWL in some individuals; 5. Use of highly astringent or alcohol-based products causing transient surface dehydration masking true hydration.
High Values - Possible Causes
1. Compromised skin barrier integrity (e.g., atopic dermatitis, contact dermatitis, irritant-induced damage); 2. Environmental stressors (low humidity, cold/dry air, UV radiation exposure); 3. Over-exfoliation (chemical or physical) or excessive cleansing disrupting lipid matrix; 4. Post-procedure inflammation (e.g., after laser resurfacing, chemical peels, or microneedling); 5. Xerosis, ichthyosis, or other inherited or acquired disorders of keratinization and lipid synthesis.