Use

Detection of nonacute arsenic exposure in nail specimens. Arsenic accumulates in keratin-rich tissues such as nails, where levels can indicate exposure weeks to months prior. Nails grow slowly (approximately 0.1 inch/month), so distal clippings reflect exposure from about six months ago. Nail arsenic above 1.0 mcg/g dry weight may indicate excessive exposure; normal exposure results in trace amounts. ([mayocliniclabs.com](https://www.mayocliniclabs.com/test-catalog/Overview/89848?utm_source=openai))