Urine hemosiderin: a novel marker to assess the severity of chronic venous disease., Zamboni etc al, Vasc Surg. 2003

"CONCLUSIONS:
Determination of presence of hemosiderin in the urine is a new, sensitive, cost-effective, noninvasive, and repeatable test that enables detection of substantial microcirculatory overload in patients with CVI." https://www.ncbi.nlm.nih.gov/pubmed/12514590

J Vasc Surg. 2003 Jan;37(1):132-6. Research Support, Non-U.S. Gov't