A generous supporter has approached the National Kidney Foundation of Maryland (NKF-MD) with a matching gift challenge. If NKF-MD raises $200,000 by Dec. 31, the supporter — a private foundation with ties to a local kidney transplant recipient —will match that figure dollar for dollar, providing $400,000 in vital funds for the Maryland, Delaware and West Virginia kidney community. One out of every nine Americans has chronic kidney disease, and most don’t know it. One in three Americans are at risk of developing kidney disease, and that risk increases to one in two over the course of a lifetime.