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Reports about clinical research study results are often in the news, but it can be difficult to find out about studies that are in progress. If you or a loved one has a rare condition, you may be interested in participating in a research study. This guide can help you find current research studies.

Individuals and families affected by rare medical conditions might look to nonprofit support and advocacy groups for different reasons. Some may want to find other people who understand how having the condition affects their lives. Others are searching for medical information, treatment options, the latest research, or financial aid resources. This guide will help you learn more about the different types of information and services offered by nonprofit support and advocacy groups.

ATSDR's Substance-Specific Priority Data Needs (PDNs)

An MRL is an estimate of the daily human exposure to a hazardous substance that is likely to be without appreciable risk of adverse noncancer health effects over a specified duration of exposure. These substance-specific estimates, which are intended to serve as screening levels, are used by ATSDR health assessors and other responders to identify contaminants and potential health effects that may be of concern at hazardous waste sites.