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Physician Referrals

How to Refer Your Patients

How to Refer a Patient

Please contact the NIEHS Clinical Research Unit recruitment line to find out if your patient's diagnosis may be of interest to study investigators. Call 1-855-696-4347 or e-mail us at

If your patient's disease is under active investigation, you may be asked to submit the diagnosis and medical history in writing to the principal investigator. If medical records are in a language other than English, an English translation should be provided. In cases where translation is not feasible, a clearly typed summary in the foreign language (typically, 3 - 5 pages) containing pertinent information about the case is recommended.


Patients accepted to participate in a clinical research study are not asked to pay for their medical, surgical, and other in-patient care. Patients must usually pay for their own transportation to the NIEHS Clinical Research Unit in Durham, North Carolina, but may be reimbursed for mileage expense, based on the specific study. All patients will be compensated for their time and effort, which varies based on the specific study.


  • Patients may be referred by a physician or dentist in private practice, hospital, clinical, or other medical organization.

  • The patient's specific disease or condition must be under active investigation for diagnosis and treatment to be considered for enrollment to a study.

  • Study investigators consider age, weight, sex and general health for qualified patients as criteria for enrollment. Apart from particular medical considerations, there are no other restrictions based on race, creed, age, sex, or color.

  • Patients must have a responsible understanding of their role in a research study.

How Do I Get More Information on Referring a Patient to a Study?

If you would like to refer a patient to an NIEHS research study or have questions about any of the research studies conducted at the NIEHS Clinical Research Unit, call the NIEHS Clinical Research Unit recruitment line at 855-696-4347 or email us at

Last Reviewed: May 19, 2023