Submit the following supporting documents and information.
An official transcript of all undergraduate or higher courses. (In order to expedite the processing and evaluation of admissions, unofficial transcripts may be submitted. However, final, official transcripts and documentation of degree conferral are expected to be submitted as soon as possible.)
Contact information for three recommenders.
A statement of purpose

Applicants must include results of the Graduate Record Examination, preferably including an advanced test in one of the biological sciences. GRE or other test scores must be sent directly to the Catholic University Office of Graduate Admission from the testing service. Do not attach to the online application.

International Applicants
Attach original copies in the native language and translated forms of the following:

Grade reports
Certificates
Transcripts
English Proficiency, Proof of Funding
Both English proficiency and proof of funding documents must be presented to the Office of Graduate Admission either by postal mail or in person. These documents will not be accepted through the online application.

Minimally accepted TOEFL scores, when applying for graduate programs, are 550-paper, 213-computer, and 80 Internet. Students taking the TOEFL should have at least 20 out of 30 in each of the TOEFL subcategories. The minimally accepted graduate IELTS score is 6.5. Individual IELTS test module scores are also reviewed in addition to the overall IELTS score.