What PTE score do you need for Northern Illinois University?

The graduate page says that if you are admitted you must have your test score sent to NIU from the testing centre, and that NIU does not need a department code. Neither page mentions PTE Academic Online or PTE Core, and neither states a separate validity period for PTE, so book the standard PTE Academic and check with admissions if you plan to use another version.

For comparison, the same graduate page asks IELTS 6.5 against PTE 53, and the undergraduate page asks an IELTS overall band of 6.0 against PTE 48.

For graduate admission, NIU's graduate page lists completion of ELS English for Academic Purposes (EAP) Level 112 as an alternative to a test score. It also lists the countries where a degree means no TOEFL or IELTS score is needed.

Requirements vary by programme and change between admissions cycles. The score that binds you is the one on your NIU programme page and in your offer letter, so check it there before you book a test.