The University of Windsor says its Ts 4 Pee event is aimed at educating people about STIs and reducing the stigma of testing for them.
Those who participate are being tested for chlamydia and gonorrhoea, two common STIs, by providing a small amount of urine in a cup.
All participants will get a free t-shirt bearing the slogan "I peed today."
The Windsor-Essex County Health Unit will be collecting specimens and will follow up with participants privately if needed.
The university needs 517 students to take part in the exercise to break the current national record, which is held by Western University in London, Ont.
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