A Wisconsin teenager’s life was turned upside down after he went to donate blood for the first time.

Sixteen-year-old David Sczesny went to make the donation this summer when it was discovered he had a rare form of bone marrow cancer, the Milwaukee news station WTMJ reported.

“It was a big shock. I wasn't expecting that at all,” the high school junior told WTMJ.

Although doctors caught the cancer early, David still needs a bone marrow transplant to keep him alive, which could be challenging because of his rare blood type.

“I am hopeful, I really am, that there is someone there for David,” the teen’s mom told the news station.

The family is holding a blood drive and marrow registry this weekend.

Click here to read more from WTMJ.