Could be a cord blood banked collection that some parents consent to (and pay for). https://www.stanfordchildrens.org/en/topic/default?id=cord-blood-banking-16

Could be a cord blood banked collection that some parents consent to (and pay for). https://www.stanfordchildrens.org/en/topic/default?id=cord-blood-banking-160-48 https://www.stanfordchildrens.org/en/topic/default?id=cord-b... Edit: about half way through the article, it appears to be a sample from newborn screening, but another thing to think about.