Welcome to the forum.
"If I have hepatitis C, wouldn't it have shown up in the blood
work done from the ER,"
No, the Hepatitis would not show up in the blood
they did in the ER because they most likely did not do a test to see if you had
"Would the tetanus shot have done anything to the blood
No, it would not.
"I really don't see how I could have it anyways."
Not to be flip, but join the crowd.