Can you have an abortion without parental consent?

At 16 can you have an abortion without parental consent? Also how much is the average abortion? I am in the United States. I am not pregnant but if the problem were to arise I want to know the facts.
Update: I hate your smart *** comments. But whatever. Thanks to everyone trying to be helpful. I meant as in I thought I was pregnant but found out I wasn't. But if I had been pregnant then I would need to know this.
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