I tested positive to be under the influence of hydrocodone-free and blood test results of 76 ng/ml?

Are you asking us if you tested positive for this? Because I have to tell you, your question isn't very clear in what you're really looking for.

Yes I tested positive and facing dui controlled substance schedule 2 or 3 charges and want to know if 76 ng/ml is an extreme level? That was my blood test results and I have no prescription but was caught with 10 mg tabs of vicodin so I assume they are basing my levels on that dosage.

The blood test isn't based on dosage or milligrams, it's based on how much of it is in your blood.

You need an attorney, you could be facing felony charges since this was not your prescription.