The Commonwealth is entitled to seek an amendment to the complaint so do not get comfortable thinking that the government is limited to charges as stated. There are numerous ways for the Commonwealth to proceed for a DUI and will depend on what is in your blood and your prior record for DUI. It is imperative that you retain an experienced criminal defense attorney to represent you.
The Commonwealth has the right to amend your charges provided that there is a factual basis to justify the modification. You would be well advised to contact an experienced attorney who, like me, routinely handles DUI matters; once your case is reviewed, they will be in the best position to advise you of your rights and any options that you may have.
Thank you for posting and best of luck!
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As has been stated the Commonwealth is permitted to request an amendment of the charges as they were originally filed by the officer. It ordinarily takes some time for blood test results to be available, so it is not uncommon for the charges to be amended at the prelim to reflect BAC results obtained through blood testing. Absolutely secure qualified DUI counsel to assist you. Depending upon many factors not addressed in your question, there may be a number of options open to you. Without competent legal counsel, you may well not be aware of/able to pursue those options. Good luck.
I typically say that 3 things can occur at a PH. All charges being dropped, some charges being dropped and some being held for trial and all charges being held for trial. Because the standard is so low, all charges being held over is the most likely outcome. However, charges can be amended or added based upon what is presented at the PH.