Are you talking about going to a hospital or doctor's office for back pain?
Often times, when you go to a hospital, medical personnel will draw blood. If it's the ER, then they routinely do it to determine a "baseline," meaning where you're currently at medically speaking. This would not be the case if you are simply going into a doctor's office for a visit, but that's not to say that they may request it.
I'm curious why you ask?
Far too little information is furnished to answer. However, if this is about a criminal case, you need to refrain from any further discussion here or anywhere else online or in public or even in private except with your lawyer. Who is "they?"
Although AVVO describes this site as providing free legal advice, it is really a simple Q&A forum. The volunteer attorneys provide general answers. No specific legal advice is given here and no attorney-client relationship is established. For precise direction and legal advice, please consult in person with an attorney in your area. Be sure to bring all relevant paperwork with you.
Very Mystical question. Really Turns on who "they" is and the purpose of the hospital trip. Put a little meat on those bones and some of us will try to help you.
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