answer:Welcome to ask-public. Your question is confusing. Would you care to elaborate? In the first place, did you go to the emergency room for “blood pressure”? That’s uncommon, since most people with hypertension don’t even realize that until they’re informed by a doctor or suffer some other effect of high blood pressure. So I’m hoping to clarify what you mean by “BP” and why that would have driven you to go to the ER. There’s no information in your details of why a blood sample was drawn for a blood pressure event. One may assume why that was done, but without knowing why or what the lab was looking for there’s no indication of why the blood sample would be “no good”. Some samples can be contaminated by poor technique on the part of the sampler, or insufficient in quantity, I suppose, but that’s just speculation and guessing. As to the “7 sticks” required the next time, some patients present greater difficulty to the technicians and nurses drawing blood (that is, thinner and harder to find veins, or covered under thick layers of flesh in some patients), and some technicians given the job have less experience – and capability – than others, and all of those factors can contribute to the problem. And to the topic sentence of “why would blood cells seperate [sic]”, there’s nothing in the details presented to say anything about “separation”. While no one wants or expects you to give any detailed personal medical information (and even the doctors here don’t diagnose in these threads), there has to be a little more clarity for informed opinion.