The gel tubes that I am familiar with (from Becton Dickinson)
may not function properly if they are maintained at 37C. At "warm"
temperatures and on occasion in un-refrigerated centrifuges, the gel
tends to partially decompose, releasing an oil onto the surface of the
serum. We don't see this problem if blood (at 37C) is collected and the
tubes are maintained at room temperature prior to centrifugation (at
22C), but I expect that if the tubes and the centrifuge are maintained
at 37C, the gel could decompose.
Andrew
Dr. Andrew W. Lyon, Clinical Biochemist / Home Office
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