Special Blood Collections: Glucose Tolerance Test

Collection tubes

  • Blood may be collected into either:
  • Red top (clot) tubes.
  • Speckle top tubes (serum separator tube).
  • Gray top tubes specifically designed to preserve glucose levels.
  • Gray top tubes contain additives such as sodium fluoride or potassium oxalate, which prevent metabolism of glucose by blood cells.

Earn ASCLS P.A.C.E.® credits for your AMT, ASCP, or NCA recertification requirements.

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