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GLUCOSE, FASTING
MessageFor fasting specimens, patients must refrain from eating or drinking anything but water for a minimum of eight hours. If the patient has not fasted for 8 hours the collection process cannot continue. The grey top (potassium oxalate/sodium fluoride tube) is the preferred specimen collection container . Collect a full tube, following standard venipuncture techniques.
Test Code
LAB81 GLUF
Alias/See Also
GLUF
CPT Codes
82947| 82947
Includes
Certain medications may alter fasting specimen results.
Instructions
Processing Instructions (Lab use only): Centrifuge and separate cells after clot formation and within 4 hours of collection. Minimum Testing Volume: 0.1 mL Serum or Plasma Transport Temperature: Refrigerated Stability: Ambient: 2 daysRefrigerated : 7 daysFrozen: 1 days Causes for Rejection: Unlabeled, mislabeled, wrong tube type, QNS, hemolyzed.
Clinical Significance
1230130046
Last Updated: May 18, 2026