Centralized Core Laboratory:Chemistry
Gray top (fluoride/heparin) tube
Cause for rejection:
Specimen not received on ice, specimen not delivered to lab within 2 hours of collection.
Daily, 24 hours; STAT
Enzymatic, colorimetric method
Patient should not exercise 30 minutes prior to collection. Try to collect sample without using a tourniquet. If this is not possible, apply a tourniquet for no longer than 3 minutes. Do not instruct patient to "clench and unclench fist" to pump the vein. Place specimen on ice and deliver to lab immediately.
OC Power Word:
Reference range: 0.5-2.2 mmol/L