Collect	Plain Red 10 mL
	Also Acceptable	Lavender (EDTA), pink (K2EDTA), green (sodium heparin), gray (sodium fluoride/potassium oxalate).
	Transport	Refrigerated
	Minimum Volume	4 mL Serum
	Remarks	Separate serum from cells to transport. Avoid use of separator tubes and gels. Measure at least two weeks after initiating treatment. Collect specimens eight to 12 hours after oral dose.

84022 *The CPT codes provided are based on the AMA guidelines and for informational purposes