Early morning specimen collection preferred
Allow specimen to clot, centrifuge and separate
Serum Separator Tube (SST)
Do not submit glass tubes
Lithium Heparin
Transport
*Pediatric data from J Clin Endocrinol Metab. 1991; 73:674-686 and J Clin Endocrinol Metab. 1989; 69;1133-1136.
6 to 8 days
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