* This volume does not allow for repeat testing
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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82634