|Specimen type:||Serum or plasma|
|Container:||Serum (red) gel or lithium heparin (green) gel|
|Specimen volume:||0.5 mL|
Collect on ice; centrifuge within 1 hour.
|Note:||Stable 7 days at 4-8 C|
|Reference value:||<15 Umol/L|
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