Plasma
Light green-top (lithium heparin) gel tube
Serum
SST gold-top
Stability
Serum or plasma should be separated from the cells and analyzed as soon as possible.
| Storage | Temperature | Stability |
| Room temperature | 18-28° C (64 - 82°F) | Not recommended |
| Refrigerated | 2-8° C (36 - 46°F) | ≤7 days |
| Frozen | ≤ Negative 18° C (≤ Negative 0.4°F) | ≤7 days |
Enzymatic Assay
0.0-0.27 mmol/L
Critical value (automatic call-back): >7.0 mmol/L
Monday through Sunday
Available STAT
82010