Preferred Specimen(s)
0.3 mL serum

Transport Container
Serum Separator Tube (SST®)

Transport Temperature
Room temperature

Specimen Stability
Room temperature: 14 days
Refrigerated: 14 days
Frozen: 30 days

Methodology
Ion Selective Electrode (ISE)

Reference Range(s)
≤1 Week    3.2-5.5 mmol/L
8-27 Days    3.4-6.0 mmol/L
1-5 Months    3.5-5.6 mmol/L
6 Months-1 Year    3.5-6.1 mmol/L
2-19 Years    3.8-5.1 mmol/L
≥20 years    3.5-5.3 mmol/L