Ionized calcium provides a more physiologically accurate assessment of calcium especially in the presence of high protein concentrations, hyperparathyroidism and hypoparathyroidism.
3 mL (1 mL min.) Whole blood from 1 Green Top (Sodium Heparin) tube OR 2 mL (0.5 mL min.) Serum from 1 SST. Avoid use of tourniquet and fist clenching during sampling. Overnight fasting is preferred. Ship refrigerated. DO NOT FREEZE.
ISE
Sample Daily by 3 pm; Report Same day
Ionized calcium provides a more physiologically accurate assessment of calcium especially in the presence of high protein concentrations, hyperparathyroidism and hypoparathyroidism.