|Alternate:||Free Calcium; Unbound Calcium; Filterable Calcium; Ionic Calcium|
|Available:||Daily, 24 hours|
|Container:||yellow microtainer tube|
|Temperature:||Transport to laboratory within 30 minutes of collecting.|
|Rejection:||Wrong tube type.|
|Normal:||1.10 - 1.35 mmol/L|
|Uses:||Evaluation of nonbound calcium, calcium metabolism, physiologically active calcium fraction, primary hyperparathyroidism, ectopic hyperparathyroidism.|
|Limitations:||Squeezing of the puncture site should be avoided as this will cause hemolysis of the sample and contamination with extravascular fluid which is more acidic than blood. The capillary tube must be completely filled with blood and contain no air bubbles. Incompletely filled capillaries will affect the accuracy of the Ca++ and pH measurement. The capillary should then be mixed by gently rolling it between finger and thumb.|
|Method:||Ion selective electrode|
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