Test Details
Methodology
Ion-selective electrode (ISE)
Result Turnaround Time
1 - 2 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Use
Evaluate nonbound calcium, calcium metabolism, physiologically active calcium fraction, hyperparathyroidism, ectopic hyperparathyroidism. Occasionally useful when hypercalcemia coexists with abnormal protein state such as myeloma. Useful in assessing active calcium fraction in hypoproteinemia and acidosis when calcium is low.
Limitations
Total calcium remains the first line test for evaluation of calcium abnormality.
Footnotes
References
Custom Additional Information
Calcium in serum exists ionized, bound to organic anions such as phosphate and citrate, and bound to proteins (mainly albumin). Of these, ionized calcium is the physiologically important form. Measurement of serum ionized calcium provides insight into the effect of total protein and albumin on serum calcium levels. A patient can have high total calcium, with normal ionized calcium and increased total protein and/or albumin, as in dehydration or in myeloma. Women have greater circadian variation of ionized calcium and intact PTH than men.1 There is an inverse relationship between ionized calcium and phosphate concentration.2
Specimen Requirements
Specimen
Serum
Volume
1 mL
Container
Gel-barrier tube
Collection Instructions
Centrifuge and send unopened gel-barrier tube with vacuum intact. It is critical that the vacuum not be disrupted. Exposure of the serum to room air causes a loss of carbon dioxide to the atmosphere. This changes the sample pH and can prevent the lab from measuring the ionized calcium. To ensure that testing can be performed, send a separate tube for ionized calcium and adhere a piece of labeling tape over the top of the tube with the following written on it “Ionized Calcium − DO NOT OPEN.”
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 14 days |
Refrigerated | 14 days |
Reference Range
4.5−5.6 mg/dL
Storage Instructions
Room temperature. Do not freeze.
Causes for Rejection
Hemolysis; opened gel-barrier tube; gel-barrier not completely sealing the clot; plasma specimen; gross lipemia
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 004804 | Calcium, Ionized, Serum | 17864-0 | 004804 | Calcium, Ionized, Serum | mg/dL | 17864-0 |
| Order Code | 004804 | |||||
| Order Code Name | Calcium, Ionized, Serum | |||||
| Order Loinc | 17864-0 | |||||
| Result Code | 004804 | |||||
| Result Code Name | Calcium, Ionized, Serum | |||||
| UofM | mg/dL | |||||
| Result LOINC | 17864-0 |