Antrim #15641, EPIC: LAB5342, CAION
Ionized Calcium is to be drawn before any tubes, including routine or fungal/AFB blood cultures.
Specimen Collection Criteria
One Gold-top SST tube (adults) or one SST Microtainer® (neonatal or pediatric). Minimum Whole Blood: 5.0 mL (Gold-top SST) or 0.3 mL (SST Microtainer®).* Also acceptable: One blood gas syringe (see Blood Gas Procedure below).**
See Minimum Pediatric Specimen Requirements.
*Venous or arterial blood is required for adults. If heel-stick is necessary in neonates or fingerstick in pediatrics, minimize exposure of the sample to air during collection.
**NOTE: Blood Gas specimens should ONLY be collected at the Dearborn, Farmington Hills, Grosse Pointe, Royal Oak, Taylor, Trenton, Troy or Wayne Hospital Campuses. Specimens should NOT be collected at any other Beaumont Laboratory draw-site, Nursing Home, or Outreach office.
Blood Gas Procedure:
Physician Office/Draw Specimen Preparation
SST tubes or Microtainers® only.
DO NOT remove Vacutainer® stopper. Let SST specimens clot 30-60 minutes then immediately centrifuge to separate serum from cells. Specimens must be centrifuged within one hour of collection. Refrigerated (2-8°C or 36-46°F) the centrifuged SST tube within four hours of collection.
Preparation for Courier Transport
Transport: Centrifuged SST tube, refrigerated (2-8°C or 36-46°F).
- Moderate to severely hemolyzed specimens.
- Specimens not collected and processed as indicated.
- Specimens collected in a Green-top (Heparin) Vacutainer® tube.
- Specimens will not be tested if the Vacutainer® stopper has been previously removed.
Inpatient Specimen Preparation
- Transport SST tubes or Microtainers® to the Laboratory immediately.
- If a blood gas specimen was collected, transport STAT, on wet ice, to the STAT Laboratory (Royal Oak) or the Chemistry Laboratory (Troy and Grosse Pointe).
SST tubes and Microtainers®: DO NOT remove Vacutainer® stopper. Let SST specimens clot 30-60 minutes then immediately centrifuge to separate serum from cells. Specimens must be centrifuged within one hour of collection. Deliver immediately to the appropriate testing station.
Blood Gas specimens: Immediately analyze the whole blood, heparinized, iced specimen upon receipt.
Specimen Stability for Testing:
Centrifuged SST Tubes and Microtainers® with Separator Gels
Room Temperature (20-26°C or 68-78.8°F): 4 hours
Refrigerated (2-8°C or 36-46°F): 48 hours
Frozen (-20°C/-4°F or below): Unacceptable
Blood Gas Syringes
Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): 1 hour
Frozen (-20°C/-4°F or below): Unacceptable
Specimen Storage in Department Prior to Disposal:
SST Tubes and Microtainers®: Refrigerated (2-8°C or 36-46°F) for 7 days.
Blood Gases: Specimens are disposed within 8 hours of testing.
Dearborn Chemistry Laboratory
Farmington Hills Chemistry Laboratory
Grosse Pointe Chemistry Laboratory
Livonia Main Laboratory
Lenox Main Laboratory
Royal Oak STAT Laboratory
Troy Chemistry Laboratory
Taylor Chemistry Laboratory
Trenton Chemistry Laboratory
Wayne Chemistry Laboratory
Sunday – Saturday, 24 hours a day.
Routine results available within 4 hours.
STAT results available within 1 hour after receipt in the STAT Laboratory (Royal Oak) or Chemistry Laboratories.
Age related reference range:
|0 – 1 day
||4.20 – 5.48
|2 – 3 days
||4.40 – 5.68
|4 – 5 days
||4.80 – 5.92
|6 days – adult
||4.48 – 5.28
Ionized calcium represents the free or physiologically active component of serum/plasma calcium. It frequently parallels the total calcium level. However, in plasma protein or acid-base abnormalities the ionized calcium often provides more useful information on calcium status than does total calcium. An increase in blood pH is associated with a decrease in ionized calcium; a decreased blood pH is associated with an increased ionized calcium. Patients with low calcium and low albumin frequently have normal ionized calcium levels. See total calcium for causes of hyper and hypocalcemia.
Low ionized calcium values may be seen in patients receiving rapid transfusion of citrated whole blood or blood products.
Ionized calcium is useful for the assessment of calcium status in patients with acid-base or plasma protein abnormalities and those in whom the total calcium result does not correlate with clinical finding. The ionized calcium assay provides useful information during liver transplantation surgery, cardiopulmonary bypass, or any procedure requiring rapid transfusion of whole blood.
LOINC: 17864-0, 38230-9, 59470-5
Livonia Laboratory – LVA
Lenox Laboratory – LNX
Main Laboratory –WYN
Chemistry Laboratory – TRN
Chemistry Laboratory – DBN
Chemistry Laboratory – TYL
STAT Laboratory – RO
Chemistry Laboratory – FH
Chemistry Laboratory – GP
Chemistry Laboratory – TR
Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.