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Calcium, total, Serum / Plasma
|Performed by||Parnassus & Mt. Zion Chemistry|
|In House Availability||Test available 24 hours per day 7 days per week|
|Container type||Gold top or Light Green top|
|Amount to Collect||1 mL blood Click here for Microdetermination info|
|Sample type||Serum or plasma|
|Preferred volume||0.5 mL serum or plasma|
|Min. Volume||0.2 mL serum or plasma Click here for Microdetermination info|
1. Normal range for children 0-1 year adopted from Beckman Coulter's "Pediatric Reference Range Guidelines for Synchron Systems" Bulletin 9345
2. Normal range for adults used for children >1 year. Beckman Coulter's "Pediatric Reference Range Guidelines for Synchron Systems" Bulletin 9345 for 1-3 year olds and Tietz', "Fundamentals of Clinical Chemistry" 5th ed, 2001, for 2-12 year olds showed reference intervals comparable to adult range.
3. Normal range for adults was determined by testing 270 male and female healthy blood donors at UCSF.
|Critical value||< 6.5 mg/dL or > 13.5 mg/dL|
|Stability||Room temperature 8 hours, refrigerated 2 days, frozen at -20C 1 week|
|Turn around times||STAT 1 hour, Routine 4 hours|
|Additional information||To convert mg/dL to mmol/L (SI units) multiply by 0.25
A value < 4 or > 15 will automatically be reassayed
Gadolinium MR contrast agents including Gadodiamide (Omniscan), Gadoversetamide (Optimark), Gadopentetate Dimeglumine (Magnevist), and Gadoterdiol (Prohance), have been shown to interfere with certain colorimetric assays used in the measurement of various serum cations including iron, magnesium, and calcium. The UCSF clinical labs use electrode methods for measurement of total and ionized calcium levels which have not been reported to be subject to the gadolinium interference.
Reference:Proctor et al. Gadolinium Magnetic Resonance contrast Agents produce Analytic Interference in Multiple Serum Assays. Am J Clin Pathol. 2004;121:282-292.
|Last Updated||2/17/2012 9:56:56 AM|
|Lab Procedure Link||Click here for Procedure|