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Test Code CA Calcium, LAB53


Cresolphthalein Complexone

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Green-top (lithium heparin) tube

Acceptable: Gold-top serum gel tube or plain red-top tube

Specimen Volume: 0.1 mL of  plasma or serum

Stability: Specimens may be kept at 2 – 8°C and analyzed within 7 days.  For longer storage,

                 samples may be frozen at -20°C for up to 6 months.


Reference Values

8.5-10.1 mg/dL

Critical values

0-7 days: <6.0 mg/dL or >12.0 mg/dL

>7 days: <6.0 mg/dL or >13.0 mg/dL

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


Useful For

Calcium measurements are used in the diagnosis and treatment of parathyroid disease, a variety of bone diseases, chronic renal disease, and tetany (intermittent muscular contractions or spasms).