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Test Code BLOD0553 Calcium, Plasma or Serum

Useful For

The diagnosis and monitoring of a wide range of disorders including diseases of bone, kidney, parathyroid gland, or gastrointestinal tract   Calcium levels may also reflect abnormal vitamin D or protein levels.


Bichromatic End point

Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Plasma or serum
Container/Tube: Light-green top (lithium heparin gel), red top, or gold top
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.5 mL

Collection Instructions:  Allow specimen to clot completely.  Spin down and separate cells from serum or plasma within 2 hours of collection.

Specimen Transport Temperature


Specimen Stability


Specimen Type Temperature Time
Plasma or Serum Refrigerated 3 days
  Frozen 6 months


Reference Values

8.3-10.1 mg/dL

Critical values (automatic call-back): <6.0 mg/dL or  >14.0 mg/dL


Note:  If the patients albumin concentration is low or high, a corrected calcium level will be reported.  Calcium in serum is bound to proteins, principally albumin. As a result, the total serum calcium concentration in patients with low or high serum albumin levels may not accurately reflect the physiologically important ionized (or free) calcium concentration. It is important to verify with repeat measurement (ionized calcium or total serum calcium corrected for albumin) that there is a true decrease in the serum calcium concentration. If the patient has a low albumin-corrected serum calcium or ionized calcium concentration, further evaluation to identify the cause is indicated.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding