PTH, Intact and Calcium : 8837

Test Code
PTHCAX or 8837


Alias/See Also
Immunoreactive PTH, Sandwich PTH Assay, PTH Whole Molecule, Intact Hormone, Monogram


CPT Codes
83970, 82310

Includes
Panel includes: PTH and calcium.


Instructions
Intact PTH: EDTA Lavender top tube.
AND 
Calcium: Serum separator tube or plain red top tube.   

Alternative specimen for PTH: Frozen serum.


Transport Container
PTH: Centrifuge the lavender top tube and aliquot 1.5 mL plasma (Min. 1.0 mL) into a standard transport tube and label as PLASMA.
 
CALCIUM: Centrifuge the serum separator tube and transport; if a plain red, centrifuge and aliquot 1.0 mL serum into a standard transport tube (Min. 0.5 mL) and label as SERUM.
      
Alternative specimen for PTH: 2 mL (Min. 1 mL) frozen serum aliquot from a SST or plain red top tube. Label as SERUM.


Transport Temperature
EDTA plasma for PTH amd serum for calcium: Refrigerated.
Serum for PTH: Frozen.


Specimen Stability
EDTA Plasma for PTH: Room temperature: 48 hours; Refrigerated: 72 hours; Frozen: 6 months

Serum for PTH: Room temperature: Unacceptable; Refrigerated: Unacceptable; Frozen: 6 months                      

Serum  for Calcium: Room temperature: 24 hours; Refrigerated: 7 days; Frozen: Acceptable


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis, Grossly lipemic, Sodium and Lithium Heparin plasma


Methodology
PTH: Immunoassay; Calcium: Spectrophotometry

Setup Schedule
Sunday - Saturday


Report Available
1 day


Reference Range
Parathyroid Hormone, Intact:
<1 Year         7-58 pg/mL
1-7 Years    12-55 pg/mL
8-18 Years  12-71 pg/mL
≥19 Years   14-64 pg/mL
   
Calcium:
8.7-10.4 mg/dL 
 
nterpretive Guide:
                                              Intact PTH                  Calcium
Normal Parathyroid           Normal                           Normal
Hypoparathyroidism          Low or Low Normal      Low
Hyperparathyroidism                   
  Primary                             Normal or High             High
  Secondary                         High                                 Normal or Low
  Tertiary                              High                                 High
Non-Parathyroid                  
    Hypercalcemia               Low or Low Normal        High
 


Clinical Significance
PTH, Intact and Calcium: Together these tests are useful in making the diagnosis of primary hyperparathyroidism, secondary hyperparathyroidism, and a differential diagnosis of hypercalcemia. These tests help in distinguishing hypercalcemia caused by either primary hyperparathyroidism or malignant disease.


Performing Laboratory
med fusion



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.