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PTH, Intact without Calcium : 35202
Test CodePTHX or 35202
CPT Codes
83970
Instructions
Perferred: EDTA Lvender top tube.
Alternative Specimen for PTH: Frozen serum.
Alternative Specimen for PTH: Frozen serum.
Transport Container
.Centrifuge the lavender top tube and aliquot 1.5 mL plasma (Min. 1.0 mL) into a standard transport tube and label as PLASMA.
Alternative Specimen: Centrifuge the serum separator tube and transport; if a plain red, centrifuge and aliquot 2.0 mL serum into a standard transport tube (Min. 1 mL) and label as SERUM. Freeze aliquot.
Alternative Specimen: Centrifuge the serum separator tube and transport; if a plain red, centrifuge and aliquot 2.0 mL serum into a standard transport tube (Min. 1 mL) and label as SERUM. Freeze aliquot.
Transport Temperature
EDTA plasma for PTH: Refrigerated.
Serum for PTH: Frozen.
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 PTH: Room temperature: Unacceptable; Refrigerated: Unacceptable; Frozen: 6 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross Hemolysis, Sodium and Lithium Heparin plasma
Methodology
Immunoassay
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
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
<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
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
This test is useful in making the diagnosis of primary hyperparathyroidism, secondary hyperparathyroidism, and a differential diagnosis of hypercalcemia. It may also help in distinguishing hypercalcemia caused by either primary hyperparathyroidism or malignant disease.
Performing Laboratory
med fusion
