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Test Code LAB108 Parathyroid Hormone (PTH), Intact, Serum

Additional Codes

46413

Reporting Title

Parathyroid Hormone Intact

Methodology

Roche Dianostics Electrochemiluminescence  Immunoassay System at Riverside

Siemens Diagnostics at OBL

Includes total calcium.

Useful as an aid in differential diagnosis of hypocalcemia and hypercalcemia.

Performing Laboratory

OhioHealth Laboratory Services-RMH and OBL Core Lab

Specimen Requirements

Draw blood in a gold-top serum gel tube(s). Spin down and send 1 mL of serum refrigerated in plastic vial. Avoid hemolysis.  

Note:

1. A speckled-top serum gel tube (s) or a plain, red-top tube(s) is also acceptable.

2. Because of nocturnal rise in intact PTH levels, specimen should be drawn in a.m. (after 7 a.m.) preferably following an overnight fast.

3. Hemolysis, elevated bilirubin, and lipemia interfere with this assay.

4. Heterophile antibodies may interfere with this assay.

 

Specimen Stability Information

Specimen Type Temperature Time
Plasma Refrigerated 3 days
  Ambient  2 days
  Frozen  6 months

 

Specimen Transport Temperature

Refrigerate/Ambient/FrozenOK

Reference Values

PTH, INTACT

12-65 pg/mL

 

CALCIUM, TOTAL

0-11 days:  7.6-10.4 mg/dL
12 days-2 years:  9.0-11.0 mg/dL

3-12 years:  8.8-10.8 mg/dL

>13 years:  8.4-10.2 mg/dL

Critical values: <6.0 mg/dL or >13.5 mg/dL

Call category: Always called within 1 hour

 

Note:  It is important to interpret PTH levels relative to total or ionized calcium levels. While PTH may be within normal limits, it may be inappropriately high or low relative to calcium level. Hyper- and hypocalcemia may be secondary to disordered vitamin D metabolism.

Day(s) Test Set Up

Monday through Sunday; Continuously

Test Classification and CPT Coding

82310 - calcium, total

83970 - PTH, intact