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Test Code PTH INT Parathyroid Hormone (PTH), Intact, Plasma or Serum

Performing Laboratory

NRL-Chemistry

Methodology

Chemiluminescence Enzyme Immunoassay

Specimen Requirements

Submit only 1 of the following specimens: 

 

Specimen Type: Plasma

Container/Tube: Green top (heparin) or lavender top (EDTA)

Specimen Volume: 1 mL

Collection Instructions:

1. Fasting

2. Spin down within 2 hours of draw and transfer a minimum of 1 mL of cell-free heparinized or EDTA plasma to a plastic vial. Tightly cap vial immediately.

3. Store tightly capped specimen at ambient temperature (15° C-30° C) for no longer than 4 hours.
4. If assay will not be completed within 4 hours, refrigerate specimen at 2° C to 8° C for no longer than 8 hours.
5. If assay will not be completed within 8 hours, or for shipment of specimen, freeze at ≤20° C for no longer than 6 months.

6. Label specimen as plasma.

 

Specimen Type: Serum

Container/Tube: Gold top, serum gel

Specimen Volume: 1 mL

Collection Instructions:

1. Fasting

2. Spin down within 2 hours of draw and transfer a minimum of 1 mL of cell-free serum to a plastic vial. Tightly cap vial immediately.

3. Store tightly capped specimen at ambient temperature (15° C-30° C) for no longer than 4 hours.
4. If assay will not be completed within 4 hours, refrigerate specimen at 2° C to 8° C for no longer than 8 hours.
5. If assay will not be completed within 8 hours, or for shipment of specimen, freeze at ≤20° C for no longer than 6 months.

6. Label specimen as serum.

Reference Values

12-65 pg/mL

In the presence of normal renal function and hypercalcemia, an intact PTH level of >65 pg/mL is highly suggestive of primary hyperparathyroidism.

Day(s) Test Set Up

Monday through Sunday

Turnaround Time:

Routine-shift

Specimen Transport Temperature

Ambient ≤4 hours/Refrigerate ≤ 8 hours/Frozen OK 

Test Classification and CPT Coding

83970