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Test Code PTHIN PTH, Intact, LAB108

Important Note

Please collect in a separate tube. Do not combine with any other tests.



Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

If PTH with minerals is needed, EDTA plasma can not be used for the mineral (calcium, phosphorus, creatinine) portion.




Preferred: Lavender-top (EDTA) tube

Acceptable: Plain, red top

Specimen Volume: 600 uL required

Stability: Samples should be centrifuged and separated immediately.  Keep tubes stoppered and upright at all times.  Freeze samples only once and mix thoroughly after thawing. 

Patient sample stability is outlined in the following table:


EDTA Plasma



48 hours

8 hours


72 hours

48 hours


6 months

6 months



Reference Values

15.0 - 65.0 pg/mL

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


Useful For

Measurement of intact PTH is useful in differentiating between hypercalcemia due to hyperparathyroidism and hypercalcemia of malignancy.  However, the assay is not intended as and should not be relied upon as a diagnostic indicator of malignancy.