PTH-Related Protein (PTHrP)

CPT: 83965
Hormones

What This Test Measures

Measures parathyroid hormone-related protein; elevated in humoral hypercalcemia of malignancy.

Preparation

No fasting required
Draw fasting in the morning. PTH follows a diurnal pattern, peaking at night. Calcium, Vitamin D, and phosphorus levels directly affect PTH — ideally draw all simultaneously.

General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.

Turnaround Time

Varies by lab

Clinical Notes

Mainly used in cancer-related hypercalcemia; DTC available through some platforms

ICD-10 Codes

Common diagnosis codes associated with this test. Codes are assigned by your provider.

E20.9Hypoparathyroidism, unspecified
E21.0Primary hyperparathyroidism
E83.52Hypercalcemia
N20.0Calculus of kidney

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Lab Codes

Proprietary codes used by each lab for this test.

ARUP Laboratories
2010677(order_code)
Quest Diagnostics
16793(order)

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For informational purposes only

This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.