Overview: Intact Parathyroid Hormone TestIntroduction: The Intact Parathyroid Hormone Test measures intact PTH to diagnose parathyroid or bone disorders, causing fatigue. Aligned with 2023 Endocrine Society guidelines, it uses biochemical methods for high specificity, supporting hormonal screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in endocrinology for patients with suspected hyperparathyroidism or hypoparathyroidism.
Other Names: Intact PTH Assay, PTH Test.
FDA Status: Laboratory-developed test (LDT), meeting endocrinology standards for diagnostic accuracy.
Historical Milestone: PTH testing began in the 1960s with parathyroid research. Biochemical methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures intact PTH to diagnose parathyroid or bone disorders, guides treatment, and evaluates patients with fatigue.
Test Parameters: 1. Intact PTH Level
Pretest Condition: Fasting for 10-12 hours required. Collect serum or plasma. Report history of fatigue, bone pain, or parathyroid symptoms.
Specimen: Serum (SST, 2-5 mL), Plasma (EDTA, 2-4 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document fatigue, bone pain, or history of parathyroid/bone disorders. Include current medications, especially calcium supplements.
Consent: Written consent required, detailing the tests purpose, parathyroid/bone disorder implications, and risks of sample collection.
Procedural Considerations: Uses immunoassays to measure intact PTH levels. Results are available in 1-2 days, supporting clinical decisions. Performed in laboratories, often for parathyroid diagnosis.
Factors Affecting Result Accuracy: Improper fasting or sample hemolysis can affect results. Vitamin D deficiency may alter PTH levels.
Clinical Significance: Abnormal PTH levels confirm parathyroid disorders, guiding surgery or supplementation. Normal levels may require calcium or vitamin D testing.
Specialist Consultation: Consult an endocrinologist for result interpretation and treatment planning.
Additional Supporting Tests: Serum calcium, vitamin D, or bone density scan to confirm parathyroid/bone disorder diagnosis.
Test Limitations: Non-specific for certain conditions; clinical correlation is needed. Sample quality affects sensitivity.
References: Endocrine Society Parathyroid Guidelines, 2023; Journal of Clinical Endocrinology, Bilezikian JP, 2022.
