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Updated: Jun 1, 2026
03:57
Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
Published on: July 14, 2023
Comparison between whole and intact parathyroid hormone assays
Masatomo Taniguchi1, Motoko Tanaka, Takayuki Hamano
1Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan. masatomo@kcu.med.kyushu-u.ac.jp
Summary
The whole parathyroid hormone (PTH) assay may offer more precise PTH function evaluation than the intact PTH (iPTH) assay. Misclassification rates were significant, especially within target ranges, highlighting the need for assay consideration in dialysis patients.
Area of Science:
- Nephrology
- Endocrinology
- Clinical Chemistry
Background:
- The intact parathyroid hormone (iPTH) assay is standard for Japanese dialysis patients, measuring 1-84 PTH and non-1-84 PTH fragments.
- The whole PTH assay specifically measures 1-84 PTH, offering a potentially more accurate assessment of parathyroid hormone function.
Purpose of the Study:
- To evaluate the validity and clinical utility of both whole PTH and intact PTH assays in hemodialysis patients.
- To compare the performance of whole PTH and iPTH assays in assessing parathyroid hormone levels and their correlation with non-1-84 PTH fragments.
Main Methods:
- Simultaneous measurement of serum PTH using both intact and whole PTH assays in 738 hemodialysis patients.
- Calculation of non-1-84 PTH by subtracting whole PTH from iPTH values.
- Correlation analysis and Bland-Altman plots to compare assay performance and identify discrepancies.
Main Results:
- Both assays showed a high correlation (r=0.870), but the iPTH assay had a stronger correlation with non-1-84 PTH (r=0.791).
- A significant percentage of patients (18% overall, 28% within target ranges) were misclassified according to Japanese guidelines.
- Discrepancies between assays increased with higher serum PTH levels, suggesting potential inaccuracies in iPTH measurements at elevated levels.
Conclusions:
- While both assays correlate well, the whole PTH assay may provide a more precise evaluation of parathyroid hormone function.
- Assay choice is critical, as misclassification rates can impact clinical management and adherence to treatment guidelines in dialysis patients.
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