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Updated: Jun 10, 2026
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Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
Published on: February 9, 2021
Does urinary stone composition and morphology help for prediction of primary hyperparathyroidism?
Hassan Bouzidi1, David de Brauwere, Michel Daudon
1Laboratoire de Biochimie, Hopital Universitaire Tahar Sfar, Mahdia, Tunisia.
Summary
Primary hyperparathyroidism (HPT) significantly alters kidney stone composition and morphology. HPT patients show more calcium-dependent stones, like brushite, and distinct stone structures compared to non-HPT individuals.
Area of Science:
- Nephrology
- Urology
- Biochemistry
Background:
- Primary hyperparathyroidism (HPT) is a frequent cause of kidney stones (urolithiasis).
- Limited data exist on the specific stone composition and morphology in HPT patients.
Purpose of the Study:
- To compare the stone composition and morphology between patients with and without HPT.
- To investigate differences in stone characteristics between HPT, idiopathic hypercalciuria (IH), and non-HPT stone formers.
Main Methods:
- Comparative analysis of kidney stone composition and morphology.
- Study included 264 HPT patients and 24,567 non-HPT stone formers, with a subgroup of 1,356 IH patients.
- Excluded uric acid and struvite stones.
Main Results:
- Calcium oxalate (CaOx) stones were less frequent in HPT patients (51.9%) versus non-HPT (82.2%).
- HPT and IH patients showed altered CaOx crystalline phases (whewellite/weddellite predominance) and increased brushite and carbapatite compared to non-HPT.
- Distinct stone morphologies (IVd, IVa+II) were more common in HPT patients.
Conclusions:
- HPT is associated with a higher proportion of calcium-dependent crystalline species, particularly brushite.
- Specific stone morphologies are characteristic of HPT patients, differing from those with idiopathic hypercalciuria.
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