Assessment of Urinary Microplastic Concentration in Patients With Urolithiasis: A Prospective Case-Control Study (Microplastics)
Quantitative and Qualitative Evaluation of Urinary Microplastic Load in Patients With Kidney/Ureteral Stones: A Single-Center Prospective Case-Control Study
This prospective observational case-control study aims to evaluate the presence and burden of microplastic particles in urine samples from patients with kidney and ureteral stones and to compare these findings with healthy controls. The study will also investigate the associations between urinary microplastic burden and clinical characteristics of urinary stone disease, including stone size, stone density measured in Hounsfield units (HU), localization, and stone composition.
Aperçu de l'étude
Statut
Les conditions
Intervention / Traitement
Description détaillée
Urinary stone disease is a common urological condition with a multifactorial etiology. Although established metabolic, dietary, genetic, and environmental factors contribute to stone formation, the potential role of microplastic exposure in urinary stone disease remains insufficiently understood.
In this prospective observational case-control study, patients diagnosed with kidney or ureteral stones and healthy control participants will be evaluated. Following informed consent, demographic and clinical data will be collected. A midstream urine sample will be obtained from each participant for laboratory analysis.
Urine samples will undergo laboratory processing for the detection and characterization of suspected microplastic particles. The analytical process will include centrifugation, Proteinase K treatment, membrane filtration, microscopic examination, image analysis using ImageJ, and Fourier-transform infrared (FTIR) spectroscopy for polymer identification.
In participants with urinary stones, available stone specimens will also be analyzed for stone composition. Imaging-derived stone characteristics, including stone size, localization, and density in Hounsfield units, will be recorded.
The primary objective is to compare urinary microplastic burden between participants with urinary stones and healthy controls. Secondary analyses will investigate the relationships between urinary microplastic burden and stone characteristics, including stone size, density, localization, and composition.
The study does not involve administration of investigational drugs, use of investigational medical devices, or additional invasive procedures. Participation will involve collection of a urine sample and collection of clinical data obtained during routine clinical care.
Type d'étude
Inscription (Estimé)
Contacts et emplacements
Coordonnées de l'étude
- Nom: Mehmet Serkan S ÖZKENT, MD
- Numéro de téléphone: +90 5059364155
- E-mail: msozkent@gmail.com
Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
Méthode d'échantillonnage
Population étudiée
The study population will consist of adult participants with kidney or ureteral stones and healthy control participants. Participants in the urinary stone group will have a diagnosis of kidney or ureteral stone disease. Healthy controls will have no current or previous diagnosis of urinary stone disease. Participants will be recruited prospectively from the study center and will provide informed consent before enrollment. Midstream urine samples will be collected from all participants for microplastic detection and characterization. Clinical and demographic data will be recorded for the urinary stone group, including stone size, localization, and stone density measured in Hounsfield units.
La description
Inclusion Criteria:
- Participants will be eligible if they are 18 years of age or older, are able to provide informed consent, and meet the criteria for either the urinary stone group or the healthy control group. Participants in the urinary stone group will have a diagnosis of kidney or ureteral stone disease. Healthy controls will have no current or previous diagnosis of urinary stone disease.
Exclusion Criteria:
- Participants will be excluded if they are unable or unwilling to provide informed consent, have an active urinary tract infection at the time of urine sample collection, are pregnant, or are unable to provide an adequate urine sample for laboratory analysis. Participants will also be excluded if the urine sample is considered unsuitable or significantly contaminated during laboratory processing.
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
- Modèles d'observation: CASE_CONTROL
- Perspectives temporelles: PROSPECTIVE
Cohortes et interventions
Groupe / Cohorte |
Intervention / Traitement |
|---|---|
|
Urinary Stone Group
Participants diagnosed with kidney or ureteral stones will be included in this group. Demographic and clinical data, including age, sex, body mass index, stone size, stone localization, and stone density measured in Hounsfield units, will be recorded. Midstream urine samples will be collected for microplastic detection and characterization. When available, stone specimens obtained during routine clinical treatment will be analyzed for stone composition. |
This is an observational study. No study-specific intervention will be assigned to participants. |
|
Healthy Control Group
Participants without current or previous urinary stone disease will be included in this group. Demographic and relevant clinical data will be recorded. Midstream urine samples will be collected and analyzed using the same laboratory procedures as those applied to the urinary stone group for detection and characterization of microplastic particles. |
This is an observational study. No study-specific intervention will be assigned to participants. |
Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
|
Urinary Microplastic Burden
Délai: At enrollment
|
Urinary microplastic burden will be assessed as the number of confirmed microplastic particles detected per milliliter of urine (particles/mL). Microplastic particles will be identified by microscopic examination and confirmed by FTIR spectroscopy based on polymer characteristics. The urinary microplastic burden will be compared between the urinary stone group and the healthy control group. |
At enrollment
|
|
Microplastic Polymer Type
Délai: At enrollment
|
The polymer types of confirmed microplastic particles detected in urine samples will be identified by FTIR spectroscopy and reported according to polymer type, including polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and other identified polymers. |
At enrollment
|
Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
|
Association Between Urinary Microplastic Burden and Stone Size
Délai: At enrollment
|
The association between urinary microplastic burden and maximum urinary stone diameter will be evaluated in participants with kidney or ureteral stones. |
At enrollment
|
|
Association Between Urinary Microplastic Burden and Stone Density
Délai: At enrollment
|
The association between urinary microplastic burden and urinary stone density measured in Hounsfield units (HU) on computed tomography will be evaluated in participants with kidney or ureteral stones. |
At enrollment
|
Collaborateurs et enquêteurs
Parrainer
Les enquêteurs
- Chercheur principal: Mehmet Serkan Özkent, MD, Konya City Hospital
- Chercheur principal: Batuhan Ağrulu, MD, Konya City Hospital
Publications et liens utiles
Publications générales
- https://doi.org/10.1186/s12989-026-00661-0
- Agarwal DK, Lulich JP, Furrow E, Simcik M. Microplastic Particles Are Present in Mammalian Urolithiasis. Journal of Urology. doi:10.1097/01.JU.0001109956.38240.97.13.
- O'Callaghan L, Olsen M, Tajouri L, Beaver D, Hudson C, Alghafri R, McKirdy S, Goldsworthy A. Plastic induced urinary tract disease and dysfunction: a scoping review. J Expo Sci Environ Epidemiol. 2025 Sep;35(5):770-784. doi: 10.1038/s41370-024-00709-3. Epub 2024 Aug 31.
- de Oliveira RB, Pelepenko LE, Masaro DA, Lustosa GMMM, de Oliveira MC, Roza NAV, Marciano MA, Dos Reis LM, Kamel S, Louvet L, Mazon T. Effects of microplastics on the kidneys: a narrative review. Kidney Int. 2024 Sep;106(3):400-407. doi: 10.1016/j.kint.2024.05.023. Epub 2024 Jun 18.
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude (Estimé)
Achèvement primaire (Estimé)
Achèvement de l'étude (Estimé)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Réel)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Mots clés
Termes MeSH pertinents supplémentaires
- Maladies urogénitales
- Maladies urogénitales masculines
- Calculs
- Conditions pathologiques, anatomiques
- Maladies rénales
- Maladies urologiques
- Maladies urogénitales féminines
- Maladies urogénitales féminines et complications de la grossesse
- Calculs urinaires
- Néphrolithiase
- Conditions pathologiques, signes et symptômes
- Calculs rénaux
- Urolithiase
Autres numéros d'identification d'étude
- KSH-2026/166
Plan pour les données individuelles des participants (IPD)
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Informations sur les médicaments et les dispositifs, documents d'étude
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