Denne side blev automatisk oversat, og nøjagtigheden af ​​oversættelsen er ikke garanteret. Der henvises til engelsk version for en kildetekst.

Assessment of Urinary Microplastic Concentration in Patients With Urolithiasis: A Prospective Case-Control Study (Microplastics)

20. september 2026 opdateret af: Mehmet Serkan Ozkent, Konya City Hospital

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.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

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.

Undersøgelsestype

Observationel

Tilmelding (Anslået)

100

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

  • Navn: Mehmet Serkan S ÖZKENT, MD
  • Telefonnummer: +90 5059364155
  • E-mail: msozkent@gmail.com

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

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.

Beskrivelse

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.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Observationsmodeller: CASE_CONTROL
  • Tidsperspektiver: PROSPECTIVE

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
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.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Urinary Microplastic Burden
Tidsramme: 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
Tidsramme: 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

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Association Between Urinary Microplastic Burden and Stone Size
Tidsramme: 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
Tidsramme: 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

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Efterforskere

  • Ledende efterforsker: Mehmet Serkan Özkent, MD, Konya City Hospital
  • Ledende efterforsker: Batuhan Ağrulu, MD, Konya City Hospital

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

1. september 2026

Primær færdiggørelse (Anslået)

1. september 2027

Studieafslutning (Anslået)

1. september 2027

Datoer for studieregistrering

Først indsendt

20. september 2026

Først indsendt, der opfyldte QC-kriterier

20. september 2026

Først opslået (Faktiske)

25. september 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

25. september 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

20. september 2026

Sidst verificeret

1. september 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • KSH-2026/166

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .