Observational Study of Decentralized Urine Optical Interaction Patterns Associated With Environmental Microplastic and Nanoplastic Exposure

This is a decentralized, observational, product-development study evaluating the EcoExposure™ platform for at-home urine sample collection, preparation, and smartphone-based imaging. The study is non-clinical and is not intended to diagnose, treat, or provide health risk assessments.

Approximately [X] adult participants will be enrolled for a duration of about 12 weeks. All activities are performed remotely using the participant's own smartphone and the TrialKit platform for electronic consent, guided workflows, image capture, and data submission.

Participants will collect and prepare fresh urine samples at home according to provided instructions, capture guided photographs of the prepared samples, and upload the images along with brief feedback. Sampling occurs at the following timepoints: Day 0 (baseline), daily from Day 7 through Day 14 (intensive short-term variability assessment), and then at Days 21, 28, 42, 56, 70, and 84.

An optional technical reference ("spike") sample may be offered. Participants who choose this option will add a small volume of a known-concentration reference solution to one of their prepared urine samples before imaging. This step is solely for internal assay and workflow evaluation and will not be used for any clinical interpretation.

Primary focus areas include participant adherence and completion rates, image quality and usability, workflow feasibility in a fully remote setting, and qualitative assessment of optical signal consistency over time (including comparison of native versus optionally spiked samples for internal development purposes only).