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Clinical infusion bypasses physiological barriers to directly deliver microplastics into human circulation

npj Emerging Contaminants 2026
X Zhao, Yutong Duan, Liyan Deng, Huaidong Du, Sheng Chen, Yueping Wang, Chunli Wan, Yudong Song, Xiaowei Wang, Changyong Wu

Summary

Researchers found that IV drips (like saline or glucose solutions) can release tiny plastic particles directly into your bloodstream, likely coming from the plastic bags and tubing used during infusion. A typical 5-day hospital IV treatment could deliver over 1,000 microplastic particles straight into your blood — skipping the body's natural filters like skin and gut, and packing in months' worth of the plastic exposure you'd normally get from breathing or eating. This suggests hospitals may need safer, plastic-free medical equipment to reduce an exposure route we hadn't been paying much attention to.

Polymers
PA
Body Systems
Respiratory

Intravenous infusion bypasses physiological barriers, directly introducing microplastics (MPs) into the bloodstream. Cleanroom simulations revealed MPs concentrations of 211 ± 34 (0.9% NaCl) and 179 ± 28 MPs/L (5% glucose), mostly < 20 µm in size, plus with 4–5 µg/L nanoplastics. Predominantly polyamide and polyvinyl alcohol, matching infusion materials. A 5-day infusion delivers > 1000 particles - equivalent to months of inhalation/ingestion exposure. This overlooked medical route necessitates safer materials and regulation.

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