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The Urine Ammonium-pH Index is a Measure of Kidney Tubular Function

Preprint C Not peer reviewed Observational

Key takeaways

This tested a simple urine measure, called the ammonium-pH index, that reflects how well the kidney's tiny tubes handle acid. In this study the measure predicted who would lose kidney function faster. It could become an early warning sign. It shows a link, not proof, and has not been peer-reviewed yet.

Source

Preprint · medRxiv nephrology preprints · 2026-08-10
https://www.medrxiv.org/content/10.64898/2026.08.06.26359870v1?rss=1