Kenyan marathon world-record holder Ruth Chepng'etich has been provisionally suspended by the Athletics Integrity Unit (AIU) following a positive test for hydrochlorothiazide (HCTZ), a banned diuretic and masking agent, in a urine sample dated 14 March 2025.

Chepng'etich made history at the 2024 Chicago Marathon, clocking a world record of 2:09:56—becoming the first woman to run under 2:10.

However, her achievements are now under scrutiny after HCTZ was detected in her urine at 3,800 ng/mL, vastly exceeding the minimum reporting threshold of 20 ng/mL.

AIU head Brett Clothier confirmed the unit issued a Notice of Charge and imposed the provisional suspension.

Although provisional suspensions under the World Anti‑Doping Code are not mandatory, Chepng'etich had already chosen to step aside voluntarily on 19 April as the investigation progressed.

Chepngetich now faces the possibility of a disciplinary tribunal. The AIU has not yet specified how long the process might take, and no date has been set for any hearings.

The outcome could threaten both her record and future participation in elite competitions.

As one of Kenya’s most celebrated long-distance runners—winner of multiple Chicago Marathons and the 2019 World Championship—Chepng'etich ’s suspension marks a major setback for athletics in Kenya.

The case also renews concerns about doping in road racing and the measures being taken to ensure clean sport.