Test that resulted in adverse finding for Chris Froome called into question

• Study claims it is unfeasible to accurately measure level of salbutamol
• Froome under scrutiny for adverse finding at 2017 Vuelta

Chris Froome’s battle to rescue his reputation after a failed drugs test looks bound for the court of arbitration for sport as it emerged that a study calling into question the efficacy of the test will form a key part of his defence.

The 32-year-old is competing in the Giro d’Italia with Team Sky as he bids to win a historic third successive Grand Tour. He won last year’s Tour de France and the Vuelta a España. In December the Guardian and Le Monde revealed a urine test submitted after stage 18 of the Vuelta showed excessive levels of the asthma drug salbutamol and he could yet be stripped of that title if he is found to have committed an anti-doping violation.

Related: Chris Froome fights to save career after failed drugs test result

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