There were no positive dope tests at this year's Tour de France, world cycling's governing body the UCI announced on Tuesday.
"All the samples collected were systematically analysed to detect stimulants and erythropoiesis," said the UCI, the latter being the process that produces red blood cells.
"Isotope-ratio mass spectrometry (IRMS) was also analysed in a certain number of samples, in particular to detect testosterone abuse and its precursors."
A total of 719 blood and urine samples were taken on this year's Tour, compared to 622 a year ago, with the testing carried out at a laboratory in France.
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