page_title: Doping at the World Athletics Championships
section_title: Disqualifications by nation
hierarchical_section_title: Doping at the World Athletics Championships / Disqualifications by nation
caption_attribution_description: Français&#160;: La médaille d'or et de bronze du 800m: Mariya Savinova et Ekaterina Poistogova Русский: Золотая и бронзовая медалистки Олимпийских игр в Лондоне в беге на 800 метров: Мария Савинова и Екатерина Поистогова
context_page_description: As a signatory to the World Anti-Doping Code, the International Association of Athletics Federations prohibits the use of banned performance-enhancing substances by competitors at the World Championships in Athletics. A list of WADA-banned substances is regularly published to the public and amended as scientific knowledge expands. The IAAF and anti-doping bodies undertake in-competition sampling of athletes blood and urine in order to detect where athletes have taken banned substances. This is also complemented by out-of-competition tests during the tournament and in the preceding period.
  Where a banned substance is detected in-competition the athlete's performance will be annulled and—depending on the severity of the infraction—the athlete may be banned from the sport for a set period. Where an out-of-competition sample tests positive for a banned substance, any performances by the athlete after that date may also be annulled. Athletes may also be banned via doping regulations if the athlete fails to submit to testing, tampers or interferes with the undertaking of anti-doping procedures, or is found in possession of banned substances.
context_section_description: This table collates the total number of athletes who have been disqualified for doping at the championships by nation. Athletes with multiple disqualifications are counted as one. Where a relay team is disqualified, this is counted as one disqualification, though multiple team members may have been sanctioned.
  Last updated 17 March 2018
  Russia's total for women's disqualifications and stripped medals includes the performances of Nailya Yulamanova, who helped Russia secure a bronze medal at the 2009 World Marathon Cup (held in conjunction with the 2009 World Championships marathon) but was later banned and had her team's performance annulled.
caption: Mariya Savinova is one of many Russian athletes to be stripped for World Championships medals.
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