CAS reduced Rhonex Kipruto's suspension, Patricia Álvarez banned for two years for doping
The Court of Arbitration for Sport in Lausanne partially upheld the appeal of Kenyan long-distance runner Rhonex Kipruto and reduced his ban for violating anti-doping rules from six to five years. This was a case of major significance in athletics because it concerns a runner who was the world record holder in the 10 kilometres road race and a bronze medallist in the 10,000 metres at the World Championships. According to the announcement by the Court of Arbitration for Sport, the CAS panel confirmed that Kipruto had committed an anti-doping rule violation, but found that the additional extension of the sanction due to aggravating circumstances should amount to one year, not two years.
The decision means that the fundamental finding of blood manipulation is not being called into question, but solely the duration of the sanction. CAS stated that Kipruto's biological profile was the result of blood manipulation and that the medical explanations offered by the athlete did not meet the necessary diagnostic requirements. The Kenyan argued in the proceedings that he had not committed a violation and sought the annulment of the decision of the World Athletics Disciplinary Tribunal, but the arbitration panel did not accept that part of the appeal. The sanction is calculated taking into account the period of provisional suspension imposed on him from 11 May 2023.
In a separate case, Spanish athlete Patricia Álvarez Pérez received a two-year ban after proceedings in which the presence and use of furosemide were established. According to the decision published in the Athletics Integrity system, the suspension is linked to an anti-doping rule violation, and furosemide is included in the group of diuretics and masking agents on the World Anti-Doping Agency's Prohibited List. Spanish media report that her results from 29 March 2024 are being annulled, including performances achieved in the period before the final sanction was imposed.
Kipruto remains banned, but for one year less
According to the CAS statement of 16 April 2026, Rhonex Kipruto appealed against the decision of the Disciplinary Tribunal of the Athletics Integrity Unit, the body operating within the World Athletics system. The Disciplinary Tribunal had previously imposed on him a six-year ban after concluding that irregularities in his athlete biological passport resulted from doping. After the appeal proceedings, CAS confirmed the existence of the violation, but concluded that the sanction regarding aggravating circumstances should have been more lenient.
The original sanction consisted of a four-year ban for an intentional anti-doping rule violation and an additional two years due to aggravating circumstances. World Athletics argued that the aggravating circumstances were connected with multiple instances of blood doping and with the allegation that the athlete had participated in a deliberate and sophisticated doping regime. CAS accepted that aggravating circumstances existed, but referred to the principle of proportionality and reduced the additional period of ineligibility to 12 months. This brought the total sanction down to a five-year ban.
The published arbitral award states that Kipruto's results achieved from 2 September 2018 to 11 May 2023 are annulled. This also includes the consequences arising from such disqualification, such as the loss of titles, medals, points, prizes and monetary amounts connected with performances during that period. The World Athletics Disciplinary Tribunal had already covered the same period in its decision, and CAS confirmed that part. For the athlete, this means that the reduction of the sanction does not change the sporting consequences connected with the results from the disputed period.
Kipruto is one of the better-known athletes sanctioned on the basis of the biological passport. The athlete biological passport does not rely only on one positive finding, but monitors selected biological parameters over a longer period. If experts establish a pattern that cannot reasonably be explained by physiological, medical or other permitted reasons, such data can serve as the basis for doping proceedings. In this case, according to the AIU and CAS, expert findings pointed to blood manipulation.
The biological passport was the central evidence
The Athletics Integrity Unit announced back in June 2024 that Kipruto had been sanctioned after the Disciplinary Tribunal concluded that the irregularities in his biological passport were the result of doping. According to the AIU's statement at the time, blood samples collected in the period from July 2018 to March 2022 were analysed, and several experts reviewed the passport together with his competition schedule. The AIU stated that the experts unanimously assessed that doping was highly likely on the basis of abnormal haematological patterns.
In his defence, Kipruto argued that the deviations could have been the consequence of natural and specific characteristics of his body, various medical conditions and health circumstances. The Disciplinary Tribunal rejected such a defence, and CAS again considered the scientific evidence and expert opinions in the appeal proceedings. According to the CAS reasoning, the panel concluded that the medical explanation offered had not been proven to the required standard. The court therefore confirmed that this was a rule violation relating to the use or attempted use of a prohibited substance or prohibited method.
This part of the decision is important because it shows how forensic analysis of long-term biological data is increasingly being applied in modern anti-doping proceedings. In blood doping, the objective may be to increase oxygen transport capacity and endurance, which is particularly relevant in long-distance disciplines. Such methods are often harder to prove through a direct finding of a single substance, so the biological passport serves as a tool for identifying patterns that deviate from expected values. CAS assessed in this case that the evidentiary material was sufficient to confirm the violation.
The one-year reduction of the sanction does not mean the athlete has been cleared or that the position that a rule violation occurred has changed. On the contrary, the arbitration panel expressly confirmed that the violation had been proven and that it was an intentional form of doping. The difference compared with the first-instance decision concerns the assessment of how much the aggravating circumstances should increase the basic four-year ban. In practice, Kipruto remains subject to a multi-year ban, and his sporting career and results from the period to which the decision relates remain seriously affected.
Patricia Álvarez case linked to furosemide
Patricia Álvarez Pérez, a Spanish runner who competed in road running and longer-distance races, has been punished with a two-year ban for violating anti-doping rules. According to the disciplinary body's decision published in Athletics Integrity documentation, the case concerns the presence and use of furosemide. Mundo Deportivo states that the sanction began to run on 14 July 2025 and lasts until July 2027, with the annulment of results from 29 March 2024.
Furosemide is a diuretic, and in the anti-doping context it is especially important because it can act as a masking agent. According to the World Anti-Doping Agency's 2026 Prohibited List, diuretics and masking agents are prohibited in sport at all times, except in cases covered by therapeutic use exemption rules. Such substances do not have to improve performance directly in the same way as stimulants or anabolic steroids, but they can affect the testing procedure and make it harder to detect other prohibited substances.
In the Spanish case, the key consequence is not only the two-year ban, but also the annulment of results. This may include the loss of placings, prizes and official results in races held after the date from which the disqualification applies. According to the available information, among the results covered by the annulment is a third place at the Azkoitia-Azpeitia half marathon. Such decisions show that anti-doping rules do not affect only professional stars of international athletics, but also athletes from less exposed competitive circles if they compete in events under World Athletics rules.
Unlike Kipruto's case, Patricia Álvarez's case is not focused on the biological passport and long-term patterns of blood parameters, but on a prohibited substance. Nevertheless, both cases show the breadth of the anti-doping system in athletics. One concerns a complex analysis of haematological values and allegations of blood manipulation, while the other concerns a substance that, under international rules, is classified as a diuretic and masking agent. In both cases, the consequences include a competition ban and annulment of results.
Why the decisions matter for athletics
Athletics has been under strong pressure in recent years to systematically enforce anti-doping rules, particularly in endurance disciplines in which small physiological advantages can have a major impact on results. World Athletics and the Athletics Integrity Unit stress that the biological passport, targeted testing and international data exchange are key tools in detecting more complex cases. The proceedings against Kipruto attracted additional attention because he is an athlete with top-level results and an international reputation. When sanctions concern athletes of such a profile, the consequences are not limited only to an individual career, but also affect trust in results, records and the competition system.
CAS has the role in the sporting system of the most important arbitration body for disputes arising from decisions of international federations and anti-doping proceedings. According to the court's own description, it is an independent institution for resolving sports disputes, established in 1984. Its decisions in cases such as Kipruto's are important because they determine how rules on evidence, proportionality of sanction and consequences for achieved results are applied. In this case, CAS sent a dual message: it confirmed the evidentiary significance of the biological passport, but at the same time corrected the duration of the additional sanction.
For athletes, coaches and competition organisers, both decisions also have a preventive dimension. The first is a reminder that long-term biological data can lead to a sanction even without a classic publicly highlighted positive finding for a single substance. The second confirms that substances which may sometimes be perceived as auxiliary or medical products carry a serious anti-doping risk if they are not covered by rules and documentation on permitted use. The system does not substantially distinguish the fame of athletes once a rule violation has been established: the consequences may include both elite runners and lesser-known competitors.
As of 25 May 2026, the available documents show that Kipruto remains under a five-year ban, with results annulled from September 2018 to May 2023, while Patricia Álvarez has a two-year suspension connected with furosemide and annulment of results from March 2024. Both cases continue the broader discussion about the effectiveness of anti-doping monitoring, but also about the need for athletes to understand precisely the rules relating to medicines, therapeutic exemptions, biological parameters and responsibility for everything found in their body or established in their data.
Sources:
- Court of Arbitration for Sport – statement on the partial upholding of Rhonex Kipruto's appeal and reduction of the sanction to five years (link)
- Court of Arbitration for Sport – published arbitral award in case CAS 2024/A/10704 Rhonex Kipruto v. World Athletics (link)
- Athletics Integrity Unit – statement on the original six-year ban for Rhonex Kipruto due to biological passport irregularities (link)
- Athletics Integrity Unit – decision in the case World Athletics against Patricia Álvarez Pérez (link)
- Mundo Deportivo – report on Patricia Álvarez's two-year suspension and annulment of results from 29 March 2024 (link)
- World Anti-Doping Agency – 2026 Prohibited List, including diuretics and masking agents (link)