Nigeria-born Oluwakemi Adekoya has been provisionally been suspended by the Athletics Integrity Unit (AIU) for a failed drugs test.
According to Insidethegames website, the quartermiller was tested positive for banned steroid stanozolol and has been notified of the allegation as her case has a date of November 26 when listed on the AIU website.
The 25-year-old switched allegiance to the oil-rich nation in 2014 after having represented at junior levels.
In 2016 she won 400 metres gold at the World Indoor Championships in Portland in the United States.
Her record also includes four gold medals at the Asian Games, including the 400m hurdles title at last year’s edition in Jakarta and Palambang.
She also helped Bahrain to the mixed 4x400m relay title in Indonesia, four years after winning the 400m and 400m hurdles double at Incheon 2014.
In Bahrain, she set various national records since switching to the Gulf state.
The AIU was founded by the International Association of Athletics Federations (IAAF) in 2018.
Also, the AIU has announced that Kenya’s 2006 Commonwealth 10,000m champion Lucy Kabuu Wangui had been handed a two-year ban after testing positive for morphine.
Her ban runs from August 1, 2018, with her results from April 8, 2018, to August 1, 2018, to be disqualified, which includes her win at the Milan Marathon.