Ukraine's Anastasiya Mokhnyuk is the latest athlete to test positive for meldonium ©Getty Images

Ukrainian penathlete Anastasiya Mokhnyuk, the silver medallist at the International Association of Athletics Federations (IAAF) World Indoor Championships last month, has tested positive for meldonium.

She may, however, still be able to keep her medal following the announcement by the World Anti-Doping Agency (WADA) yesterday that that positive drugs cases involving meldonium are to be investigated.

According to a statement on the Ukrainian Athletics Federation website, the 25-year-old tested positive for the substance – only added to the WADA prohibited list from January 1 of this year – after finishing second behind Canada’s Brianne Theisen-Eaton at the event in Portland.

In the statement, Mokhnyuk is quoted as saying she had been taking the drug for medical purposes before it was added to the banned list.

A total of 172 failures have been reported so far but some athletes could feasibly not face the toughest sanctions and instead receive "negligence" or "no fault" rulings.

In some cases, they could be handed no punishment and be able to resume their careers.

WADA admitted yesterday that "limited data exists to date" on the urinary excretion of the drug, while the renal elimination of meldonium is expected to "vary significantly between individuals, depending on the dosing and duration of the drug administration protocol".

WADA has ruled that if below one microgram of the substance was detected in a test before March 1 a no fault or negligence verdict could be reached.

The ruling, therefore, will give hope to many who are currently provisionally suspended ahead of the Olympic Games in Rio de Janeiro in August, including Mokhnyuk. 

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Anastasiya Mokhnyuk, left, may retain the silver medal she won at the IAAF World Indoor Championships, despite testing positive for meldonium ©Getty Images

Mokhnyuk is the second medallist from Portland to have tested positive for meldonium.

Romania’s 4x400 metres relay bronze medallist Mirela Lavric also failed a test for the drug at the Championships.

If she Mokhnyuk is stripped of her silver medal, her team-mate Alina Fyodorova will be promoted to second place and the United States' Kendell Williams to bronze. 

Mokhnyuk had gone into the final discipline of the five-event penathlon leading but an outstanding 800m from Theisen-Eaton saw her move from third to first. 

Mokhnyuk is the fourth athlete from Ukraine known to have tested positive for meldonium.

She joins Nataliia Lupu, the 2013 European Indoor 800m champion, whose positive test for the drug meant she was unable to compete in Portland. 

The other Ukrainians to have tested positive are Olga Abramova and Artem Tyshchenko, both suspended by the International Biathlon Union (IBU).

The IBU announced last week that they were delaying hearings into the cases of Abramova and Tyshchenko because of doubts over how accurate the science was in testing for meldonium.