It was during testing at a camp in Italy, requested by the International Athletics Federation World Athletics, that the elevated values were discovered on Mboma and her almost equally successful compatriot Beatrice Masilingi, who made 49.53.
They have the levels naturally in the body and it is not added through doping.
They are called "Namibia's golden girls" in their home country and are number one and third on the world best list in the 400 meters after a sensational breakthrough in the spring.
"Looking forward to competing in the Olympics"
The double Olympic champion in the 800 meters, Caster Semenya, has been stopped on distances between 400 and 1609 meters and recently failed to qualify for the Olympics in the 5000 meters.
According to the coaches of the Namibian runners, they will now compete in the 200 meters in the Olympics where they are far behind the best and without a chance to take the medley.
- Although both Christine and Beatrice are disappointed that they can not participate in their favorite sport, they are in good spirits and look forward to competing for Namibia in the games, says coach Henk Botha to The Namibian.