Ohuruogu confirmed her intention to appeal in September

The 400m Commonwealth Games champion, 22, was banned after missing three out-of-competition tests in 18 months.

That would rule her out of events until September 2007, but the CAS revealed in a statement that Ohuruogu "requests the annulment of the decision".

The CAS said appeal decisions were usually made within four months.

Under the rules of governing body the IAAF, athletes must notify drug-testing bodies of their whereabouts and be available for surprise, out-of-competition tests.

If what they're looking at is an Olympic ban, I don't see the point in me running again Christine Ohuruogu

UK Athletics ruled that Ohuruogu had contravened these rules, but added it was "a minor, unintentional infraction... due only to forgetfulness".

Ohuruogu has said that the point of her appeal is based firstly on her desire to race in future Olympic Games.

Under the current ban she would not be eligible for future Olympics, a ruling which Ohuruogu has labelled "completely out of line".

"If what they're looking at is an Olympic ban, I don't see the point in me running again," she said in September.

606 VIEW Ohuruogu's ban is a fair one and I don't think she will win an appeal Sid 606: Have your say

Part of Ohuruogu's defence is that she had been forced to change her training schedule while trying to overcome an injury to compete in the European Championships in August in Goteborg, Sweden.

She was ruled out of the meeting and provisionally suspended on 7 August because of the missed tests.