Ursula Arens from the British Dietetic Association told BBC Radio 4's Today programme that putting fresh meat through a mincer did not make it processed meat.
The FSA-supervised testing programme is being conducted by local councils following the earlier recalls of supermarket and caterer meat products containing horsemeat.
"There are plants and companies in Romania exporting horsemeat but everything was according to the standards, and the source and the kind of meat was very clearly put as being horsemeat, " Romanian Prime Minister Victor Ponta told the BBC's Newsnight programme.