Dologuele won 23.78 per cent of the vote in the first December 30 round, trailed by Touadera, who picked up 19.42 per cent, according to the results that still need to be officially confirmed by the Constitutional Court.
The National Election Authority (ANE) said turnout at the presidential and parliamentary elections reached a high 69 per cent.
Nearly two million people in the country of around five million were eligible to vote in the elections, seen as turning the page on three years of sectarian violence, the deadliest since the country won its independence from France half a century ago.
One of the world's poorest countries, Central African Republic descended into chaos in 2013 after former leader Francois Bozize was ousted by a mainly Muslim rebel alliance.
Thousands of people were killed and around one in 10 fled their homes in attacks by rogue rebels on remote villages and brutal reprisals by Christian vigilante groups against Muslim communities.