Hong Kong Marathon
Karlshøj has won 37 Danish championships at various distances. She has set three Danish records at 1000 m, 1500m and 2000 meters, and set the 2002 world record for Masters (W40) at the half marathon distance. Her personal record for the marathon is 2:31:31, just 1.53min from Dorthe Rasmussen's Danish record of 2:29:34. At almost 45 years of age, Gitte Karlshøj won the open division of the Hong Kong Marathon in 2004. She won the masters division of the Boston Marathon two years in a row. She won all distances from 800m to marathon at the European Veterans Championships in 2004, all within a week. She was the 2009 world champion at 5.000 mi class-W50. She won the Danish championship marathon in 2009, which was hosted by the Hans Christian Andersen Marathon in Odense and thus became the oldest Danish champion ever. Her finishing time was 2:51,30.