Lindsey Vonn was injured in a training crash at Copper Mountain ahead of her return to racing following major knee surgery.
Vonn, 29, was taken off the slope on a sled and driven to nearby Vail, Colorado, for medical examinations.
"She is being evaluated to determine if there are any injuries, as is standard procedure," US Ski Team spokesman Tom Kelly told BBC Sport.
"We'll have a report once we know more."
The American was not admitted to hospital but went home to Vail to be evaluated by the doctor who performed her recent knee surgery.
Vonn started training in September after being out for seven months with ruptured ligaments following a crash at the World Alpine Skiing Championships in Schladming, Austria.
Re-injuring her right knee might be the end of her bid to defend her Olympic crown in February at Sochi.
Vonn's friend and team-mate Julia Mancuso tweeted: "Let's all send Lindsey Vonn our positivity and hope for the best."
The four-time overall World Cup champion had hoped to compete next week at Beaver Creek in a World Cup event.
Vonn is dating 14-time major golf champion Tiger Woods.