The German, who also competes in Formula E, recently attended the IndyCar season finale with former GP3 team-mate Conor Daly. Abt will test for the Indy 500-winning Andretti squad at Barber Motorsports Park later next month with a view to making the move Stateside.
And he says he began considering the series because buying a seat at the rear of the F1 grid is not worth it.
"It's an option in my mind, but before I can really make a decision I need to get a feeling for the sport," said Abt.
"Formula 1 was always my dream and that's why I always did GP3, GP2, Formula 3, whatever, but it's [Max] Verstappen at 16 taking those places [in F1] and I'm starting to think that maybe it's not what I want to do.
"You can always bring some money and drive a Caterham, but is it worth it just to be called an 'F1 driver'? I don't think so.
"I'm 21 now and I'm at a point where I need to look at what makes sense," added Abt.
The German is currently in his second season of GP2 and sits 13th in the standings with two rounds remaining. He finished third on the road in the inaugural Formula E race only to be disqualified for a technical infringement.