Stock index futures briefly turned negative on Tuesday, with energy shares in focus as oil prices dropped after Kuwait's oil minister said OPEC was considering boosting production for the first time in more than two years.

S&P 500 futures rose 1.5 points and were slightly above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures lost 6 points and Nasdaq 100 futures shed 3.25 points.