And the results came back negative.
"We looked at it just to see," Rivers said. "But it's good. All is good."
Chargers head coach Mike McCoy echoed those comments, stating the plan was for Rivers to play just the first half. Rivers not playing in the second half had nothing to do with his injured hand.
"That was the plan all along," McCoy said. "We said he was going to play maybe a half, and that was the plan coming that they weren't going to play."
On second-and-8 from Seattle's 10-yard line, Rivers failed to connect on a pass to receiver Stevie Johnson. Rivers' throwing hand hit Seattle linebacker Kevin Pierre-Louis' hand on the follow through, and he winced in pain.
Rivers finished the series, but headed to the locker room with a trainer just before halftime. Rivers was under pressure most of the first half, getting sacked twice and hit four times.
Rivers finished the half 13-of-19 for 140 yards. He posted an 89.8 passer rating.
"I'm good, "Rivers said. "Had this been the regular season, I would have still been rolling. That was it for me anyway, just that first half."