LOS ANGELES -- What you look for are the vital signs, the hints and winks that say the mind and the spirit are getting the nourishment they need.

In this sense, these are the dead giveaways about the current state of the Boston Celtics:

Kyrie Irving isn’t bringing down the mood in the room anymore. Coach Brad Stevens doesn’t look like a confused coach. And the outside noise is quieter and so is the feeling of doom.

When the Celtics took the flight to California on March 4, they were thankful for the Los Angeles Lakers … or else they’d be Team Dysfunction. Seven days later, they’re returning home refreshed and frisky, almost as if they spent a week on the West Coast vacationing instead of working.

The Celtics dropped the rival Lakers in a Saturday showdown at Staples Center.

Don’t put too much weight in their 140-115 loss Monday to the LA Clippers. They were ambushed by the better-than-you-think Clippers and played without Jayson Tatum (who sat out with a sore right shoulder). Any coach or veteran player will tell you that winning the last game of a road trip might be the toughest task of an NBA schedule.

Well before last night’s buzzer sounded, the goal was already accomplished. The Celtics had righted and re-positioned themselves as one of four teams with a realistic shot at winning the East.

What we’ve learned about the Celtics is that they’re not the lost team of late February … and probably not completely free of problems either. Instead, the answer is simple: the season’s too long.

The Celtics seemed to turn the corner during their trip out West.

Over the course of 82 games, even contenders get face-palmed -- just ask the Warriors about their 10 home losses. Yet the one thing that remains constant through it all? You’re still a contender. And that’s what the Celtics were during the low moments and still are after this 3-1 road trip. The playoffs -- and nothing else -- will determine the truth.

“We’ve been all over the map,” Stevens said, “like a lot of teams.”

Yes, it got shaky there for a minute if you dwell about the small picture. The Celtics are 41-27 … does that sound or look like a problem?

“We were successful on this trip,” said Irving, who stopped brooding -- temporarily, anyway. “Now we go home to handle our business. We’ve got to keep it moving. Keep winning.”

Gordon Hayward says the Celtics are still working to build team chemistry.

The Celtics are being held, and holding themselves, to a high standard because of last season’s run to the Eastern Conference finals without Irving. This team, well coached and well-assembled, flourished minus a top-10 player. Simple mathematics say Celtics-plus-Irving equals heavyweight this season. Yet it hasn’t been so simple.

For a variety of reasons, the Celtics never managed to sit atop the East and, at times, appeared disjointed on the floor. For all his deserved applause as a young coach, Stevens looked surprisingly helpless while trying to develop cohesion, consistency and harmony. After a superb 2018 playoffs, Tatum hasn’t matched that level this season. And Gordon Hayward is still slow to return to Utah Jazz-era Hayward.

And so, the Celtics surrendered the attic in the East to the Milwaukee Bucks and slowly drifted downward. Not out of playoff position, but it felt that way.

The low point came in losing six of their eight games before this trip. They looked overmatched against the Bucks, Toronto Raptors, Houston Rockets and Portland Trail Blazers during that stretch. And didn’t the Celtics belong in that group? Chemistry was at risk and Irving handled the burden poorly within and beyond the locker room. A true leader uplifts his teammates, bravely faces questions and carries himself with great composure in tough times. Irving turned sour, seemed to deflect blame and mostly wanted nothing to do with the duties of leadership.