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03/09/10 6:56 PM ET

Tests on Reyes confirm overactive thyroid

Mets shortstop staying in New York to determine treatment

PORT ST. LUCIE, Fla. -- Jose Reyes has an overactive thyroid. The Mets said late Tuesday that tests administered in New York on Monday confirmed the original diagnosis. The club said little else except that Reyes is to remain in New York for additional blood tests, which will determine how he is treated. The results of those tests are not expected before Thursday.

No matter what is decided, the results of the third set of blood tests will delay Reyes' training camp at least one more day and perhaps longer. The best-case scenario the Mets had envisioned had him returning to camp Wednesday and playing by the weekend.

Reyes' only game activity thus far has been participating in the Mets' one intrasquad game on March 1. The club announced the need for additional tests Thursday. The doctors reading those tests Thursday cleared the shortstop to play in an exhibition game Friday. But, the club said, the Mets doctors in New York preferred to be conservative in their approach. Reyes was scratched from the lineup Friday.

He was under orders not to strain or put his body under stress before he traveled to New York on Saturday. Doctors didn't want him sweating.

Reyes said he felt fine Friday and that he had experienced no symptoms. But he also expressed concern and disappointment.

"This is not what I want to be doing," he said Friday. "I am disappointed. ... I have to be concerned about it and find out what's going on. This is important. We're not talking about my leg. We're talking about my health, so I have to be concerned about it. It can be dangerous for me."

Webmd.com characterizes hyperthyroidism in this way: It "means your thyroid makes too much thyroid hormone. Your thyroid is a gland in the front of your neck. It controls your metabolism, which is how your body turns food into energy. It also affects your heart, muscles, bones and cholesterol.

"Having too much thyroid hormone can make a lot of things in your body speed up. You may lose weight quickly, have a fast heartbeat, sweat a lot or feel nervous and moody. Or you may have no symptoms at all. Your doctor may discover that you have hyperthyroidism while doing a test for another reason.

"Hyperthyroidism is easily treated. With treatment, you can lead a healthy life. Without treatment, hyperthyroidism can lead to serious heart problems, bone problems and a dangerous condition called thyroid storm."

"I don't feel any different. I feel good," Reyes said. "This is the first time for me. The results have always been the same. This time, it was high. I have to be worried -- I can't do anything until next week."

Reyes missed most of last season and had surgery on his right leg in October. He hasn't been restricted in any way by his leg this spring. He tripled in his first at-bat in the intrasquad game and had no trouble running.

Marty Noble is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.