CNN

WASHINGTON (CNN) - Rudy Giuliani's presidential campaign released a statement Wednesday from his personal physician giving him a clean bill of health.

"It is my medical opinion that Rudy Giuliani is in very good health," said Dr. Valentin Fuster of the Mount Sinai Medical Center, who described himself as the Republican presidential hopeful's personal physician for the past seven years.

The former New York City mayor was admitted to a hospital in St. Louis, Missouri, one week ago after he complained of a severe headache. Following an overnight stay, he cut back on his campaign schedule for the next few days.

Fuster said that Giuliani was given a CT-MRI of the brain, ultrasound of the carotid arteries, and a spinal fluid evaluation while he was in the hospital in St. Louis. The doctor also said that he had given the former mayor a transesophageal echocardiogram, a special test that uses sound waves to take pictures of the heart.

All of the tests were purely precautionary, and the results were all normal, according to Fuster. He added that the former New York City mayor was not prescribed any medication.

He added that Giuliani's PSA levels in a routine test given within the past month were negligible or undetectable, and routine laboratory tests were normal. High PSA levels could have been an indication of prostate cancer, which the former mayor suffered from several years ago.

CNN requested an interview with Fuster, but the Giuliani campaign declined and said that was all the doctor would have to say at this time.