US President Donald Trump is in “exceptional health," his physician said after he underwent a checkup that included lab tests and preventive health assessments at Walter Reed National Military Medical Center.

Trump spent roughly three hours at the Bethesda, Maryland, hospital on Friday for what his doctor, Navy Capt Sean Barbabella, called a “scheduled follow-up evaluation" that was a “part of his ongoing health maintenance plan.” While there, Trump also got his yearly flu shot, as well as a Covid-19 booster vaccine.

“President Donald J Trump remains in exceptional health, exhibiting strong cardiovascular, pulmonary, neurological and physical performance,” Barbabella wrote in a one-page memo released on Friday night by the White House. The doctor noted in the memo that the evaluation helped prepare for Trump's upcoming overseas trips and included advanced imaging, lab testing and preventive health assessments.

The president is travelling to the Middle East this weekend and is scheduled to fly to Asia at the end of this month.

Barbabella also said he evaluated Trump's cardiac age, which was about 14 years younger than his chronological age. Trump is 79 and was the oldest US president at his inauguration.

The White House this week initially described Trump's Walter Reed visit as a “routine yearly checkup,” although Trump had his annual physical in April. The president then called it a “semiannual physical."

Trump's April physical found that he was “fully fit” to serve as commander in chief. The three-page summary of the exam done by Barbabella then said Trump had lost nine kilogrammes since a medical exam in June 2020 and has an “active lifestyle” that “continues to contribute significantly” to his well-being.

In July, the White House announced that Trump had recently undergone a medical checkup after noticing “mild swelling” in his lower legs and was found to have a condition common in older adults that causes blood to pool in his veins. Tests by the White House medical unit showed that Trump has chronic venous insufficiency, which occurs when little valves inside the veins that normally help move blood against gravity gradually lose the ability to work properly.

At the April physical, Trump also passed a short screening test to assess different brain functions.

Presidents have large discretion over what health information they choose to release to the public. Trump’s summary from his April exam included information about his weight, body mass index, past surgeries, mental health screenings, cholesterol levels and blood pressure.

When spokeswoman Karoline Leavitt discussed the results of his chronic venous insufficiency diagnosis from the briefing room, she noted that the White House was disclosing details of the checkup to dispel rumours about Trump’s health. At the time, Trump was frequently observed with bruising on his hand.

The Republican president has also repeatedly used the issue of health as a political cudgel. He repeatedly questioned the mental and physical health of his Democratic predecessor, President Joe Biden, and pointed out that he has undergone cognitive testing that Biden hadn’t.

Biden has brushed aside those criticisms and said he was fit to serve, but he dropped out of the 2024 race for the White House after a disastrous debate with Trump raised doubts about his fitness for office. (AP)