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The test, which involved a pinprick and took about a minute, was performed at Guy’s and St. Thomas’ Hospital in London. The 31-year-old prince tested negative for HIV.
Harry, who admitted to some nerves, said he took the test "to show how easy it is to get tested."
He added, "It's amazing how quick it is."
Prince Harry has been tested for HIV @GSTTnhs
It's a simple finger prick test and gives a nearly instant result! pic.twitter.com/VRr6KyUSD3— Kensington Palace (@KensingtonRoyal) July 14, 2016
Harry, a patron of the charity Sentebale, which raises awareness for HIV/AIDS, has pledged to increase the conversation around the once-taboo disease. Harry co-founded Sentebale ("forget me not" in Sesotho) in memory of his mother, Princess Diana.
Diana famously championed AIDS awareness in her life and was one of the first major figures to work to destigmatize AIDS and HIV.
Kensington Palace announced last month that Harry would be devoting a significant amount of his charitable work to HIV awareness to carry on his mother's legacy.
He told viewers watching the Facebook live broadcast, "Gay, straight, black, white, ginger, whatever — why wouldn’t you just have a test?"
"We all shouldn’t be on the other side of the river saying, 'You should get the test,'" he said. "It should be normalized. Everybody should get it."
Harry, fifth in line to the British throne, will attend the International AIDS Conference in Durban, South Africa, next week. He is scheduled to speak alongside Elton John and Sentebale's other co-founder, Prince Seeiso of Lesotho, at the event.