(NEXSTAR) – SpaceX is gearing up for the highly anticipated Dragon capsule launch on Saturday, but the shuttle company’s founder may be grounded at home if positive rapid coronavirus tests are confirmed.

Elon Musk, also known as the creator of the Tesla electric car line, says he took four tests for coronavirus after having cold-like symptoms. The results provided more confusion than clarity.

“Something extremely bogus is going on. Was tested for covid four times today. Two tests came back negative, two came back positive. Same machine, same test, same nurse,” Musk tweeted to his nearly 40 million followers.

Experts have cautioned that such rapid tests are less reliable than than longer turnaround PCR tests.

When asked by a follower about his whether he felt symptoms, Musk replied, “Symptoms of a typical cold. Nothing unusual so far.”

Musk tweeted late Thursday that he was waiting on PCR testing from separate labs that should be returned in “about 24 hours.”

Becton, Dickinson and Co. (BD), the maker of the rapid test that Musk took, responded through Twitter to say it is aware of his tweet about his coronavirus test results and is “reaching out to learn more, consistent with our quality management process.”

“While the scientific community agrees that no diagnostic test is perfect, we stand behind the quality, utility and science of our system and assay,” BD said.

Critics have pointed out that Musk downplayed the virus threat in the early days, predicting last March that country would have close to zero cases by April of 2020. He also spoke out against lockdowns that slowed production at his Tesla facilities.

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