I was nervous. My trip to the Tropical Medical Bureau (TMB) was the most exotic one I'd taken in 10 weeks.
I had my supermarket and exercise routines down, but visiting a clinic for an €80 antibody test? With Covid-19 screening measures likely to dominate future travel, however, I felt it was worth stepping out of my comfort zone.
Arriving at the clinic, I was asked to use hand sanitiser and don a free face mask. In a consultation, Dr Graham Fry outlined the procedure.
While PCR swab tests tell if you currently have the disease, antibody tests check blood for specific Covid-19 antibodies that may be present if you had it in the past.
There are different tests, types of antibodies and lots of debate to read up on, but a positive result from TMB's lab-based test is over 98pc accurate, Dr Fry says. "So you can trust it".
A negative result is 95pc accurate, he adds - a high figure, but clearly not ruling out previous infection. Results are available within 48 hours (home testing kits will be available in the future, too - though will involve drawing 20-30 drops of blood).
Back in March, I had a persistent cough and chest pressure, but not enough symptoms for a Covid-19 test. People like me are starting to show interest in antibody tests, Dr Fry says, and he also sees potential for business and travel, with two crucial qualifiers - we don't yet know if antibodies confer immunity, or how long they will last.
"The chances are you are protected," he ventures. "But we don't know at this stage." We are "still learning" about Covid-19, he adds; it could take months to find out.
As countries open and airlines take off, however, debates on testing, quarantine and digital health passports are raging. All arrivals at Hong Kong Airport must now take tests, for example, while Iceland plans to offer visitors the choice of a test or a 14-day quarantine from June 15.
Discovering you have Covid-19 at an airport is plainly not ideal, and while infrared checks set a tone and have their uses, Dr Fry says people can have high temperatures for various reasons, and paracetamol and cold packs can influence readings.
If antibodies are shown to be protective, that raises fascinating and scary questions.
Could travellers or citizens with immunity move freely - on planes, in workplaces, hotels or bars - while others cannot, or face discrimination?
The mind boggles.
Clearly, we are speculating at this point, but if antibodies do make us immune to Covid-19, does Dr Fry think they will be part of future travel?
"Until we have a vaccine," he says.
My blood test was straightforward - sore but short. After our chat, given that I am healthy now, I felt like a positive would be the best outcome. After 48 hours, I logged on.
The result was negative.
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