The possible imminent birth of the first cub in Scotland is being closely monitored by specialist vets, panda fans and conservationists across the world.
A leading panda maternity expert from China is on standby for the forthcoming announcement of a potential pregnancy - the creatures often have "phantom" pregnancies - is understood to be flying to Scotland.
However, such is the interest that the pool of international experts now involved in the Royal Zoological Society of Scotland's preparations and build-up is growing.
During the monitoring process RZSS employed new protein analysis techniques pioneered by Memphis Zoo, and also used by Washington Zoo, in the US.
As yet only used in a few female pandas around the world, the tests have been refined further by the Scottish team.
Although too early to be classed as a definitive and wholly reliable, the results pointed towards the hormone profile of a pregnant panda that would carry to full term.
Separate pioneering tests carried out at a zoo in Berlin have even indicated that Tian Tian, who was artificially inseminated, could be pregnant with twins.
A spokeswoman for the zoo said yesterday: "Tian Tian is doing really, really well.
"Yuang Guang is his usual self, eating bamboo.
"It has captured the attention of the whole of the world but they are such great ambassadors for conservation."
Any cubs would stay in Scotland for two years before being sent to China.