What is long-COVID and how is it diagnosed?

Some people experience the impacts of COVID beyond the initial phase of illness. If symptoms persist beyond 12 weeks, a diagnosis of Long-COVID may apply.

NICE provisional guidance on long-COVID Overview | COVID-19 rapid guideline: managing the long-term effects of COVID-19 | Guidance | NICE

The long-COVID research project seeks to deepen the understanding of long-COVID and how it is diagnosed.

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My attempt at a simple definition for Long Covid:
‘Symptoms that continue to present for at least 12 weeks following an original Covid infection, and for which there is no other formal diagnosis’.
I think it’s important that the definition includes the fact that other possibilities for the relevant symptoms have been professionally eliminated.
A clear definition is essential to facilitate a clear diagnosis, but there is a great inconsistency with formal diagnosis and assumed LC.

Thank you for your post.
A new topic thread has been created to bring together a conversation about definitions - You can find it here: How should we define Long Covid?
This forum topic is closed to avoid confusion and people not seeing posts about the same topic.