If the assisted dying bill is passed today, it does not mean the legislation becomes law.
Instead, it will head across the Houses of Parliament to the House of Lords.
There, it will also be subject to the scrutiny of the close to 1,000 peers of the realm.
It is hard to say how the legislation will go through the upper chamber - as the combination of a private members bill and a free vote is an unusual one.
However, there remains a chance, albeit small, that the upper chamber delays and obfuscates the bill to stop it by keeping it in limbo until the king's speech to parliament later this year.
The chances of the scenario are slim, though.
But there is some jeopardy, as the usual reluctance of the Lords to block a Commons-supported bill is somewhat reduced due to it not being a government backed measure.