I don’t know what other places use, but for very end of life we use what is called a [Palliative Performance Scale](https://www.mypcnow.org/fast-fact/the-palliative-performance-scale-pps/).
It rates the current condition of the patient with past indicators of how long people in similar situations have lived.
Obviously people can float up and down the scale depending on the day and their condition but it lets us track how they are doing in their final days and when to decide to contact family.
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