Hypothetically speaking, if your death would save the life of one or more complete strangers that you know nothing about, how many people would need to be saved (if any) in order for you to give up your own life?
EDIT: Your death would be painless and instantaneous.
If the people im saving will cumulatively live more than me then ill do it. Simple utilitarian calculus. If Time lost < time saved do it.
By that logic, you should be donating all your organs and every drop of blood right now.