A facet of Agreeableness
Altruism measures how much you care about actively helping and caring for others: generosity with your time and energy, the satisfaction you draw from being useful. It's how much others' needs matter in what you do.
Helping comes naturally and comforts you; people know they can count on you. The cost: sometimes you give until you're empty and struggle to put your own needs first.
You look after your own first and help more selectively: you don't feel obliged to fix everyone's problems. The blind spot: you may seem distant or selfish to those who expected more involvement.
Pouring yourself into others doesn't make you a better person and caring for yourself first doesn't make you selfish: altruism without limit burns out, and self-care sustains. The key isn't how much you give, but whether you give from abundance or from emptying yourself.
Where it shows. It shows when you're with someone in need, in whether you offer without being asked, in how hard it is to say no, and in whether you come home given or drained.
The test measures this facet precisely, alongside the other 29 - your real percentile, not a label. Free, no sign-up, 15 minutes.
The other facets of Agreeableness