The Lur'kha was a ritualistic aspect of Klingon culture. Under its terms, a Klingon child who was old enough to carry a blade was considered an adult. As such, these children were sent into the night alone with their blade. Those that were destined to be warriors survive the trial.

Regent Worf in his childhood was undergoing the lur'kha at Khitomer when the Romulan's attacked. This spared him the death suffered by his family and he emerged from the trial just in time to see the Klingon Empire regain control of the planet. (DS9 novel: Dark Passions)

It's unknown whether this ritual has a counterpart in the standard universe.