If there's no heart beat . . . you're dead . . . . . a dead human being.
If there IS a heart beat, you're alive, a live human being.
Change my mind
Are you talking about detecting the heartbeat of the unborn baby?
Christianity is the only religion that claims that as soon as conception (the egg being fertilized, no heartbeat) it is a human being with a spirit.
Various other faiths (Muslim, Hindu, etc.) have the human spirit entering at various other times (3 weeks after conception, etc.).
A baby is alive and growing before the heart is formed and starts beating.