Cell rate
Cell rate displayed on a monitor
The cell rate was a form of biometric data pertaining to a lifeform.
In 2153, the cell rate of a Borg drone was among the biometric data collected by a team of researchers and submitted to Starfleet Command. (ENT: "Regeneration")
Body function panels in Constitution-class starship sickbays also measured cell rate. (Star Trek: The Original Series)