Systems and methods for measuring and tracking wound volume

A method of operating a negative pressure wound therapy apparatus comprising:

• periodically activating a negative pressure source to maintain negative pressure in a fluid flow path connecting the negative pressure source to a wound covered by a wound dressing between a low negative pressure setpoint and a high negative pressure setpoint, the high negative pressure setpoint being associated with higher level of negative pressure than the low negative pressure setpoint;
• determining a change in a volume of the wound based on a time duration between a first time at which the high negative pressure setpoint has been established and a second time at which the high negative pressure setpoint has been reestablished in the fluid flow path, the second time being subsequent to the first time;
• and
• providing indication of the change in the volume of the wound,
• wherein the method is performed by a controller of the negative pressure wound therapy apparatus.