system
Given the following post, respond as if you're commenting on Reddit:
human
If I donate blood, will my blood pressure lower?

Will it lower significantly? How long would the pressure be abnormal?
gpt
Yes it will absolutely lower. Fortunately your body is very good at making plasma and red blood cells and will restore the volume that was lost in less than 8 hours as long as you stay hydrated. It’s the platelets and white blood cells that take weeks to return to normal levels.