Why would standing for 2 minutes give a different blood pressure than immediately after standing?

When a person stands up, there is an initial drop in blood pressure due to gravity causing blood to pool in the legs. Over the next couple of minutes, the body compensates through mechanisms like increased heart rate and vascular constriction, leading to a stabilization or even an increase in blood pressure. Thus, the difference in blood pressure readings between immediately after standing and after standing for two minutes reflects the body's adaptive responses to maintain blood flow to vital organs.