What element increases after giving blood?

Reticulocytes are immature red blood cells. Red blood cells that haven't fully developed, yet. When our bodies lose a large amount of blood, we rapidly produce reticulocytes, so that our bodies can quickly replenish their red blood supplies. And obviously, when we donate blood, we lose blood.

White blood cells (recovery time: several weeks)

Red blood cells (recovery time: several weeks)

Platelets (recovery time: a few days)

Plasma (recovery time: several days)