1. Of or relating to an upright standing position.
2. Concerning or caused by an erect position.

The appearance of albumin (main protein in human blood) in the urine when the patient is erect and its disappearance when recumbent (lying down).

A fall of blood pressure which occurs when the erect position is assumed.

Purpura (a condition in which bleeding under the skin causes purplish blotches to appear on the skin) which develops in the lower extremities after prolonged standing.

Syncope (spontaneous loss of consciousness caused by insufficient blood to the brain) when assuming the standing position.