Percent Change from Nadir in Product of Perpendicular Diameters

**Semantic type:** Diagnostic Procedure

**Definition:** The current area minus the lowest area previously recorded, divided by the lowest area previously recorded, multiplied by 100.

**Synonyms:** - PCNPPD - Percent Change Nadir in PPD - Percent Change Nadir in PPD - Percent Change from Nadir in PPD