The correct reading じんぞう uses standard On'yomi for 腎 (ジン) and 臓 (ゾウ). じんぞ, じんぞお, じんぞー are mispronunciations or incomplete readings. 腎臓 is the Japanese term for the kidney, an organ that filters waste products from the blood and helps maintain fluid and electrolyte balance.

「じんぞう」は、腎の音読み「ジン」と臓の音読み「ゾウ」です。「じんぞ」「じんぞお」「じんぞー」は不正確な読み方です。血液をろ過し、老廃物を排出する役割を持つ臓器「腎臓」を指します。