月经后期·肾精亏虚证(delayed menstruation with syndrome of kidney essence insufficiency)是指肾虚精血亏少,冲任不足,血海不能按时满溢,以月经后期,量少而色暗,质清稀,腰膝酸软,夜尿多,舌淡,苔薄,脉沉细为常见症的月经后期证候。