Insufficient blood volume means that the effective circulating blood volume is insufficient due to various reasons, and the patient will have a series of symptoms, such as manifestation of decreased blood pressure, pale lips, cold limbs, panic and chest tightness, and in severe cases, indifference to consciousness or even coma, etc. So to determine whether the blood volume is replenished, you can judge from the following aspects: First, if the patient’s limbs have a cold state and gradually become warm, it means that the blood volume begins to replenish. At the same time, the patient’s blood pressure gradually rises from a low blood pressure state, while the pulse pressure difference gradually increases, which also indicates that the blood volume is gradually replenished. In addition, when the heart is auscultated, if the heart rate gradually returns to normal from the heart rate very quickly, it also indicates that the blood volume is gradually replenished. Thirdly, the patient’s urine volume increases from no urine or little urine; finally, the patient’s facial color can be judged.