Re: Hidden blood loss and the influencing factors after laparoscopic cholecystectomy.

We totally agree with the authors that hidden blood loss (HBL) is not to be neglected in laparoscopic cholecystectomy (LC). In our humble opinion, the time of occurrence of the lowest value of haematocrit varies with operation, thus the time of the lowest value in LC operation needs further study. [Extracted from the article]