An allowable blood loss calculator suitable for immediate convenient access. The ABL Calculator uses the information you submit to determine your patients allowable blood loss for his/her lowest HCT (Hematocrit). Our product is useful for wide range of medical practitioners including, but not limited to anesthesiologists, surgeons, trauma surgeons, physician assistants, nurse practitioners, residents and medical students. Whether used in the clinical setting or for educational purposes the intent of the ABL Calculator is to provide a fast calculation tool, rather than any form of guideline and is not a substitute for clinical judgment.