Crit-Scan enables an entirely non-invasive spot-check methodology to measure real-time transcutaneous hematocrit (anemia screening, etc.) and saturated oxygen, eliminating the need for an invasive, painful needle-stick of the finger. Additionally, the Crit-Line III TQA platform, which is widely used in the hemodialysis industry, offers a non-invasive method of optimizing patient dry weight, reducing anti-hypertensive meds, minimizing intra-dialytic morbidity, reducing hospitalizations, and increasing efficiency.