Repeatability and Reproducibility of Oxygen Reserve Index (ORi)

Inclusion Criteria: * Subject is 18 to 50 years of age. * Subject weighs a minimum of 110 lbs. * Hemoglobin value ≥ 11 g/dL. * Baseline heart rate ≥ 45 bpm and ≤ 85 bpm. * Blood Pressure: Systolic BP ≤ 140 mmHg and ≥ 90 mmHg, Diastolic BP ≤ 90 mmHg and ≥ 50 mmHg, and if systolic BP is lower than 100 mmHg and/or diastolic BP is lower than 60 mmHg, subject passes an orthostatic blood pressure test. * CO value ≤ 3.0% FCOHb. * Subject is able to read and communicate in English and understands the study and the risks involved Exclusion Criteria: * Subject has a positive hCG test. * Subject has a BMI \> 35. * Subject has a history of fainting (vasovagal syncope), blacking out or losing consciousness during or after a blood draw, or has a fear of blood draws. * Subject has open wounds, inflamed tattoos or piercings, and/or has any visible healing wounds that a medical professional determines may place them at an increased risk for participation. \* * Subject has known drug or alcohol abuse. * Subject uses recreational drugs. \* * Subject experiences frequent or severe headaches and/or migraine headaches, migraine auras, altitude sickness, and/or headaches accompanied by visual changes or sensitivity to light or sound. * Subject has experienced a concussion or head injury with loss of consciousness within the past 12 months. * Subject has any history of a stroke, myocardial infarction (heart attack), and/or seizures. * Subject has any chronic bleeding disorder (e.g., hemophilia). …