Dysfunctional Hemoglobin Pulse Oximetry

Inclusion Criteria: * The subject is male or female. * The subject is of any racial or ethnic group. * The subject is between 18 years and 50 years of age (self-reported). * The subject does not have significant medical problems (self-reported). * The subject is willing to provide written informed consent and is willing and able to comply with study procedures. * Exclusion Criteria: * Has a BMI greater than 30.0 (calculated from self-reported weight and height). * Has had any relevant injury at the sensor location site (self-reported). * Has a deformity or abnormalities that may prevent proper application of the device under test (based on visual inspection). * Has a known respiratory condition (self-reported). * Is currently a smoker (self-reported). * Has a known heart or cardiovascular condition (self-reported). * Is currently pregnant (positive serum pregnancy test at screening visit or positive urine POC test on day of study). * Is female and actively trying to get pregnant (self-reported). * Has a clotting disorder (self-reported). * Has Raynaud's Disease (self-reported). * Is known to have anemia (hemoglobin value below lower range of normal for gender) * Is known to have a hemoglobinopathy such as sickle-cell anemia or thalassemia (abnormal hemoglobin electrophoresis). * Is known to have a inherited or congenital methemoglobinemia (self-reported). * Has unacceptable collateral circulation from the ulnar artery (based on exam). * Is unwilling or unable to provide written informed consent to participate in the study. * Has another health condition which in the opinion of the principal investigator makes him/her unsuitable for testing.