The primary objective of this clinical investigation is to evaluate the repeatability and reproducibility of using Rad-67 Pulse CO-Oximeter

Inclusion Criteria:

• At least 18 years of age
• Weight at least 110 pounds
• Subjects with the intention of being screened for eligibility to donate blood
• The subject has given written informed consent to participate in the study

Exclusion Criteria:

• Subjects with skin abnormalities at the planned application sites that may interfere with sensor application, per directions-for-use (DFU) or trans-illumination of the site, such as burns, scar tissue, infections, abnormalities, etc.
• Subjects unwilling to remove nail polish or acrylic nails
• Subjects with blood cancers such as leukemia
• Subjects with hemoglobin disorders such as sickle-cell anemia and thalassemia or with known history of infectious diseases such as HIV/AIDS, syphilis, hepatitis, etc.
• Subjects with self-disclosed/known pregnancy at the time of enrollment
• Subjects deemed not suitable for the study at the discretion of the investigator
• Subjects unlikely to be able to refrain from excessive motion during data collection. Excessive motion includes postural changes, making hand gestures, involuntary muscular movements, etc.

1 hour