This study will collect physiological measurements in healthy adult volunteers under controlled hypoxia and hemodilution conditions.

Subjects will undergo stepwise reductions in oxygen saturation and hemoglobin concentration while noninvasive monitoring data are recorded and compared with reference blood measurements.

Inclusion Criteria:

1. In good general health with no evidence of significant medical problems.
2. Fluent in both written and spoken English.

4. Has provided written informed consent and is willing to comply with study procedures.

Exclusion Criteria:

1. BMI above 30.
2. History of heart, lung, kidney, or liver disease.
3. Diagnosis of asthma, sleep apnea, or use of CPAP.
4. Diabetes mellitus.
5. Clotting disorders.
6. Hemoglobinopathy or history of anemia (ctHb <12 g/dL for men, <11 g/dL for women, COHb >2%).
7. Any serious systemic illness.
8. Current smoker.
9. Injury or abnormality at sensor sites interfering with measurements.
10. History of fainting or vasovagal response.
11. Sensitivity to local anesthesia.
12. Diagnosis of Raynaud's disease.
13. Unacceptable collateral circulation (Allen's test).
14. Pregnant, lactating, or attempting to become pregnant.
15. Unable or unwilling to provide informed consent or comply with study procedures.
16. Any other condition deemed unsuitable by the investigator.

Healthy adult volunteers. At least 7 subjects will be enrolled. Subjects will be selected with reference to ISO and FDA requirements to ensure appropriate representation across skin tone categories (Monk Skin Tone scale) and sex.

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