To collect data on a variety of market approved Nellcor™ pulse oximetry sensors with the Nellcor™ Pulse Oximetry device to support the market approval.

The purpose of this study is to collect data on the Nellcor™ Pulse Oximetry device when paired with a variety of Nellcor™ Market Released sensors under invasive, controlled desaturation conditions, to verify Pulse Rate and SpO2 accuracy in a diverse participant population over a specified saturation range.

Inclusion Criteria:

1. Male or female participants ≥ 18 years of age, and < 51 years of age.
2. Participant is willing and able to comply with study procedures and duration.
3. Participant is willing to sign an ICF.
4. Participant weighs > 40kg (88.2 lb).
5. Participant is a non-smoker or has not smoked within 36 hours prior to the study.
6. Cleared same day health assessment form and health screening
7. Successful perfusion index ulnar/ulnar+radial ratio test (Assessed via the Allen's Test) showing adequate collateral blood flow.

Exclusion Criteria:

1. Participant is considered as being morbidly obese (defined as BMI >39.5).

2. Compromised circulation, injury, or physical malformation of fingers, hands, ears or forehead/skull or other sensor sites which would limit the ability to test sites needed for the study. (Note: Certain malformations may still allow participants to participate if the condition is noted and would not affect the sites utilized)

3. Participants of childbearing potential who are pregnant, who are trying to get pregnant, or who have a urine test positive for pregnancy on the day of the study.

4. Subjects with COHb levels >3% as assessed by CO-Oximetry during the procedure

5. tHb < 10 g/dl as assessed by CO-Oximetry during the procedure

6. MetHb ≥ 2% as assessed by CO-Oximetry during the procedure

7. Participants with known respiratory conditions such as:

   1. uncontrolled / severe asthma
   2. flu or influenza type infection
   3. pneumonia / bronchitis
   4. shortness of breath / respiratory distress
   5. unresolved respiratory or lung surgery
   6. emphysema, COPD, lung disease
   7. recent COVID (last 2 months)

8. Participants with known heart or cardiovascular conditions such as:

   1. Uncontrolled hypertension (systolic pressure >140mmHg, or diastolic pressure >90mmHg on 3 consecutive readings day of screening)
   2. previous cardiovascular surgery
   3. chest pain (angina)
   4. heart rhythms other than a normal sinus rhythm or with respiratory sinus arrhythmia (reviewed during health screen)
   5. previous heart attack
   6. blocked artery
   7. unexplained shortness of breath
   8. congestive heart failure (CHF)
   9. history of stroke and/or transient ischemic attack
   10. carotid artery disease
   11. myocardial ischemia
   12. myocardial infarction
   13. cardiomyopathy
   14. implantable active medical device such as pacemaker or automatic defibrillator

9. Self-reported health conditions as identified in the Health Assessment Form:

   1. Diabetes
   2. uncontrolled thyroid disease
   3. kidney disease / chronic renal impairment
   4. history of seizures (except childhood febrile seizures)
   5. epilepsy
   6. history of unexplained syncope
   7. recent history of frequent migraine headaches (within the last 2 months)
   8. recent symptomatic head injury (within the last 2 months)
   9. cancer requiring chemotherapy, radiation, or current treatment
   10. participants with known clotting disorders
   11. history of bleeding disorders or personal history of prolonged bleeding from injury
   12. history of blood clots
   13. hemophilia
   14. sickle cell trait or disease
   15. current use of blood thinner: prescription or daily use of aspirin
   16. participants with severe contact allergies to standard adhesives, latex or other materials found in pulse oximetry sensors, ECG electrodes, respiration monitor electrodes or other medical sensors
   17. participants with severe allergy to iodine (only applicable if iodine is used)
   18. participants with prior or known severe allergies to lidocaine (or similar pharmacological agents, e.g. Novocain) or heparin
   19. arterial cannulation within the last 30 days prior to study date, (this may exclude only one radial artery site, left or right)
   20. history of clinically significant complications from previous arterial cannulation
   21. unwillingness or inability to remove colored nail polish or colored artificial nails other than clear from test digits
   22. other known health condition, upon disclosure in Health Assessment form

10. Failure of the Allen's Test.

Healthy participants ≥ 18 and < 51 years of age, with varying skin tones and diversity across ethnicity, race, gender, and sex assigned at birth.