• 0-2

    Minimal—An index reading of 0 to 2 means minimal danger from the sun's UV rays for the average person.

  • 3-4

    Low—An index reading of 3 to 4 means you may be at risk of skin damage from the sun's rays. Many people can experience a sunburn in 45 minutes.

  • 5-6

    Moderate—An index reading of 5 to 6 means you may be at some measurable risk of skin damage due to the sun. Many people can experience a burn in only 30 minutes.

  • 7-9

    High—An index reading of 7 to 9 means you may be at high risk of harm from unprotected exposure to the sun. Many people can burn in under 15 minutes.

  • 10+

    Very High—An index reading of 10 and above means you are at maximum risk of harm from unprotected sun exposure. Many people burn in as little as 10 minutes without protection.

Clinical Trials

Clinical trials are research studies that evaluate a new medical approach, device, drug, or other treatment. As a Stanford Health Care patient, you may have access to the latest, advanced clinical trials.

Open trials refer to studies currently accepting participants. Closed trials are not currently enrolling, but may open in the future.