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What to do if…
your lips or fingertips turn blue or a pulse oximeter shows unexpectedly low oxygen

Produced and maintained by PanicStation.org Published: Last reviewed: Editorial policy USA guide

Short answer

Call 911 now if the lips or face are blue, or if there is trouble breathing, chest pain or pressure, new confusion, fainting, or difficulty waking. If there are no emergency symptoms, repeat one pulse-oximeter reading correctly; contact a healthcare provider if it stays at 92% or lower, and seek immediate medical attention if it is 88% or lower, unless a clinician has given you a different personal action plan.

Do not do these things

  • Do not delay calling 911 while repeatedly checking the pulse oximeter.
  • Do not rely only on the number if the person looks or feels seriously unwell.
  • Do not assume a normal reading rules out an oxygen or breathing problem.
  • Do not assume cold hands or nail polish explain blue lips, breathing difficulty, confusion, or chest symptoms.
  • Do not change prescribed oxygen flow or take extra medicine unless an existing medical plan, a clinician, or the 911 dispatcher directs you to.

What to do now

  1. Call 911 immediately if the lips or face are blue, or if there is difficulty breathing, chest pain or pressure, new confusion, fainting, unusual sleepiness, difficulty waking, or rapid worsening. Tell the dispatcher about the color change and any pulse-oximeter reading.
  2. Stop physical activity and stay still while help is arranged. Follow the 911 dispatcher’s instructions and have someone remain nearby when possible.
  3. Follow any existing emergency plan exactly as written, including instructions for prescribed oxygen or rescue medicine. Do not make unplanned changes to the oxygen flow.
  4. If there are no emergency symptoms, repeat the pulse-oximeter reading once. Follow the device instructions, warm and relax the hand, hold it below heart level, remove fingernail polish from the test finger when practical, keep still, and wait for one steady number.
  5. If the repeat reading is 88% or lower, seek immediate medical attention. Call 911 if emergency symptoms are present, the person is worsening, or safe transportation is uncertain.
  6. If the repeat reading remains at 92% or lower, contact a healthcare provider or urgent-care service promptly. People with chronic heart or lung conditions or those at high altitude may have a different usual range, so follow any personal threshold provided by a clinician.
  7. If only the fingertips changed color after cold exposure and there are no other symptoms, move to a warm place and warm the hands gradually. Get prompt medical help if the color persists after warming, spreads to the lips or face, or occurs with pain, numbness, weakness, breathing difficulty, chest symptoms, or confusion.
  8. Write down the readings, the time, the symptoms, recent activity, and any prescribed oxygen or medicine used. Give this information to the healthcare provider or emergency team.

What can wait

You do not need to identify the cause, search through possible diagnoses, buy another device, or decide anything about long-term oxygen or treatment now. Focus on emergency warning signs, one careful repeat reading when it is safe to do so, and getting the appropriate medical help.

Important reassurance

A single unexpected pulse-oximeter reading can be inaccurate because of cold skin, poor circulation, fingernail polish, skin thickness, skin pigmentation, or device limitations. Symptoms and visible color changes still matter, so blue lips, serious symptoms, or a persistently low reading should not be dismissed.

Scope note

This guide covers immediate first steps only. Confirming the oxygen level, finding the cause, and deciding on treatment may require assessment and testing by a healthcare professional.

Important note

This is general health information, not medical advice or a diagnosis. Follow any personal emergency or oxygen plan provided by a healthcare professional, and use emergency services when symptoms are severe or worsening.

Additional Resources

Closely connected guides that may be useful during the same situation or its immediate aftermath.

About this guide

This guide was produced and is maintained by PanicStation.org using its published editorial process. Official and specialist sources are checked where relevant, and AI-assisted tools may be used for drafting, organisation, and consistency checks. The site operator remains responsible for publication, revision, and removal decisions.

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