11 Essentials for Accurate Pulse Oximeter Readings

6. Nail polish, artificial nails, and how to avoid errors

Dark nail polish and acrylic or artificial nails can block the light path and distort readings. The simplest fix is to remove polish from the finger you plan to use or choose an alternate finger without polish. If that is not possible, use the earlobe or another site that the probe can access. When caring for elders who often have painted nails or long nails, keep a small buffer or nail remover in the first-aid kit so a quick check doesn’t become a guessing game. Artificial nails can be lifted slightly near the nail plate to allow light through if removal isn’t feasible, but removal is preferable. Also, ensure the sensor does not press too tightly and that the finger is free of lotion or dirt that could scatter light. These steps reduce a common source of false low or unstable readings and are easy to apply before a check.