Where should a nurse apply the pulse oximeter probe for a client with edema in the hands and thickened toenails?

The appropriate site to apply the pulse oximeter probe for a client experiencing edema in the hands and thickened toenails is the earlobe. When assessing oxygen saturation levels, it is essential to choose a site that allows for accurate readings, especially when other commonly used sites may be compromised.

In this case, utilizing the earlobe is advantageous because it is less likely to be affected by peripheral edema, which could interfere with accurate readings at the fingertip. Additionally, thickened toenails can also hinder proper sensor placement and functionality on the toes. The earlobe offers good perfusion and a relatively flat surface for the sensor, which can enhance the reliability of the oxygen saturation measurement.

While finger and toe placements are often the most common sites for pulse oximetry, conditions such as edema or compromised circulation can result in inaccurate readings. The wrist is not generally an ideal site due to potential movement and decreased blood flow compared to the ear. Therefore, the earlobe emerges as the best choice in this scenario to obtain precise and reliable oxygen saturation levels.