Final answer:
Nail polishes containing toxic chemicals like DBP, toluene, and formaldehyde can cause falsely low SaO2 readings. Choosing '3-free' or '5-free' nail polishes and ensuring proper ventilation can help avoid this issue.
Step-by-step explanation:
Nail polishes that contain toxic chemicals such as dibutyl phthalate (DBP), toluene, and formaldehyde can cause falsely low SaO2 readings. These chemicals can be absorbed through the nail bed and affect the accuracy of oxygen saturation measurements. To avoid falsely low SaO2 readings, it is recommended to choose nail polishes that are labeled as '3-free' or '5-free', indicating that they are free from these toxic chemicals. Additionally, it is important to ensure proper ventilation when applying nail polish to minimize chemical exposure.