Final answer:
A pulse oximeter can display inaccurate saturation readings if the user has nail polish on, is experiencing hypothermia, or is in conditions with increased ambient light. Elevated blood pressure is not a common cause of inaccuracy in pulse oximetry. Option b is correct.
Step-by-step explanation:
The presence of nail polish can cause a pulse oximeter to display an inaccurate saturation because the polish can interfere with the device's ability to properly send and receive light through the finger, leading to erroneous readings. Other factors that can impact accuracy include hypothermia, where the decreased body temperature can affect peripheral circulation, and increased ambient light, which might interfere with the sensor's ability to accurately measure the light absorption.
Contrary to what some might think, elevated blood pressure is not generally listed among the common factors that cause inaccuracy in pulse oximetry readings. Pulse oximeters function by measuring the light absorption of hemoglobin in the blood, providing a percentage saturation of oxygen.
This measurement can be affected by several factors, such as changes in blood pH levels, increased levels of carbon dioxide in the blood, and an individual's state of exercise or exertion. Additionally, it's important to note that conditions such as sickle cell anemia and thalassemia can affect the blood's oxygen-carrying capacity, which in turn might impact oximeter readings.