How to Compare a Finger Pulse Oximeter

A finger pulse oximeter noninvasively measures the oxygen saturation of the user's blood using red and infrared light. Oxygenated hemoglobin absorbs more infrared light and allows more red light to pass through. This device, which attaches to the fingertip like a clothespin, emits red and infrared light from one side through the skin. A receiver on the opposite side uses the ratio of red to infrared light absorbed to calculate the blood oxygen level. This number is displayed on the device as a percentage. Normal adult oxygen saturation is between 95 percent to 100 percent.

Instructions

FDA Verification

• 1

  Verify that the finger pulse oximeter you are interested in purchasing is FDA registered. Pulse oximeters are Class II devices, and FDA registration is required before selling. Most devices are registered; however, with the proliferation of Internet sales, it is important to confirm this.

• 2

  Visit the FDA Medical Device Data Base at http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfPMA/pma.cfm/.

• 3

  Enter the manufacturer's name and device model number in the search field to confirm it has been registered with the FDA.

User Requirements

• 4

  Determine if the device is for therapeutic or athletic training purposes. While most fingertip pulse oximeters are used in a therapeutic environment, it is becoming popular for training, particularly for those who participate in high-altitude sports such as mountain climbing, skiing or hiking. Fingertip pulse oximeters used by athletes should be lightweight, small, have a neck or wrist cord and have a 30-hour continuous battery life.

• 5

  Determine the size of the person who will be using the device. Is he very small or very large? If needed, seek a manufacturer that offers pulse oximeters specifically designed for infants, children or very small or very large individuals.

• 6

  Determine the stability of the user's hand. If his hand trembles, find a finger pulse oximeter model that is more tolerant to hand movements. Accuracy is often affected by motion.

• 7

  Ensure that the readouts are large enough for the user to see easily, particularly if they will be using it unaided.

Features

• 8

  Determine if the user's physician requires any special device features. Fingertip pulse oximeters are available with a multitude of features, which typically increase the cost. Most features are not necessary to provide an accurate oxygen saturation level. However, some health-care professionals may request a computer interface or memory component that saves readings, generates statistics and date- and time-stamps readings for additional analyses.

• 9

  Choose a device that has an automatic shut-off to conserve battery life.

• 10

  Choose a wireless device or one with the least amount of extraneous cords and wires. Most devices are available without wires, which tend to get tangled and bent.

• 11

  Choose a device with batteries that can be changed without a screwdriver or tool.