Author Question: The relative transmission and/or absorption of portions of the light spectrum are the basis for ... (Read 30 times)

Mr3Hunna · **on:** Jul 16, 2018

The relative transmission and/or absorption of portions of the light spectrum are the basis for which of the following?

a. Amperometry c. Spectrophotometry
b. Plethysmography d. Potentiometry

Question 2

Which of the following is true concerning the typical point-of-care blood gas analyzer?

a. It is only able to measure pH, PaCO2, and PaO2.
b. It measures actual hemoglobin oxygen saturation.
c. It uses silicone chips with microelectrodes.
d. It requires 1 to 2 mL of blood.

joanwhite · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: C
Oximeters operate on the principle of spectrophotometry, which is based on the relative transmis-sion or absorption of portions of the light spectrum. Amperometry refers to measuring an electri-cal current at a single applied potential. A plethysmograph is a type of instrument that is used to measure changes in volume within an organ or the entire body. Potentiometry uses changes in voltage to measure pH and PCO2.

Answer to Question 2

ANS: C
Point-of-care blood gas analyzers use solid-state sensors, which rely on either fluorescence tech-nology or thin-film electrodes that have been fabricated onto silicone chips. The microelectrodes are incorporated into a single-use disposable cartridge that also contains calibration reagents, a sampling stylus, and a waste container.