<prompt> All of the following cause decrease in reading in values of pulse oximeter exceptMeth-HbCarboxyHbHb-S,Hb-FSulp-Hb  <response>: Pulse oximetery - Measure oxygen saturation of aerial blood SpO2 - 2 principle- Law of plethysmography -Measures the pulsatile flow of blood in capillary Law of oximetery BEER LAMBES Law Inaccuracies in pulse oximetery reading - Hypotension - Hypothermia - Other hemoglobins Sulph hemoglobin - Dyes or pigments - Dark skin color - Nail polish Blue - Jaundice and Anemia does not affect the value of pulse oximetry Poable pulse oximeter with finger probe. Pulse oximetery HbO2 HbO2 HbH CO oximetery HbO2 HbO2 HbH Sulph Hb Meth Hb Reflectance oximeter - for forehead attachment Eg. Used in amputated patients HbO2 - Oxy Hb HbH - Deoxy Hb 