All true about interaction of reading of spo2 and methemoglobinaemia, except-: (A) MetHb absorbs red and infrared wavelength of light in a 1:1 ratio corresponding, (B) Increase in Methb produce an underestimation when spo2 > 70%, (C) Increase in Met Hb produce an overestimation when spo2 <70%, (D) Does not get affected in Methemoglobinaemia
Answer is D. Met Hb absorb red and infrared wavelengths of light in a 1:1 ratio corresponding to an SpO2 of approximately 85%. Therefore, increases in Met Hb produce an underestimation when SpO2> 70% and an overestimation when SpO2 <70%.