Question

If levels of carboxyhaemoglobin in blood reaches up to ...... the functioning of central nervous system is severely affected which causes death?

• A. 1 to 2%
• B. 0.20 to 0.30%
• C. 0.30 to 0.40%
• D. 0.1 to 5%

Answer 1

Answer: (D)

0.1 to 5%

Carboxyhemoglobin (COHb) is a stable complex of carbon monoxide that forms in red blood cells when carbon monoxide is inhaled.

The reference range of COHb differs among individuals. For a normal person it is up to 3%. Individuals with hemolytic anemia and neonates may have COHb levels of up to 5%.

Hence, above 5%, the functioning of central nervous system can be severely affected. So, the answer is D.