Description
Why It’s Done:
The methaemoglobin estimation test is typically performed to:
• Diagnose methaemoglobinemia, which can be caused by:
o Genetic factors (congenital methaemoglobinemia)
o Exposure to certain chemicals or drugs, such as:
Nitrates/nitrites in food or drinking water
Aniline dyes
Benzocaine or other local anesthetics
o Infections or toxic substances (e.g., exposure to chemicals in industrial settings)
• Monitor the severity of methaemoglobinemia and guide treatment decisions.
• Evaluate cyanosis (bluish skin), especially in newborns or individuals with unexplained low oxygen saturation.
• Help in the management of patients who show signs of oxygen deprivation despite normal levels of oxygen saturation, as methaemoglobin prevents proper oxygen binding and transport.
Preparation:
• No special preparation is typically required.
• A blood sample is drawn from a vein in your arm for the test.
• Inform your healthcare provider of:
o Any medications or chemicals you are exposed to, as certain substances (like nitrates or local anesthetics) may affect the results.
o Your medical history, especially if you have a family history of congenital methaemoglobinemia.
