Step 1: Understanding the Concept: Hemoglobin estimation methods rely on converting hemoglobin into a stable colored derivative that can be visually or photometrically measured.
Step 2: Key Formula or Approach: The approach relies on identifying the specific chemical conversion and the resulting hemoglobin derivative each estimation method utilizes.
Step 3: Detailed Explanation: In the Haldane Method, blood is mixed with a diluting fluid and exposed to carbon monoxide (usually from coal gas), which converts the hemoglobin specifically into carboxyhemoglobin.
The intensity of the resulting pink-red color is then visually matched against a standard carboxyhemoglobin tube.
Sahli’s Method converts hemoglobin to acid hematin using dilute hydrochloric acid.
The Cyanmethemoglobin Method converts hemoglobin to cyanmethemoglobin using Drabkin's reagent.
The Tallqvist method is a simple direct color comparison of a blood drop on blotting paper against a standardized color chart.
Step 4: Final Answer: The Haldane Method specifically forms carboxyhemoglobin for the estimation of hemoglobin.