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For the estimation of hemoglobin by oxyhemoglobin method, blood sample is mixed with a weak ammonia solution and then absorbance of this solution is deliberated in a photometer using a yellow-green filter or measured in a spectrophotometer at 540 nanometer. Absorbance of the test sample is corresponded with that of the standard solution.For the estimation of hemoglobin by oxyhemoglobin method, blood sample is mixed with a weak ammonia solution and then absorbance of this solution is deliberated in a photometer using a yellow-green filter or measured in a spectrophotometer at 540 nanometer. Absorbance of the test sample is corresponded with that of the standard solution.

This method is much similar to cyanmethemoglobin (hemoglobin-cyanide) method.

This method is very simple and rapid but this method is not much reliable as compared to cyanmethemoglobin method because there is no stable standard solution is available, derivatives of hemoglobin except oxyhemoglobin are not measured, and color of oxyhemoglobin solution swiftly dims.

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