Example of Calculation
The Doctor has ordered a hemoglobin assay on his patient Johnnie B. Goode. When you ran the assay you got an absorbance of 0.350. The 14 gm/dL hemoglobin standard gave an absorbance of 0.450
Cu = Au x Cs
           As   
Cu = 0.350 x 14 gm/dL
           0.450   
Cu = 10.9 gm/dL
Johnnie B. Goode has a Hb = 11 gm/dL