It depends on the kind of sample you have. For example, if you have purified hemoglobin (or the hemoglobin just coming from isolated erythrocytes) you can evaluate it by simple absorbance measurement for example at 413 nm (I use this wavelenght) and then use the extinction coeffient at 413 nm (you can find the different coefficients just googling). If you want a more accurate assay, especially in a complex mixture, you can use the cyanmethemoglobin assay or the azide methemoglobin assay. Unfortunately I have nothing more than name of the assays, since I've just studied them during classes...I hope it might help you searching for something more specific...
There are several options, depending on what your goal is. If you want to just get total Hb, as noted above, in simple OxyHb solutions, you can use the Oxy peak around 413/414 nm. However, if it's likely you have a mix of Oxy and Met (which is generally likely), the isobestic point at 409/410 is better for total Hb.
Alternately, the cyanmethemoglobin assay can be used to assay total Hb:
http://www.sciencedirect.com/science/article/pii/S0305049197002307
If you want to know the make up of your Hb solutions, how much oxy how much met, then using multiple wavelengths is best, such as the Winterbourn method:
http://www.sciencedirect.com/science/article/pii/007668799086118F
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