To my knowledge the only way to quantify ferritin is by running western blots including ferritin standards (purified ferritin of known concentrations) or ELISA if available for your species.

Measuring total iron binding ability in testis may not be feasible. Total iron binding capacity (TIBC) is determined routinely in blood samples, but then it mainly reflects the iron binding capacity of transferrin. How much sense such a measurement would make in the testis I don´t know, but with transferrin being responsible for transporting iron in the blood, I would doubt that one gets meaningful results form measuring TIBC in testis.

If you are interested in figuring out if your testis are iron loaded or not, you may try histochemical methods such as prussian blue or enhanced pearl´s stain (see this article: http://www.ncbi.nlm.nih.gov/pubmed?term=22496346 if the link doesn´t work search pubmed for 22496346 ).

If you are even more interested in the iron content of ferritin, you could go for electron microscopy with very high resolution and measure the sizes of the iron cores in ferritin and measure iron loading of ferritin by this way...

Please send the link oncee again...

Now the link should work.