Labcorp have more detail on Quantiferon, it is now listed under their test menu and was formally announced in their October 2008 newsletter.
Quest Diagnostics also have Quantiferon listed at 17 of their laboratories; Colorado, Connecticut (2), Illinois, Indianapolis, Kansas, Massachusetts (2), Missouri, New Jersey, New York, Ohio, Philadelphia, Texas (2), Virginia & Nevada. Quest also have 2 additional labs listed under Get Quantiferon.
Presently Get QuantiFERON has 95 labs listed as having "agreed to provide QFT testing services to outside physicians and laboratories."
Meanwhile the BCG Japan site continues to announce more labs which are adding up to a considerable quantity.