Do you recommend testing for G6PD deficiency in those with whom rasburicase for tumor lysis syndrome is indicated?  

G6PD deficiency is a contraindication to the use of rasburicase and should be tested for prior to the use of this drug.

You're supposed to test, but most do not. It's X-linked, so males are more susceptible. Certain populations are too: sub-Saharan Africa, the Mediterranean, and Southeast Asia.