In the urgent care, you see a 12-year-old boy with a complai…

In the urgent care, you see a 12-year-old boy with a complaint of frequent urination. His mother is concerned because her father has had type 2 diabetes mellitus for several years. Urinalysis in the urgent care shows the presence of glucose. You suspect that the boy may have type 1 diabetes mellitus because he also has:

A 12 yr old male with AML is hospitalized for intensificatio…

A 12 yr old male with AML is hospitalized for intensification of chemotherapy. He is started on Bactrim, acyclovir and fluconazole prophylaxis. He develops prolonged fevers >10 days with an increased oxygen requirement. CXR demonstrates low lung volumes. He is receiving Vancomycin and Zosyn and FARVPP is negative. What is the next BEST test to perform for diagnostics?