EKG

Lab Workup
- WBC 6.4K (normal differential), Hgb 12.4, Plt 245K
- Na+ 141, K+ 3.5, Cl– 108, HCO3– 22, BUN 18, Cr 0.8, Glucose 105
- AST: 26, ALT 31, Total Bilirubin 0.4, Albumin 3.4
- TSH: 0.2 (Normal 0.5-5.0), Reflex T4: 32 (Normal 5-12)
- Stool Ova and Parasite: Negative
- Stool Na+: 35, Stool K+: 85
What further workup would you perform for this patient?