| All patients |
| Serum BUN, creatinine, electrolytes, and glucose |
| Complete blood count with reticulocyte count |
| Urinalysis with microscopy |
| EKG |
| Chest radiograph |
| Selected patients |
| Urine toxicology screen for amphetamines, PCP, cocaine metabolites |
| Urine pregnancy test |
| Head CT or brain MRI |
