An unexpected emergency request for glucose-6-phosphate dehydrogenase testing in a 9-year-old African American boy.

PATIENT 9-year-old African American male. CHIEF COMPLAINT Recently diagnosed with acute lymphoblastic leukemia (ALL) after investigation into a large anterior mediastinal mass causing airway compression. HISTORY OF PRESENT ILLNESS The day before the unexpected urgent glucose-6-phosphate dehydrogenase (G6PD) request, the patient was diagnosed with an aggressive form of leukemia and a significant tumor mass causing airway compression. A computed tomography (CT) scan indicated potential renal involvement. Based on this information and the size of the mass, the patient was referred for immediate chemotherapy. However, there was a concern that he could develop tumor lysis syndrome (TLS) during treatment. To avoid this condition, the pediatric intensive care unit (ICU) sought to pretreat the child with rasburicase, which led to the emergency G6PD request. PREVIOUS MEDICAL HISTORY Unknown. FAMILY HISTORY Largely unknown, but no apparent chronic diseases. PHYSICAL EXAMINATION FINDINGS Three weeks of progressively worsening lymphadenopathy, coughing, night sweats, mild hepatosplenomegaly, and breathing difficulty when supine. The patient arrived at the medical center for airway management and had a temperature of 36.1°C; blood pressure, 120/87 mmHg; pulse, 115 bpm; respiratory rate, 22 breaths per minute, with labored breathing but normal O(2) saturation while upright and awake, in room air. PRINCIPLE LABORATORY FINDINGS Table 1.