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A 6-year-old boy is brought in due to pallor and decreased energy.  For the past 2 days, he has slept throughout the day.  The patient developed fever, emesis, and diarrhea 10 days ago, but symptoms resolved after a few days without intervention.  Temperature is 37.1 C (98.8 F), blood pressure is 120/70 mm Hg, and pulse is 145/min.  The patient appears tired and has pale lips.  The abdomen is soft and nontender.  There are a few small bruises along the bilateral shins.  Laboratory results are as follows:
一个 6 岁的男孩因面色苍白和精力下降被带来就诊。在过去的 2 天里,他整天都在睡觉。患者在 10 天前出现发热、呕吐和腹泻,但症状在几天后自行缓解,没有进行干预。体温为 37.1°C(98.8°F),血压为 120/70 mm Hg,脉搏为 145 次/分钟。患者看起来很疲惫,嘴唇苍白。腹部柔软且无压痛。双侧小腿有几处小淤伤。实验室结果如下:

Complete blood count 全血细胞计数
Hemoglobin 血红蛋白6.4 g/dL (64 g/L)
Platelets 血小板30,000/mm3 (30 × 109/L) 30,000/mm3 (30 × 10^9/L)
Leukocytes 白细胞15,200/mm3 (15.2 × 109/L)
15,200/mm3 (15.2 × 10^9/L)
 
Serum chemistry 血清化学
Creatinine 肌酐2.4 mg/dL (212.2 μmol/L)
Liver function studies 肝功能研究
Total bilirubin 总胆红素3.3 mg/dL (56.4 μmol/L)
Direct bilirubin 直接胆红素0.1 mg/dL (1.71 μmol/L)
Coagulation studies 凝血研究
PT12 sec 12 秒
Activated PTT 活化部分凝血酶时间35 sec 35 秒

Urinalysis has 20-30 red blood cells/hpf.  Which of the following is the most likely diagnosis?
尿液分析显示每高倍视野有 20-30 个红细胞。以下哪项最可能是诊断结果?

 A.
Autoimmune hemolytic anemia