A 4-year-old boy presents to ED as his parents are concerned, he seems lethargic and sleepy
A 4-year-old boy presents to ED as his parents are concerned, he seems lethargic and sleepy. On examination, he is pale with a distended abdomen and there is painless palpable lymphadenopathy in his axillary and cervical regions. His testes are mildly enlarged.
Preliminary blood tests reveal the following:
| Hb | 63 g/L | (115-140 g/L) |
| WCC | 23 x 10⁹/L | (5-17 x 10⁹/L) |
| Neutrophils | 0.6 x 10⁹/L | 1.0-8.5 x 10⁹/L |
| Platelets | 35 x 10⁹/L | 150-400 x 10⁹/L |
What is the most appropriate next investigation?
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