An 18 year old male presents with a
history of yellow discolouration of his eyes, passage of dark urine and fever
of several days duration. He says that he has had several such episodes since
childhood. One of his brothers has had a similar problem and has undergone
On examination he is jaundiced,
febrile and there is cervical lymphadenopathy, his throat looks inflamed and
his spleen is palpable.
Hb 8.9 g/dL
WBC 6.5 x109 /L
Platelets 160 x109 /L
Bilirubin 60 µmol/L
Urine urobilinogen ++++
In this patient which of the following
tests is likely to lead to a diagnosis?