Did Sadako know she had leukemia?
When Sadako got leukemia, no one had any real hope of curing it. No one on the hospital staff or even in her own family ever told Sadako the name of her disease. And yet, for some reason she secretly kept track of the results of her blood tests. (The normal number of white blood cells is 4,000 to 8,000 per cubic millimeter. Leukemia causes that number to rise dramatically, often over 100,000.)

Sadako's Medical Record