Blood-test is generally not done to treat nausea in cases of children unless the etiology calls for it. Before the doctors could realise that cause of nausea was something more than an upset stomach, their conditioned has worsened much. The elder one was also put on saline drip but it was too late.

Also, normal blood tests cannot find out anything more than the extent of infection by counting the leukocytes. In this case, the blood tests would have come out normal.

If you hold doctors responsible then I guess you would agree that every such case of nausea should be investigated with all internal tests and blood-work. Do you think its practical? Doctors treat on the basis of symptoms.