How long does it take for leukemia to build in your body before it is diagnosed daughters symptom was swollen gums diagnosed and five days later pass?

Variable: Chronic leukemias (cml, cll) may develop very slowly. Acute leukemias (aml, all) are often more "acute" and fast developing. Exactly when a leukemia develops and is clinically noticed is impossible to say. I'm sorry to hear about your daughter.

Blood test: Is a very helpful test. A blood chem panel will produce numbers that will present if the values are within normal limits. Swollen gums can be anything and is merely one of the many symptoms to diagnose leukemia. I'm sorry for your loss...