well all you really need to do is get a blood test. leukemia is a blood cancer that affects the blood cells and stuff like that. so how ever long a blood test talkes that is how ling it will take. they doctor may want to do other tests also. i don’t know how long thay take.

Here’s information on the tests used to diagnose leukemia:

You can follow the links on this site to learn more about the various types of leukemia. For more information, you should check a medical website such as the Mayo clinic website.

It takes about a week to get a firm diagnosis, although someone could give a preliminary diagnosis in a day. You need a bone marrow biopsy to diagnose leukemia.

There are four types of leukemia.

CML chronic myelogenous leukemia
CLL chronic lymphocytic leukemia
AML acute myeloblastic leukemia
ALL acute lymphocytic leukemia

AML is the worst one. chronic leukemias are usually curable in children and teenagers. I don’t know about ALL, although it is definitely more curable than AML. Your bone marrow makes all types of blood cells. Leukemia affects the white blood cells as they are made from the bone marrow. The difference is which type of white blood cell is affected.

Chronic is not as aggressive as acute, but chronic can progress to acute.

ETA: Oh, there is also hairy cell leukemia, which is very curable in both children and adults.

If your doctor thinks you have leukemia, a complete blood count as a preliminary test can have results that point to a diagnosis very quickly. You will need a biopsy, and probably some additional blood tests, to confirm the diagnosis. Some of these results will come back within the week, which is when your treatment will begin, although some advanced/genetic tests may take quite a while to get the results back on (but you will usually begin treatment before those results return, based on your other tests.)