Diagnostic Tests for Detecting and Staging Acute Myeloid Leukemia (AML)
In the quest to diagnose Acute Myeloid Leukemia (AML), doctors employ a multi-faceted approach, integrating various tests to accurately classify the disease and tailor the best treatment options.
The initial step in diagnosing AML involves extracting a blood sample and analyzing it for signs of the disease. A Complete Blood Count (CBC) with differential is conducted to detect abnormal levels typical in AML. This test measures the number of red blood cells, white blood cells, and platelets in the blood.
A peripheral blood smear is another crucial diagnostic tool. It involves examining the sample under a microscope to examine the cells' number, size, and shape for characteristic abnormalities.
For a more comprehensive analysis, a person will undergo two bone marrow tests, called bone marrow aspiration and biopsy, to obtain two types of bone marrow samples. These tests are essential in confirming the AML diagnosis and subtype.
Multiparameter flow cytometry and immunophenotyping, cytogenetic testing, and molecular genetic testing also play significant roles in the diagnostic process. Flow cytometry uses panels of surface markers to distinguish AML from other leukemias and identify specific cell types, including subpopulations like plasmacytoid dendritic cells, which can indicate certain AML variants. Cytogenetic testing detects chromosomal abnormalities relevant to AML classification, while molecular genetic testing identifies somatic mutations such as RUNX1 that aid in subtype classification and prognosis.
Serum lactate dehydrogenase (LDH) testing is another important diagnostic test. Elevated LDH levels correlate with leukemia subtype and blast count and can assist in distinguishing AML from other leukemias like ALL.
While imaging scans are not typically used for people with AML, they can be used to assess a person's general health and identify the causes of their symptoms. CT scans, PET/CT scans, MRI scans, and ultrasound scans can help detect enlarged organs or lymph nodes in the body and infections in the organs.
In some cases, a lumbar puncture may be performed to remove a sample of cerebrospinal fluid to check if the leukemia cells have spread into the brain and spinal cord. A physical exam may also be conducted to look for physical signs of AML, such as enlarged lymph nodes, spleen and liver enlargement, areas of bruising and bleeding, and possible signs of infection.
Cytochemistry, a test that involves exposing cell samples to chemical stains that react only with some types of leukemia cells, can also help identify the type of leukemia cells someone has.
It's important to note that doctors may repeat tests to monitor someone's response to treatment. This ongoing monitoring ensures the most effective therapeutic management for each individual case.
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Science plays a crucial role in diagnosing medical conditions such as leukemia, particularly Acute Myeloid Leukemia (AML). A variety of tests including Complete Blood Count (CBC), peripheral blood smear, bone marrow tests, multiparameter flow cytometry, immunophenotyping, cytogenetic testing, molecular genetic testing, serum lactate dehydrogenase (LDH) testing, and cytochemistry are employed in the diagnostic process to accurately classify cancer like leukemia and tailor the best health-and-wellness treatment options.
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