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If only two parameters from the full blood count are low, the term bicytopenia can be used. The diagnostic approach is the same as for pancytopenia.
- anemia: hemoglobin < 13.5 g/dL (male) or 12 g/dL (female).
- leukopenia: total white cell count < 4.0 x 109/L. Decrease in all types of white blood cells (revealed by doing a differential count).
- thrombocytopenia: platelet count < 150×109/L.
The disease is marked by an inappropriate and ineffective T cell activation that leads to an increased hemophagocytic activity. The T cell activated macrophages engulf erythrocytes, leukocytes, platelets, as well as their progenitor cells. Such finding is common in the syndrome, which is also referred to as hemophagocytic lymphohistiocytosis (HLH). Along with pancytopenia, HLH is characterized by fever, splenomegaly, and hemophagocytosis in bone marrow, liver, or lymph nodes.
Iatrogenic causes of pancytopenia include chemotherapy for malignancies if the drug or drugs used cause bone marrow suppression. Rarely, drugs (antibiotics, blood pressure medication, heart medication) can cause pancytopenia. The antibiotic Linezolid can cause pancytopenia in some individuals.
Pancytopenia usually requires a bone marrow biopsy in order to distinguish among different causes.
Causes of pancytopenia 
- Familial Hemophagocytic Syndrome
- Aplastic anemia
- Gaucher's disease
- Dyskeratosis congenita
- Myelodysplastic syndrome
- Severe Folate or vitamin B12 deficiency
- Systemic Lupus Erythematosus
- Paroxysmal nocturnal hemoglobinuria (urine test)
- viral infections (HIV most common).
- Alimentary Toxic Aleukia
- Copper deficiency
- Pernicious anemia
- Low dose arsenic poisoning
- Sako disease (Myelodysplastic-cytosis)
- Chronic Radiation Sickness 
- LIG4 syndrome
See also 
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