An abnormally low level of lymphocytes in the blood(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "lymphocytopenia" in a sentence
"Officials at the National Institutes of Health and the Atlanta-based Centers for Disease Control have dubbed the phenomenon ICL (for idiopathic CD4 + T-lymphocytopenia), and scientists are searching for common threads among sufferers."
"Obesity and recovery from lymphopenia after five days were factors associated with death, as determined by multivariate logistic-regression analysis (obesity, odds ratio = 23.06; lymphocytopenia reversion, odds ration = 28.69)."
"+ T lymphocytopenia, both with biopsy-proven chronic HEV infection."