leukocytopenia

synonym: leukopenia
https://doi.org/10.1351/goldbook.13382
Amount of leukocytes below normal values that is a characteristic feature of systemic autoimmune diseases [e.g., Felty syndrome, systemic lupus erythematosus (SLE), Sjögren syndrome, mixed connective tissue disease (MCTD)].
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1201 [Terms] [Paper]