: Excess Residual Cytoplasm (Neutrophil Fluorescence Reduction) Measurement

: What Is Being Measured

: Neutrophils are white blood cells that help fight infection. As they mature, they normally lose most of their internal fluid (cytoplasm). This test estimates how much cytoplasm remains, referred to as excess residual cytoplasm, using a fluorescence signal that is reduced when less cytoplasm is present.

: How the Test Works

: A blood sample is processed in the laboratory so that neutrophils can be examined with a fluorescence-based measurement. The instrument detects a signal related to the cytoplasm content of these cells. The term "fluorescence reduction" indicates that the measured signal changes depending on how much residual cytoplasm is present.

: Why Your Doctor May Order It

: This is not a routine test. It may be used in specialized settings to study neutrophil maturation or to support evaluation of certain blood or immune conditions. Your doctor will interpret the result alongside your medical history, other blood counts, and additional tests.

: What the Results Mean

: Results are reported by the laboratory using its own method and reference information, so the meaning depends on the specific testing system. An abnormal value alone does not diagnose a condition. Your care team will explain what your result suggests in the context of your overall health.