Innate lymphoid cells (ILCs) comprise cytotoxic NK cells and helper-ILCs, which are further divided in ILC1, ILC2, and ILC3. Helper-ILCs mirror the effector functions of helper T-cell subsets and contribute to host immune defense, tissue homeostasis and repair through cytokine secretion. Although they are mainly tissue-resident, helper ILCs are also found in the peripheral blood (PB). In the human setting, it may be needed to analyze circulating helper ILCs to compare pathological to physiological conditions. In this review, we provide simple guidelines and a list of markers useful to study human PB helper ILCs phenotype and function by flow cytometry.
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