This ELISA kit provides quantitative measurement of human TNFSF13 (APRIL/A Proliferation-Inducing Ligand) in biological samples, supporting research into B cell biology, humoral immunity, and inflammatory disease. Because APRIL is a secreted cytokine whose circulating levels shift modestly between health and disease — and may be present at low concentrations in mucosal or in vitro systems — precise detection across a defined dynamic window is essential.
Detection Range: The 7.8–500 pg/mL range aligns with reported serum APRIL concentrations in healthy individuals and the elevated levels observed in autoimmune and lymphoproliferative conditions, minimizing the need for extensive sample dilution while capturing disease-relevant shifts.
Sensitivity: At 3.9 pg/mL, the kit detects APRIL in low-abundance matrices such as saliva and conditioned media from stimulated B cells or dendritic cell co-cultures, where secreted levels may fall well below circulating concentrations.
Sample Compatibility: Validation across serum, plasma, saliva, and cell culture supernatants enables researchers to correlate systemic APRIL levels with mucosal immunity or dissect APRIL secretion kinetics in vitro within a single assay platform.
Assay Efficiency: Requiring only 50–100 µL per well and completable in 1–5 hours, the kit accommodates limited-volume clinical specimens and time-sensitive experiments involving primary human B cell or myeloid cell cultures.
This kit is directly applicable to studies of IgA nephropathy, systemic lupus erythematosus, and B cell lymphoma tumor microenvironments.