Human IL4 Assay Kit

IL4 is expressed by T cells, NK cells and mast cells, and is an important regulator of humoral and adaptative immunity. It stimulates activated B cells, and induces their differentiation into plasma cells and their class switch to immunoglobulin E, as well as promoting class II MHC expression.
In immuno-oncology, IL4 induces the differentiation of naïve T cells into TH2 cells, which in turn produce IL4 and thus create a positive feedback loop.
IL4 is also involved in the development of airway inflammation and allergic asthma.
Cisbio's Human IL4 kit is a homogeneous, add and read assay to measure IL4 secretion in supernatant. It offers a fast, efficient alternative to ELISA.

Sample size 16 µL
Final assay volume 20 µL
Kit components Lyophilized standard, frozen detection antibodies, buffers & protocol.
LOD & LOQ (in Diluent) 8 pg/mL & 29 pg/mL
Range 29 – 4,000 pg/mL
Time to result 2h at RT
Calibration NIBSC (88/656) value (IU/mL) = 0,012 x HTRF hIL4 value (pg/mL)
Species Human only
Download Insider tips for PBMC isolation Technical Note
Download cytokine release from fresh blood samples application notes

Assay principle

The assay protocol, using a Cisbio 96-well low volume or a 384-well small volume white plate (20 µL final), is described below. Cell supernatant, sample or standard are dispensed directly into the assay plate for the detection by HTRF® reagents. The antibodies labeled with the HTRF donor and acceptor are pre-mixed and added in a single dispensing step, to further streamline the assay procedure. The assay can be run in 96 to 1536-well plates by simply resizing each addition volume proportionally.

The 4 Parameter Logistic (4PL) curve is commonly recommended for fitting an ELISA standard curve. This regression enables the accurate measurement of an unknown sample across a wider range of concentrations than linear analysis, making it ideally suited to the analysis of biological systems like cytokine releases.


Cytokines assay principle add


Cytokines assay principle read

(1) Assay data analysis:

  • "Guidelines for data reduction" button will show you how dealing with HTRF data processing and 4PL 1/y2 fitting.
  • "MyAssays" button will direct you to a free online software able to run IL4 analysis.


How to use HTRF cytokine assays

How to measure multiple cytokines from 1 sample

Analytical performance


Intra-assay (n=24)

Sample Mean [IL4] (pg/mL) CV
1 50 7%
2 1895 2%
3 3598 3%
  Mean CV 4%

Each of the 3 samples was measured 24 times, and % CV was calculated for each sample.

Inter-assay (n=4)

Sample [IL4] (pg/mL) Mean (delta R) CV
1 98 527 12%
2 432 2061 7%
3 1905 7265 6%
    Mean CV 8%

Each of the samples was measured in 4 different experiments, and % CV was calculated for each sample

Part#, inserts & MSDS

Ordering Info

DescriptionCat. noProduct insertMSDS
Human IL4 kit - 500 tests62HIL04PEG
Human IL4 kit - 10,000 tests62HIL04PEH

Companion products

DescriptionCat. noProduct insertMSDS
Human IL4 kit - 3 Standards62HIL04CD3
Human IL4 kit - Standard62HIL04CDA