Human IFN alpha Assay Kit

Mainly produced by leukocytes, IFNα is involved in innate immunity response to viral infection.
IFNα activates several intra-cellular pathways in target cells, which explains its pleiotropic effects on cell differentiation, growth and immunoregulation.
Cisbio's Human IFNα kit is a homogeneous, add and read assay to measure IFNα 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) 11 pg/mL & 36 pg/mL
Calibration NIBSC (94/784) value (IU/mL) = 0,9 x HTRF hIFNα HTRF
Range 36 – 4,000 pg/mL
Time to result 2h at RT
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 IFN alpha analysis.


How to use HTRF cytokine assays

How to measure multiple cytokines from 1 sample

Analytical performance


Intra-assay (n=24)

Sample Mean [IFNα] (pg/mL) CV
1 150 11%
2 1500 2%
3 3000 5%
  Mean CV 6%

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

Inter-assay (n=4)

Sample [IFNα] (pg/mL) Mean (delta R) CV
1 47 268 9%
2 206 1150 5%
3 1905 4227 4%
    Mean CV 6%

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 IFN alpha kit - 500 tests62HIFNAPEG
Human IFN alpha kit - 10,000 tests62HIFNAPEH

Companion products

DescriptionCat. noProduct insertMSDS
Human IFN alpha kit - 3 Standards62HIFNACD3
Human IFN alpha kit - Standard62HIFNACDA