ELISA Kit for Complement C4-B (C4B)

CO4; CPAMD3; Basic complement C4; C3 and PZP-like alpha-2-macroglobulin domain-containing protein 3; Complement component 4B, Chido blood group


This assay has high sensitivity and excellent specificity for detection of Complement C4-B (C4B).
No significant cross-reactivity or interference between Complement C4-B (C4B) and analogues was observed.


Matrices listed below were spiked with certain level of recombinant Complement C4-B (C4B) and the recovery rates were calculated by comparing the measured value to the expected amount of Complement C4-B (C4B) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 90-97 93
EDTA plasma(n=5) 80-89 83
heparin plasma(n=5) 90-99 96


Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Complement C4-B (C4B) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Complement C4-B (C4B) were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV<10%
Inter-Assay: CV<12%


The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Complement C4-B (C4B) and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.

Sample 1:2 1:4 1:8 1:16
serum(n=5) 88-99% 93-101% 95-104% 84-99%
EDTA plasma(n=5) 86-102% 88-105% 98-105% 90-105%
heparin plasma(n=5) 91-98% 96-103% 86-104% 97-105%


The stability of kit is determined by the loss rate of activity. The loss rate of this kit is less than 5% within the expiration date under appropriate storage condition.
To minimize extra influence on the performance, operation procedures and lab conditions, especially room temperature, air humidity, incubator temperature should be strictly controlled. It is also strongly suggested that the whole assay is performed by the same operator from the beginning to the end.

Reagents and materials provided

Reagents Quantity Reagents Quantity
Pre-coated, ready to use 96-well strip plate 1 Plate sealer for 96 wells 4
Standard 2 Standard Diluent 1×20mL
Detection Reagent A 1×120µL Assay Diluent A 1×12mL
Detection Reagent B 1×120µL Assay Diluent B 1×12mL
TMB Substrate 1×9mL Stop Solution 1×6mL
Wash Buffer (30 × concentrate) 1×20mL Instruction manual 1

Assay procedure summary

1. Prepare all reagents, samples and standards;
2. Add 100µL standard or sample to each well. Incubate 1 hours at 37°C;
3. Aspirate and add 100µL prepared Detection Reagent A. Incubate 1 hour at 37°C;
4. Aspirate and wash 3 times;
5. Add 100µL prepared Detection Reagent B. Incubate 30 minutes at 37°C;
6. Aspirate and wash 5 times;
7. Add 90µL Substrate Solution. Incubate 10-20 minutes at 37°C;
8. Add 50µL Stop Solution. Read at 450nm immediately.



Catalog No. Related products for research use of Homo sapiens (Human) Organism species Applications (RESEARCH USE ONLY!)
RPB305Hu01 Recombinant Complement C4-B (C4B) Positive Control; Immunogen; SDS-PAGE; WB.
PAB305Hu01 Polyclonal Antibody to Complement C4-B (C4B) WB; IHC; ICC; IP.
MAB305Hu22 Monoclonal Antibody to Complement C4-B (C4B) WB; IHC; ICC; IP.
SEB305Hu ELISA Kit for Complement C4-B (C4B) Enzyme-linked immunosorbent assay for Antigen Detection.