ELISA Kit for Complement Receptor 1, Erythrocyte (CR1)

CD35; C3BR; KN; C3b/C4b Receptor,Including Knops Blood Group System; Immune Adherence Receptor


This assay has high sensitivity and excellent specificity for detection of Complement Receptor 1, Erythrocyte (CR1).
No significant cross-reactivity or interference between Complement Receptor 1, Erythrocyte (CR1) and analogues was observed.


Matrices listed below were spiked with certain level of recombinant Complement Receptor 1, Erythrocyte (CR1) and the recovery rates were calculated by comparing the measured value to the expected amount of Complement Receptor 1, Erythrocyte (CR1) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 98-105 102
EDTA plasma(n=5) 97-105 101
heparin plasma(n=5) 78-94 84


Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Complement Receptor 1, Erythrocyte (CR1) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Complement Receptor 1, Erythrocyte (CR1) 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 Receptor 1, Erythrocyte (CR1) 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) 82-96% 80-96% 78-104% 89-98%
EDTA plasma(n=5) 88-95% 98-105% 89-96% 86-99%
heparin plasma(n=5) 87-101% 85-101% 78-89% 89-101%


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.



Magazine Citations
Turkish Neurosurgery Ghrelin Alleviates Spinal Cord Injury in Rats Via Its Anti-inflammatory Effects JTN: 913
17 Complement Receptor 1 Gene Variants Are Associated with Erythrocyte Sedimentation Rate PubMed: 21700265
Journal of Neural Transmission Cerebrospinal fluid levels of complement proteins C3, C4 and CR1 in Alzheimer's disease PubMed: 22488444
Annals of Neurology  High complement levels in astrocyte‐derived exosomes of Alzheimer disease Pubmed:29406582
Scientific Reports Human complement receptor type 1 (CR1) protein levels and genetic variants in chronic Chagas Disease Pubmed:29323238
Alzheimers & Dementia Complement protein levels in plasma astrocyte-derived exosomes are abnormal in conversion from mild cognitive impairment to Alzheimer's disease …
FASEB JOURNAL Traumatic brain injury increases plasma astrocyte‐derived exosome levels of neurotoxic complement proteins Pubmed: 31916313
Frontiers in Immunology Hepatitis B Virus Infection Among Leprosy Patients: A Case for Polymorphisms Compromising Activation of the Lectin Pathway and Complement Receptors 33643280
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