CLIA Kit for Fibroblast Growth Factor 21 (FGF21)

Specificity

This assay has high sensitivity and excellent specificity for detection of Fibroblast Growth Factor 21 (FGF21).
No significant cross-reactivity or interference between Fibroblast Growth Factor 21 (FGF21) and analogues was observed.

Recovery

Matrices listed below were spiked with certain level of recombinant Fibroblast Growth Factor 21 (FGF21) and the recovery rates were calculated by comparing the measured value to the expected amount of Fibroblast Growth Factor 21 (FGF21) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 99-105 102
EDTA plasma(n=5) 95-104 101
heparin plasma(n=5) 91-98 94

Precision

Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Fibroblast Growth Factor 21 (FGF21) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Fibroblast Growth Factor 21 (FGF21) were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV<10%
Inter-Assay: CV<12%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Fibroblast Growth Factor 21 (FGF21) 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) 94-102% 79-94% 78-95% 80-88%
EDTA plasma(n=5) 89-101% 80-102% 78-104% 79-99%
heparin plasma(n=5) 97-105% 98-105% 79-89% 83-105%

Stability

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 Assay Diluent A 1×12mL
Detection Reagent B 1×260µL Assay Diluent B 1×12mL
Reagent Diluent 1×300µL Substrate B 1×2mL
Substrate A 1×10mL Instruction manual 1
Wash Buffer (30 × concentrate) 1×20mL

Assay procedure summary

1. Prepare all reagents, samples and standards;
2. Add 50µL standard or sample to each well.
    And then add 50µL prepared Detection Reagent A immediately.
    Shake and mix. Incubate 1 hour at 37°C;
3. Aspirate and wash 3 times;
4. Add 100µL prepared Detection Reagent B. Incubate 30 minutes at 37°C;
5. Aspirate and wash 5 times;
6. Add 100µL Substrate Solution. Incubate 10 minutes at 37°C;
7. Read RLU value immediately.

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Magazine Citations
Lipids in Health and Disease Dietary moderately oxidized oil induces expression of fibroblast growth factor 21 in the liver of pigs Lipidworld: source
Endocrinology Orphan nuclear receptor Nur77 mediates fasting-induced hepatic fibroblast growth factor 21 expression Endocrine:Source
Biochemical and Biophysical Research Communications Alpha lipoic acid induces hepatic fibroblast growth factor 21 expression via up-regulation of CREBH Pubmed:25449271
Free Radic Biol Med Skeletal muscle increases FGF21 expression in mitochondrial disorders to compensate for energy metabolic insufficiency by activating the mTOR–YY1–PGC1α pathway PubMed: 25843656
Journal of diabetes and its complications Associations between FGF21, osteonectin and bone turnover markers in type 2 diabetic patients with albuminuria. pubmed:27916484
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