Human Free IGF-I/IGF-1 ELISA Kit

Newer Version Available: DFG100B

Discontinued Product

DFG100 has been discontinued and is replaced by DFG100B.

Human Free IGF-I ELISA Standard Curve
2 Images
Product Details
Citations (3)

Human Free IGF-I/IGF-1 ELISA Kit Summary

Assay Type
Solid Phase Sandwich ELISA
96-well strip plate
Assay Length
1.75 hours
Sample Type & Volume Required Per Well
EDTA Plasma (50 uL)
0.015 ng/mL
Assay Range
0.1 - 6 ng/mL (EDTA Plasma)
Natural and recombinant human Free IGF-I
< 0.5% cross-reactivity observed with available related molecules.< 50% cross-species reactivity observed with species tested.
No significant interference observed with available related molecules.

Product Summary

The Free IGF-I enzyme linked immunosorbent assay (ELISA) is a 1.75 hour solid-phase ELISA designed to measure human Free IGF-I in EDTA Plasma. It contains E. coli-expressed recombinant human IGF-I and has been shown to accurately quantitate the recombinant factor.


Intra-Assay Precision (Precision within an assay) Three samples of known concentration were tested on one plate to assess intra-assay precision
Inter-Assay Precision (Precision between assays) Three samples of known concentration were tested in separate assays to assess inter-assay precision

EDTA Plasma

Intra-Assay Precision Inter-Assay Precision
Sample 1 2 3 1 2 3
n 8 8 8 8 8 8
Mean (pg/mL) 0.2 0.83 1.87 0.18 0.8 2.09
Standard Deviation 0.01 0.03 0.07 0.02 0.08 0.13
CV% 5 3.6 3.7 11.1 10 6.2


The recovery of samples spiked with IGF-I was evaluated.

Sample Type Average % Recovery Range %
EDTA Plasma (n=3) 107 93-118

Data Examples

Human Free IGF-I ELISA Standard Curve

Human Free IGF-I Standard Curve

Product Datasheets

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Preparation and Storage

Store the unopened product at 2 - 8 °C. Do not use past expiration date.

Background: IGF-I/IGF-1

Insulin-like growth factor (IGF)-I (also known as somatomedin C and somatomedin A) and IGF-II (multiplication stimulating activity or MSA) belong to the family of insulin-like growth factors that are structurally homologous to proinsulin. Mature IGF-I and IGF-II share approximately 70% sequence identity. Both IGF-I and IGF-II are expressed in many tissues and cell types and may have autocrine, paracrine and endocrine functions. Mature IGF-I and IGF-II are highly conserved between the human, bovine and porcine proteins (100% identity), and exhibit cross-species activity.

The IGFL (insulin-like growth factor-like) family includes four small (~11 kDa), probably secreted family members in humans and one in mouse. This family shares A and B chain cysteine motifs with the IGF superfamily, and has an additional cysteine motif within an uncleaved region corresponding to the C peptide of the IGF family.

Long Name:
Insulin-like Growth Factor I/Insulin-like Growth Factor 1
Entrez Gene IDs:
3479 (Human); 16000 (Mouse); 24482 (Rat)
Alternate Names:
IBP1; IGF1; IGF-1; IGF1A; IGFI; IGF-I; IGF-IA; IGF-IB; insulin-like growth factor 1 (somatomedin C); insulin-like growth factor 1; insulin-like growth factor I; insulin-like growth factor IA; insulin-like growth factor IB; Mechano growth factor; MGF; Somatomedin A; Somatomedin C; somatomedin-C

Assay Procedure

Refer to the product for complete assay procedure.

Bring all reagents and samples to room temperature before use. It is recommended that all samples, standards, and controls be assayed in duplicate.
  1.   Prepare all reagents, standard dilutions, and samples as directed in the product insert.
  2.   Remove excess microplate strips from the plate frame, return them to the foil pouch containing the desiccant pack, and reseal.

  3. 20 µL Biotinylated Antibody
  4.   Add 20 µL of Biotinylated Antibody to each well.

  5. 50 µL Standard, Control, or Sample
  6.   Add 50 µL of Standard, control, or sample to each well. Cover with a plate sealer, and incubate at room temperature for 1 hour on a horizontal orbital microplate shaker.
  7.   Aspirate each well and wash, repeating the process 4 times for a total of 5 washes.

  8. 100 µL Conjugate
  9.   Add 100 µL of Conjugate to each well. Cover with a new plate sealer, and incubate at room temperature for 30 minutes on the shaker.
  10.   Aspirate and wash 5 times.

  11. 100 µL Substrate Solution
  12.   Add 100 µL Substrate Solution to each well. Incubate at room temperature for 10 minutes on the shaker. PROTECT FROM LIGHT.

  13. 100 µL Stop Solution
  14.   Add 100 µL of Stop Solution to each well. Read at 450 nm within 30 minutes. Set wavelength correction to 540 nm or 570 nm.

Citations for Human Free IGF-I/IGF-1 ELISA Kit

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

3 Citations: Showing 1 - 3
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  1. Trio, a novel bovine high fecundity allele: III. Acquisition of dominance and ovulatory capacity at a smaller follicle size
    Authors: A García-Gue, AMO Canavessi, PLJM Jr, MA Mezera, R Sartori, BW Kirkpatric, MC Wiltbank
    Biol. Reprod., 2018;0(0):.
    Species: Bovine
    Sample Types: Follicular Fluid
  2. Detection of Placental Proteomes at Different Uterine Positions in Large White and Meishan Gilts on Gestational Day 90
    PLoS ONE, 2016;11(12):e0167799.
    Species: Porcine
    Sample Types: Serum
  3. IGFBP-2 inhibits adipogenesis and lipogenesis in human visceral, but not subcutaneous, adipocytes.
    Authors: Yau S, Russo V, Clarke I, Dunshea F, Werther G, Sabin M
    Int J Obes (Lond), 2015;39(5):770-81.
    Species: Human
    Sample Types: Cell Culture Supernates


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