Human Free IGF-I ELISA Kit

  • Assay Type
    Solid Phase Sandwich ELISA
  • Format
    96-well strip plate
  • Assay Length
    1.75 hours
  • Sample Type & Volume Required Per Well
    EDTA Plasma (50 uL)
  • Sensitivity
    0.015 ng/mL
  • Assay Range
    0.1 - 6 ng/mL (EDTA Plasma)
  • Specificity
    Natural and recombinant human Free IGF-I
  • Cross-reactivity
    < 0.5% cross-reactivity observed with available related molecules.< 50% cross-species reactivity observed with species tested.
  • Interference
    No significant interference observed with available related molecules.
Control Available
QC22, Quantikine Immunoassay Control Group 7 - Please Inquire
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
Standard Deviation0.


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

Sample Type Average % Recovery Range %
EDTA Plasma (n=3) 107 93-118
Preparation and Storage
  • Storage
    Store the unopened product at 2 - 8 °C. Do not use past expiration date.
Background: IGF-I

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
    • 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;
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    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.
    ELISA Controls
    Description Application Cat# Citations Images  

    Quantikine Immunoassay Control Group 7

    Ctrl QC22
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    Supplemental ELISA Products
    Description Application Cat# Citations Images  

    ELISA Plate Sealers, 100 Pack

    ELISA DY992
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