The Microwell Estradiol ELISA TEST is an enzyme immunoassay system for quantitative determination of 17beta Estradiol levels in
bovine and related species serum. The test is intended for professional use as research tool in monitoring of conditions related to serum/
plasma levels of Estradiol. The test kit has been designed to be used by a trained, skilled laboratory professional only.
The E2 quantitative test is based on a solid-phase enzyme immunoassay based on competitive binding method. A sample (serum/ plasma/
urine) containing an unknown amount of E2 to be assayed (unlabeled antigen) is added to a standard amount of a conjugated E2 (labeled
antigen). The labeled and unlabeled antigens are then allowed to compete for high affinity binding sites of E2 antibody on a coated
plate. After washing away the free antigen, the amount of labeled antigen in the sample is reversibly proportional to the concentration
of the unlabeled antigen. The actual concentrations in unknown samples are obtained by means of a standard curve based on known
concentrations of unlabeled antigen analyzed in parallel with the unknowns. After washing, substrate solution is added and the enzyme
is allowed to react for a fixed time before the reaction is terminated. Absorbencies are measured at 450 nm using ELISA plate reader. A
standard curve is produced using values from 5 standards from which absorbency values for blank tubes have been subtracted. Results
for unknown may be read directly from this standard curve using either manual calculation or by a suitable computer program. This kit is
suitable for the direct measurement of E2 in serum samples
Materials Provided
Microtiter wells 96, coated with second antibody.
3. TMB Color Reagent, 12 mL4. Stopping Solution (2N HCL), 6mL1.
7. E2 Standard Set: 0, 10, 25, 100, 500 and 2500, 10,000 pg/ml/ 0.5ml/Vial 8. Quality control set QC1, (~100pg/mL) and QC2, (~500 pg/mL)9.
Materials Required But Not Provided

This kit contains reagents manufactured from blood products and samples should be considered potentially infectious and handling should be in accordance with the procedures defined by an appropriate biohazard safety guideline or regulations in your lab, local and state. The contents of this kit, and their residues, must not come into contact with ruminating animals or swine or other animals.
Avoid contact with the Stopping Reagent. It may cause skin irritation and burns.
Do not use reagents after expiration date.
Do not mix or use components from the kits with different lot numbers.
Replace caps on reagents immediately. Do not switch caps.
Reagents contain sodium azide (NaN3) as a preservative. On disposal, flush with a large volume of water to prevent azide build-up.
Do not use reagents from other kits or mix with other manufactured test kits.
Store the kit at 4-8 C upon receipt and when it is not in use. Do not Freeze.
Keep microtiter wells in a sealed bag with desiccants to minimize exposure to damp air.
Allow all the reagents to reach to room temperature before setting up the assay.
Remove only desired number of wells and seal the bag and store at 4-8 C as before.
Do not at any time mix or use components with other manufacturers kits. Do not use the kit components after expiration date and discard according to the state and local regulations.
A microtiter well reader with bandwidth of 10 nm or less and an optical density range of 0 to 3 OD or greater at 405 nm wavelength is
acceptable for use in absorbency measurement.
This kit is suitable for use with serum or plasma samples. The use of hemolytic or lipemic samples and samples with bilirubin will affect results and may interfere with the assay.
No special preparation of the samples is required. Avenous blood sample (enough to produce about 0.5 ml serum ) is collected aseptically.
If the sample is not tested immediately refrigerate at 4-8 C. If the storage period greater than 3 days are anticipated, the specimen should be frozen and repeated thawing and freezing should be avoided.
If the sample is turbid or contain precipitate may give false results. Such samples should be centrifuged before use.
Prepare wash buffer by diluting 1 part with 19 parts of distilled water, excess amount may be stored at 2-8 C for couple of weeks.
All reagents should be allowed to reach room temperature (18-25C) before use.
Pipette 50 ul of standards, samples, and QC controls into appropriate wells.
Add 100 ul of E2 Enzyme Conjugate Solution to each well (except those set for blanks), Discard the contents of the wells and wash the plate 5 times with Wash Solution (250-300ul) per well. Invert plate, tap firmly against absorbent paper to remove any residual moisture.
Add 100 ul TMB Substrate solutions into each well (including the blanks). Remember for pipetting order.
Incubate the plate for 20 minutes at room temperature. Stop reaction by adding 50ul of Stopping Solution and gently mixed. Read the absorbance at 450 nm with a microwell reader.
NOTE: The substrate incubation should be carried out within the temperature range 20-25C. For temperature outside this range, the
duration of the incubation should be adjusted.
Calculate the mean absorbance values (A) for each set of reference standards, controls, samples and blanks.
Subtract the value for blanks from those for standards, control and unknown samples.
Calculate the B/B)% values by dividing each value by the value for the zero-standard.
For the standards, plot a graph on semi-log graph paper with B/BO% values on the ordinate and the E2 concentrations (pg/mL) on the abscissa.
Using the graph read off the E2 concentrations for the unknown samples.
The values above the readable and below the readable range should be repeated using appropriate dilution.
The sensitivity of the assay is 5pg/mL and each laboratory should establish its own normal range based on the number of samples and
for each species. A Good Laboratory Practice requires that quality control specimens be run with each standard curve to establish assay
performance characteristics such as recovery, linearity, precision and specificity. The average recovery in this assay is in the range of
99.6% the recovery in the linearity range is about 98.5% and the linear range of the assay is 0-1000pg/mL. The intra-assay variation 10.5%
and inter assay variation is about 8.5%
Specificity: The specificity was assessed by determining the crossreactivity of several known steroids (at 100ng/mL) in the assay and
found no reactivity,
The E2 ELISA system designed here is for estimation of E2 levels in rodent samples by a laboratory professional only. 2. The wells should be adequately washed to obtain reproducible results. The washing step is extremely important and should be followed according to the instructions.
The assay should be analyzed under GLP and GMP conditions where ever applicable.
Webster J., 1987 understanding the dairy cow. BSP professional Books. Oxford p64-68, 300-321, and 343-344.
Robinson T.J. 1977 Reproduction in cattle "In reproduction in Domestic animals" 3rd ed.HH.Cole & PT Cupps editors, p439-442 Bulman DC.& Lamming GE. 1978 Milk progesterone levels interrelation to conception, repeat breeding and factors influencing acyclicity in dairy cows. J Reprod Fertil.54, 447-458 Ruiz FJ et al. 1992 Cost benefit evaluation of on-farm milk progesterone testing to monitor return to cyclicity and to classify ovarian cysts. J Dairy Sci 1992 75(4), 1036-1043 Autrere MB and Benson H 1976 Progesterone: an overview and recent advances Jour Par Sci 65, (6)783-800 Chattoraj SC 1976 Endocrine function in Fundamentals of Clinical Chemistry, NW Tietz eds.,WB Saunders, Chap 13, 699-823 Bovine ESTRADIOL ELISA Test
Product Profile and Instructions

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