Thyroxine (total T4) Human ELISA Kit
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1 ab Thyroxine (total T4) Human ELISA Kit Instructions for Use For the quantitative measurement of Thyroxine (total T4) in Human serum and plasma. This product is for research use only and is not intended for in vitro diagnostic use.
2 Table of Contents 1. Introduction 2 2. Assay Summary 4 3. Kit Contents 5 4. Storage and Handling 6 5. Additional Materials Required 6 6. Preparation of Reagents 6 7. Preparation and Collection of Specimen 8 8. Assay Method 8 9. Data Analysis Limitations Specificity Troubleshooting 16 1
3 1. Introduction ab Thyroxine (T4) Human ELISA Kit ab108686, Thyroxine (T4) Human ELISA Kit is intended for the quantitative determination of Thyroxine (total T4) in Human serum and plasma. The thyroid hormone, thyroxine (T4) is produced by the thyroid gland. An important component in the synthesis is iodine. The major form of thyroid hormone in the blood is thyroxine (T4). Thyroxine is converted to the active T3 (three to four times more potent than T4) within cells by deiodinases (5'-iodinase). Thyroxine-binding globulin (TGB) is the major carrier protein for circulating thyroid hormone. Only a very small fraction of the circulating hormone is free (unbound) - T4 0.03%. The thyronines act on the body to increase the basal metabolic rate, affect protein synthesis and increase the body's sensitivity to catecholamines (such as adrenaline) by permissiveness. The thyroid hormones are essential to proper development and differentiation of all cells of the Human body. These hormones also regulate protein, fat, and carbohydrate metabolism, affecting how Human cells use energetic compounds. Numerous physiological and pathological stimuli influence thyroid hormone synthesis. Thyrotoxicosis or hyperthyroidism is the clinical syndrome caused by an excess of 2
4 circulating free thyroxine, free triiodothyronine, or both. Both T3 and T4 are used to treat thyroid hormone deficiency (hypothyroidism). ab is based on the principle of a solid phase enzyme-linked immunosorbent assay. The assay system utilizes two antibodies directed against distinct antigenic determinants on the molecule. 3
5 2. Assay Summary Microtiter strip wells are precoated with anti-t4 antibodies (solidphase). 25 µl of Samples and Standards are added to the wells and immediately 100 µl of T4-HRP Conjugated antibody added.t4 in the sample competes with added horseradish peroxidase labelled T4 (enzyme-labelled antigen) for antibody binding. Incubated for 1 hour. Wells are washed and the immune complex formed by enzymelabelled antigen is visualized by adding Tetramethylbenzidine (TMB) substrate which gives a blue reaction product after incubation for 15 min. The intensity of this product is inversely proportional to the amount of T4 in the sample. Sulphuric acid is added to stop the reaction. This produces a yellow endpoint colour. Absorption at 450 nm is read using an ELISA microwell plate reader. 4
6 3. Kit Contents ab Thyroxine (T4) Human ELISA Kit Anti-T4 IgG Coated Wells: 12 breakapart 8-well snap-off strips coated with anti-t4 IgG; in resealable aluminium foil. Stop Solution: 1 bottle containing 15 ml sulphuric acid, 0.15 mol/l (avoid any skin contact). T4-HRP Conjugate conc.: 1 bottle containing 1.4 ml of concentrated horseradish peroxidase labelled T4. Conjugate Buffer: 1 bottle containing 12.5 ml red buffer and binding protein inhibitors. Wash Solution 50x conc.: 1 bottle containing 20 ml (NaCl 45 g/l, Tween20 55 g/l) TMB Substrate Solution: 1 bottle containing 15 ml 3, 3, 5, 5 tetramethylbenzidine (H 2 O 2 -TMB 0.26 g/l) (avoid any skin contact). T4 Standards: 6 bottles, 1 ml each Standard 0: µg/ml Standard 1: µg/ml Standard 2: µg/ml Standard 3: µg/ml Standard 4: µg/ml Standard 5: µg/ml Exact levels are given on the labels on a lot specific basis. Strip holder: 1 Cover foils: 1 5
7 4. Storage and Handling The reagents are stable up to the expiry date stated on the label when stored at 2-8 C in the dark. Opened reagents are stable for 60 days when stored at 2-8 C. 5. Additional Materials Required Distilled or deionized water Precision pipettes: 5 µl, 10 µl, 50 µl, 100 µl and 1.0 ml Disposable pipette tips Microtiter well reader capable of reading absorbance at 450 nm. Manual or automatic equipment for rinsing wells Disposable tubes Timer Vortex mixer, or equivalent 6. Preparation of Reagents 1. All reagents should be allowed to reach room temperature (22-28 C) before use. 2. Coated snap-off Strips: The ready to use break apart snap-off strips are coated with anti-t4 IgG antibodies. Store at 2-8 C. 6
8 Open the bag only when it is at room temperature. Immediately after removal of strips, the remaining strips should be resealed in the aluminium foil along with the desiccant supplied and stored at 2-8 C; stability until expiry date. Do not remove the adhesive sheets on the unused strips. 3. T4-HRP Conjugate: Dilute the T4 conjugate 1:11 with Conjugate Buffer in a suitable container. This reagent should be used within 24 hours for maximum performance of the assay. Store at 2-8 C 4. Wash Solution: Dilute concentrated Wash Solution to 1000 ml with distilled or deionised water in a suitable storage container. For smaller volumes respect the 1:50 ratio. The diluted wash solution is stable for 30 days at 2-8 C. 5. TMB Substrate Solution: The bottle contains 15 ml of a tetramethylbenzidine/hydrogen peroxide system. The reagent is ready to use and has to be stored at 2-8 C in the dark. Avoid the exposure of TMB substrate to direct sunlight, metal or oxidants The solution should be colourless or could have a slight blue tinge. If the substrate turns into blue, it may have become contaminated and should be thrown away. 6. T4 Standards and Stop Solution: Supplied ready to use store at 2-8 C. 7
9 7. Preparation and Collection of Specimen 1. Collect sample(s) by venipuncture in 10 ml silicone evacuated tube(s). The usual precautions in the collection of venipuncture samples should be observed. Separate the red blood cells by centrifugation. 2. Use serum or plasma for the T4 procedure. Specimen(s) may be refrigerated at 2-8 C (for a maximum period of 48 hours). If the specimen(s) cannot be assayed within 48 hours, the sample(s) may be stored at temperatures of 20 C for up to 30 days. When assayed in duplicate, 0.10ml of the specimen is required. 3. Further information see Limitations section page Assay Method Test Preparation: Please read the test protocol carefully before performing the assay. Result reliability depends on strict adherence to the test protocol as described. Prior to commencing the assay, the distribution and identification plan for all specimens and standards should be carefully established. Please allocate at least: 8
10 1 well (e.g. A1) for blank 2 wells (e.g. B1+C1) for standard 0 2 wells (e.g. D1+E1) for standard 1 2 wells (e.g. F1+G1) for standard 2 2 wells (e.g. H1+A2) for standard 3 2 wells (e.g. B2+C2) for standard 4 2 wells (e.g. D2+E2) for standard 5 It is recommended to determine standards and patient samples in duplicate. Pipetting of samples should not extend beyond ten minutes to avoid assay drift. If more than one plate is used, it is recommended to repeat the dose response curve. Perform all assay steps in the order given and without any appreciable delays between the steps. A clean, disposable tip should be used for dispensing each standard and each patient sample Assay Procedure: 1. Select the required number of microtiter strips or wells and insert them into the holder 2. Dispense 25 µl standards and samples into their respective wells. Leave well A1 for substrate blank. 3. Add 100 µl diluted T4-HRP Conjugate to each well except blank. 9
11 4. Incubate for 1 hour at room temperature (22-28 C). 5. When incubation has been completed, remove the foil, aspirate the content of the wells and wash each well three times with 300 µl diluted Wash Solution. Avoid overflows from the reaction wells. The soak time between each wash cycle should be >5sec. At the end carefully remove remaining fluid by tapping strips on tissue paper prior to the next step! Note: Washing is critical! Insufficient washing results in poor precision and falsely elevated absorbance values. 6. Dispense 100 µl TMB Substrate Solution into all wells. 7. Incubate for exactly 15 min at room temperature (22-28 C) in the dark. 8. Dispense 100 µl Stop Solution into all wells in the same order and at the same rate as for the TMB Substrate Solution. Any blue colour developed during the incubation turns into yellow. 9. Measure the absorbance of the specimen at 450 nm within 30 min after addition of the Stop Solution. Measurement: Adjust the ELISA Microwell Plate Reader to zero using the standard 0. Measure the absorbance of all wells at 450 nm and record the absorbance values for each standard and patient sample in the distribution and identification plan. 10
12 Dual wavelength reading using 620 nm as reference wavelength is recommended. Where applicable calculate the mean absorbance values of all duplicates. Quality Control: Each laboratory should assay controls at levels in the hypothyroid, euthyroid and hyperthyroid range for monitoring assay performance. These controls should be treated as unknowns and values determined in every test procedure performed. Quality control charts should be maintained to follow the performance of the supplied reagents. Pertinent statistical methods should be employed to ascertain trends. The individual laboratory should set acceptable assay performance limits. Other parameters that should be monitored include the 80, 50 and 20% intercepts of the standard curve for run-to-run reproducibility. In addition, maximum absorbance should be consistent with past experience. Significant deviation from established performance can indicate unnoticed change in experimental conditions or degradation of kit reagents. Fresh reagents should be used to determine the reason for the variations. If computer controlled data reduction is used to calculate the results of the test, it is imperative that the predicted values for the calibrators fall within 10% of the assigned concentrations. 11
13 9. Data Analysis Note- Maximum absorbance of standard 0 > Calculate the mean absorbance for each point of the standard curve and each sample. 2. Plot the mean value of absorbance of the standards against concentration. Draw the best-fit curve through the plotted points. (es.: Four Parameter Logistic). 3. Interpolate the values of the samples on the standard curve to obtain the corresponding values of the concentrations expressed in µg/ml. A. Reference Values A study of euthyroid adult population was undertaken to determine expected values for the T4 EIA Test System. Mean (µg/ml) SD Range (µg/ml) Value B. Precision Intra-assay variation- Within run variation was determined by replicate determination (20x) of three different control sera in one assay. The within assay variability is 8.16%. 12
14 Inter-assay variation- Between run variation was determined by replicate measurements (10x) of three different control sera in different lots. The between assay variability is 8.42 %. C. Sensitivity The lowest detectable concentration of T4 that can be distinguished from the standard 0 is µg/ml at the 95 % confidence limit. D. Accuracy The recovery of µg/l T4 added to a sample gave an average value (±SE) of 97.8% ± 5 % with reference to the original concentrations. 10. Limitations The concentration of total thyroxine in serum depends on several factors: the function of the thyroid gland and its regulation, thyroxine binding globulin (TBG) and thyroxine 13
15 binding to TBG. However, the concentration of total thyroxine alone is not sufficient to monitor the clinical status. Total serum thyroxine values may increase during pregnancy or administration of oral contraceptives. The table of drugs and interfering conditions in which the values of total thyroxine are affected have been compiled by the Journal of the American Association of Clinical Chemists. Not intended for newborn screening It is important that the time of reaction in each well is held constant for reproducible results. Pipetting of samples should not extend beyond ten minutes to avoid assay drift. If more than one plate is used, it is recommended to repeat the dose response curve. Addition of the substrate solution initiates a kinetic reaction, which is terminated by the addition of the stop solution. Therefore, the addition of the substrate and the stopping solution should be added in the same sequence to eliminate any time deviation during reaction. Plate readers measure vertically. Do not touch the bottom of the wells. Failure to remove adhering solution adequately in the aspiration or decantation wash step(s) may result in poor replication and spurious results. 14
16 11. Specificity ab Thyroxine (T4) Human ELISA Kit The cross reactivity of the thyroxine antibody to selected substances was evaluated by adding the interfering substance to a serum matrix at various concentrations. The cross reactivity was calculated by deriving a ratio between doses of interfering substance to dose of thyroxine needed to displace the same amount of tracer. Substance Cross Reactivity Concentration I-Thyroxine d-thyroxine < µg/ml TryIodothyronine < µg/ml d-tryiodothyronine < µg/ml Iodothyrosine < µg/ml TriIodotetraacetic acid < µg/ml Di-Iodotetraacetic acid < µg/ml 15
17 12. Troubleshooting Problem Cause Solution Poor standard curve Improper standard dilution Standard improperly reconstituted (if applicable) Standard degraded Curve doesn't fit scale Confirm dilutions made correctly Briefly spin vial before opening; thoroughly resuspend powder (if applicable) Store sample as recommended Try plotting using different scale Low signal Incubation time too short Try overnight incubation at 4 C Target present below detection limits of assay Precipitate can form in wells upon substrate addition when concentration of target is too high Using incompatible sample type (e.g. serum vs. cell extract) Sample prepared incorrectly Decrease dilution factor; concentrate samples Increase dilution factor of sample Detection may be reduced or absent in untested sample types Ensure proper sample preparation/dilution Large CV Bubbles in wells Ensure no bubbles present prior to reading plate 16
18 High background Low sensitivity All wells not washed equally/thoroughly Incomplete reagent mixing Inconsistent pipetting Inconsistent sample preparation or storage Wells are insufficiently washed Contaminated wash buffer Waiting too long to read plate after adding STOP solution Improper storage of ELISA kit Using incompatible sample type (e.g. Serum vs. cell extract) Check that all ports of plate washer are unobstructed/wash wells as recommended Ensure all reagents/master mixes are mixed thoroughly Use calibrated pipettes and ensure accurate pipetting Ensure consistent sample preparation & optimal sample storage conditions (eg. minimize freeze/thaws cycles) Wash wells as per protocol recommendations Make fresh wash buffer Read plate immediately after adding STOP solution Store all reagents as recommended. Please note all reagents may not have identical storage requirements. Detection may be reduced or absent in untested sample types For further technical questions please do not hesitate to contact us by or phone (select contact us on for the phone number for your region). 17
19 18
20 Abcam in the USA Abcam in Japan Abcam Inc Abcam KK 1 Kendall Square, Ste B Nihonbashi Cambridge, Kakigaracho, MA Chuo-ku, Tokyo USA Japan Toll free: ABCAM (22226) Fax: Tel: +81-(0) Fax: +81-(0) Abcam in Europe Abcam in Hong Kong Abcam plc Abcam (Hong Kong) Ltd 330 Cambridge Science Park Unit 225A & 225B, 2/F Cambridge Core Building 2 CB4 0FL 1 Science Park West Avenue UK Hong Kong Science Park Hong Kong Tel: +44 (0) Fax: +44 (0) Tel: (852) Fax: (852) Copyright 2011 Abcam, All Rights Reserved. The Abcam logo is a registered trademark. All information / detail is correct at time of going to print.
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