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Home ProductsELISA Kit Tests

Free Thyroxine(FT4) Elisa Kit for Diagnostic Use

Free Thyroxine(FT4) Elisa Kit for Diagnostic Use

Free Thyroxine(FT4) Elisa Kit for Diagnostic Use
Free Thyroxine(FT4) Elisa Kit for Diagnostic Use

Large Image :  Free Thyroxine(FT4) Elisa Kit for Diagnostic Use Get Best Price

Product Details:
Place of Origin: CHINA
Brand Name: SPAN
Certification: FT4
Model Number: FT4
Payment & Shipping Terms:
Minimum Order Quantity: 1 KIT
Price: U$40/Kit
Packaging Details: 96T/KIT
Delivery Time: within 3-8 working days(depends on your quantity)
Payment Terms: T/T, Western Union,Paypal
Supply Ability: FT4
Detailed Product Description

Free Thyroxine(FT4) Elisa Kit for Diagnostic Use

Intended use
Immunoassay for the in vitro quantitative determination of free thyroxine in human serum.
Summary (1,2 3, 4)
The thyroid hormone thyroxine (T4) is physiologically part of the regulating circuit of the thyroid gland and has an effect on general metabolism. The major fraction of the total thyroxine is bound to transport proteins (TBG, prealbumin, and albumin). The free thyroxine (fT4) isthe physiologically active thyroxine component.
The determination of free thyroxine is an important element in clinicalroutine diagnostics. Free T4 is measured together with TSH whenthyroid function disorders are suspected. The determination of fT4 isalso suitable for monitoring thyrosuppressive therapy.
The determination of free T4 has the advantage of being independentof changes in the concentrations and binding properties of thebinding proteins; additional determination of a binding parameter(T-uptake, TBG) is therefore unnecessary.
Test principle
Competition principle. Total duration of assay:80 minutes.
• Sample, T4 derivant coated microwells and enzyme labeled Anti-T4 are combined.
• During the incubation, T4 derivant coated on microwells and FT4 present in the sample compete for binding to the enzyme labeled antibodies.
• After washing, a complex is generated between the solid phase and enzyme-linked antibodies by immunological reactions.
• Substrate solutionis then added and catalyzed by this complex, resulting in a chromogenic reaction. The resulting chromogenic reaction is measured as absorbance.
• The color intensity is inversely proportional to the amount of FT4 in the sample.
Materials provided
• Coated Microplate, 8 x 12 strips, 96 wells, pre-coated with T3 derivant.
• Calibrators, 6 vials, 1 ml each, ready to use; Concentrations: 0(A), 5(B), 10(C), 20(D), 50(E) and 100(F) pmol/L.
• Enzyme Conjugate, 1 vial, 6.0 ml of HRP(horseradish peroxidase) labeled mouse monoclonal Anti-T4 in Tris-NaCl buffer containing BSA (bovine serum albumin). Contains 0.2% ProClin300Free Thyroxine(FT4) Elisa Kit for Diagnostic Use 0 preservative.
• Substrate, 1 vial, 11ml, ready to use, (tetramethylbenzidine) TMB.
• Stop Solution, 1 vial, 6.0 ml of 1 mol/l sulfuric acid.
• Wash Solution Concentrate, 1 vial, 25 ml (40X concentrated), PBS-Tween wash solution.
• IFU, 1 copy.
• Plate Lid: 1 piece.
Materials required (but not provided)
• Microplate reader with 450nm and 620nm wavelength absorbent capability.
• Microplate washer.
• Incubator.
• Plate shaker.
• Micropipettes and multichannel micropipettes delivering 50μl with a precision of better than 1.5%.
• Absorbent paper.
• Distilled water
Precautions and warnings
• For in vitro diagnostic use only. For professional use only.
• All products that contain human serum or plasma have been found to be non-reactive for HBsAg, HCV and HIVI/II. But all products should be reared as potential biohazards in use and for disposal.
• Mix the sample in the wells thoroughly by shaking and eliminate the bubbles.
• Conduct the assay away from bad ambient conditions. e.g. ambient air containing high concentration corrosive gas such as sodium hypochlorite acid, alkaline, acetaldehyde and so on, or containing dust.
• Wash the wells completely. Each well must be fully injected with wash solution. The strength of injection, however, is not supposed to be too intense to avoid overflow. In each wash cycle, dry the liquids in each well. Strike the microplate onto absorbent paper to remove residual water droplets. It is recommended to wash the microplate with an automated microplate strip washer.
• Failure to remove adhering solution adequately in the aspiration or decantation wash step(s) may result in poor replication and spurious results.
• Do not use reagents beyond the labeled expiry date.
• Do not mix or use components from kits with different batch codes.
• If more than one plate is used, it is recommended to repeat the calibration curve.
• It is important that the time of reaction in each well is held constant to achieve reproducible results.
• Ensure that the bottom of the plate is clean and dry.
• Ensure that no bubbles are present on the surface of the liquid before reading the plate.
• Thesubstrate and stop solution should be added in the same sequence to eliminate any time deviation during reaction.
• Store at 2-8℃.
• Place unused wells in the zip-lock aluminum foiled pouch and return to 2-8 °C, under which conditions the wells will remain stable for 2 months, or until the labeled expiry date, whichever is earlier.
• Seal and return unused calibrators to 2-8 °C, under which conditions the stability will be retained for 1 month, for longer use, store opened calibrators in aliquots and freeze at -20 °C. Avoid multiple freeze-thaw cycles.
• Seal and return all the other unused reagents to 2-8 °C, under which conditions the stability will be retained for 2 months, or until the labeled expiry date, whichever is earlier.
Specimen collection and preparation
• Collect serum samples in accordance with correct medical practices.
• Cap and store the samples at 18-25 °C for no more than 8 hours. Stable for 3 days at 2-8 °C, and 1 month at -20 °C. Recovery within 90-110 % of serum value or slope 0.9-1.1. Freeze only once.
• The sample types listed were tested with a selection of sample collection tubes that were commercially available at the time of testing, i.e. not all available tubes of all manufacturers were tested. Sample collection systems from various manufacturers may contain differing materials which could affectthe test results in some cases. When processing samples in primary tubes (sample collection systems), follow the instructions of the tube manufacturer. Centrifuge samples containing precipitates before performing theassay. Do not
• use heat-inactivated samples. Do not use samplesand controls stabilized with azide.
• Ensure the patients’ samples, calibrators, and controls are at ambient temperature (18-25 °C) before measurement.
• Sediments and suspended solids in samples may interfere with the test result which should be removed by centrifugation. Ensure that complete clot formation in serum samples has taken place prior to centrifugation. Some samples, especially those from patients receiving anticoagulant or thrombolytic therapy, may exhibit increased clotting time. If the sample is centrifuged before a complete clot forms, the presence of fibrin may cause erroneous results. Be sure that the samples are not decayed prior to use.
• Avoid grossly hemolytic, lipemic or turbid samples.
• Note that interfering levels of fibrin may be present in samples that do not have obvious or visible particulate matter.
• If proper sample collection and preparation cannot be verified, or if samples have been disrupted due to transportation or sample handling, an additional centrifugation step is recommended. Centrifugation conditions should be sufficient to remove particulate matter.
• Ensure the patients’ samples, calibrators, and controls are at ambient temperature (18-25 °C) before measurement. Mix all reagents through gently inverting prior to use.
• Adjust the incubator to 37 °C.
• Prepare wash solution concentrate before measurement. Stable for 2 months at ambient temperature.
• Don’s use Substrate if it looks blue.
• Don’t use reagents that are contaminated or have bacteria growth.


Rebecca Yan
Int'l Business Manager
Span Biotech Ltd.
Tel: +86(755)89589611
WhatsAPP:+8618823462100 (Wechat)



Contact Details

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Tel: +86-755-89589611

Fax: 86-755-89580096

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