Total Bilirubin (T-BIL) Assay Kit – Bulk Reagents


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Selling unit: per 100ml

Product Name

Common name: Total bilirubin (T-BIL) assay kit (chemical oxidation method)

English name: T-BIL Reagent Kit (Chemical Oxidation Method)

Intended Use

This kit is used for the in vitro quantitative determination of T-BIL concentration in human serum and plasma.

Bilirubin is a degradation product of hemoglobin. increased T-BIL is clinically manifested by jaundice. Massive destruction of red blood cells, biliary obstruction, and liver disease can all lead to increased bilirubin in the blood and cause jaundice.

Test Principle

When the PH value is close to 3, T-BIL is oxidized to bilirubin in the presence of oxidizing agent and surfactant. At this time, the characteristic yellow color of bilirubin is reduced, and the concentration of T-BIL in the sample can be found by measuring the difference in absorbance at 450 (450-470) nm before and after the action of the oxidant.

Main Components

Reagent components included in the product.

Total Bilirubin (T-BIL) Assay Kit

*Components are not interchangeable in kits with different lot numbers.

*Reagent components not included in the product, but necessary for the test: outsourced normal and abnormal QCs and calibrators.

Storage Conditions And Expiration Date

The kit is stored at 2-8°C away from light and is valid for one year.

Reagents that have been opened are taken care not to be contaminated and the reagents are stabilized in the instrument compartment (2-8°C) for one month.

The reagents must not be frozen.

Applicable Instruments

Hitachi 7180/7600; Olympus AU680/2700; Toshiba TBA120; Myriad BS2000M/480; Siemens ADVIA 1800/2400 series automatic biochemical analyzers.

Sample Request

Serum or EDTA anticoagulated plasma, measured within 2h after sample collection, stored airtight and protected from light, samples can be stored at 2~8℃ for 12h and -20℃ for 3 months.

Test Method

  1. Reagent preparation: liquid reagents are ready to use out of the bottle.
  2. test conditions: (different test instruments can be requested according to the different parameters on the machine)

Total Bilirubin (T-BIL) Assay Kit

Operation steps.

Total Bilirubin (T-BIL) Assay Kit

Reagents and sample volumes can be increased or decreased in proportion to the requirements of different biochemical analyzers.

  1. Calibration procedure.

The Randox calibration serum is recommended and the method of choice for the Randox calibration serum is choline oxide (vanadate method).

  1. QC control procedures.

It is recommended that each laboratory establish its own quality control system and select appropriate quality control products for quality control. The measured values of QC products should be within the specified range. If outside the specified range, it is necessary to take appropriate measures or contact the manufacturer.

  1. Calculation.

T-BIL content in samples (μmol/L) =(ΔAsample – ΔAblank ) × Cstandard / (ΔAstandard – ΔAblank )

Positive Judgment Value Or Reference Interval

2.0~20.1 μmol/L

It is recommended that each laboratory establish its own reference range of normal values.

Interpretation Of Test Results

The measurement of T-BIL in human serum and plasma is only one of the indicators used by clinicians to diagnose patients. Clinicians must also make a comprehensive judgment based on the patient’s physical symptoms, medical history, and other diagnostic items and diagnostic tools.

Limitations Of The Test Method

Hemoglobin ≤ 300 mg/dL, ascorbic acid ≤ 30 mg/dL, celiac disease ≤ 500 mg/dL did not interfere with the determination.

Product Performance Index

Absorbance of reagent blank: wavelength 450 nm, optical diameter 1.0 cm, temperature 37°C, A0  ≤ 0.4.

Analytical sensitivity: the kit tests 20 μmol/L of the test substance, the absorbance change value ΔA ≥ 0.01.

Linearity interval: for the tested serum samples, the linearity of the reagent should be within the interval of 2.0~650.0 μmol/L, and the linear correlation coefficient|r| should not be less than 0.990; within the interval of 2.0~100.0 μmol/L, the absolute deviation of linearity should not exceed 10 μmol/L; within the interval of (100.0~650.0 μmol/L, the relative deviation of linearity should not exceed ±10%.

Precision: repeatability CV ≤ 5%; relative extreme difference between batches ≤ 6%.

Accuracy: Relative deviation ≤ 10%.


  1. 1. This product is for in vitro diagnosis only.
  2. 2. Avoid contamination when using the reagent, the container used must be clean, and please take necessary precautions, do not swallow, and avoid contact with skin and mucous membrane.
  3. 3. Please dispose of the measured samples and waste liquids in accordance with the relevant national and local laws and regulations.
  4. 4. Do not mix R1 and R2 into a single reagent.
  5. 5. When changing the reagent lot number, please recalibrate.


  1. Tokuta. K and Tanimoto. K, Jpn. J. Clin. Chem., 22 (2), 116-112 (1993).
  2. Akiyama, K And Makino, I. Rinshoh-i. 19 (suppl), 242-244 (1993).
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