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Biosystems Bilirubin Total And Direct  

Bilirubin is mainly formed from the heme portion of aged or damaged RBC’S. It then combines with albumin to form a complex which is not water soluble. This is referred to as indirect or unconjugated Bilirubin. In the liver this Bilirubin complex is combined with glucuronic acid into a water soluble conjugate. This is referred to as conjugated or direct Bilirubin. Elevated levels of bilirubin are found in liver diseases

(Hepatitis, cirrhosis), excessive hemolysis / destruction of RBC (hemolytic jaundice) obstruction of the biliary tract (obstructive jaundice) and in drug induced reactions. The differentiation between the direct and indirect bilirubin is important in diagnosing the cause of

hyperbilirubinemia.

METHOD PRINCIPLE

Bilirubin reacts with diazotized sulphanilic acid to form a coloured azobilirubin compound. The unconjugated bilirubin couples with the sulphanilic acid in the presence of caffein – benzoate accelerator. The intensity of the colour formed is directly proportional to the amount of bilirubin present in the sample.

Biosystems Bilirubin Total And Direct 

DMSO

Bilirubin + Diazotized Sulphanilic acid + Sodium Nitrite ………>

Azobilirubin Compound

DIRECT BILIRUBIN

Bilirubin + Diazotized Sulphanilic acid + Sodium Nitrite ………>

Azobilirubin Compound

REAGENTS

Biosystems Bilirubin Total And Direct 

	BILIRUBIN	BILIRUBIN
R1-Direct Reagent	1 x 50 ml	1 x 100 ml
R2-Direct Nitrite	1 vial	1 vial
R3-Total Reagent	1 x 50 ml	1 x 100 ml
R4-Total Nitrite	1 vial	1 vial

Working reagent preparation and stability

The reagents are stable at at R.T till expiry date printed on the package.

Concentrations in the test

TOTAL BILIRUBIN	DIRECT BILIRUBIN
Sulphanilic acid – 32 mmol/l	Sulphanilic acid	– 32 mmol/l
Conc. HCL      – 165 mmol/L	Conc. HCL	– 165 mmol/L
Sodium Nitrite    – 290 mmol/L	Sodium Nitrite	– 290 mmol/L
DMSO         –  7 mmol/L	DMSO	– NIL

Warnings and notes

Product for in vitro diagnostic use only.

Reagents are ready to use. Do not pipette with mouth

ADDITIONAL EQUIPMENT

• •        automatic analyzer or photometer able to read at 546 nm

• •        thermostat at 25°C or 37°C;

• •        general laboratory equipment;

• SPECIMEN

Serum. Bilirubin is reported to be stable in the sample for 4 days at 2-8^o C. protected from light as it is photosensitive.

PROCEDURE

These reagents may be used both for manual assay and in several automatic analysers.

Applications for them are available on request.

Manual procedure – Direct Bilirubin

Biosystems Bilirubin Total And Direct 

wavelength temperature cuvette Pipette into the cuvette:		546 nm 25°C/37°C 1 cm
	Addition Sequence	Blank (B)	Test (T)
	R1 Direct Reagent	1000 pl	1000 pl
	R2 Direct Nitrite	–	20 pl
	Sample	50 pl	50 pl

Mix well and incubate at R.T. for exactly 5 min. Measure absorbance of the Test Samples (Abs.T) immediately against their respective Blanks within 8 mins.

Manual procedure – Total Bilirubin

wavelength	546 nm
temperature	25°C/37°C
cuvette	1 cm

Pipette into the cuvette:

Addition Sequence	Blank (B)	Test (T)
R3 Total Reagent	1000 pl	1000 pl
R4 Total Nitrite	–	20 pl
Sample	50 pl	50 pl

Mix well and incubate at R.T. for exactly 5 min. Measure absorbance of the Test Samples (Abs.T) immediately against their respective Blanks within 8 mins.

Calculation

Total or Direct Bilirubin in mg/dl = (Abs.T – Abs.B) X 20.20 (Factor)

REFERENCE VALUES

Serum	value
Direct Bilirubin	upto 0.3 mg/dl
Total Bilirubin	upto 1.0 mg/dl

It is recommended for each laboratory to establish its own reference ranges for local population.

Biosystems Bilirubin Total And Direct 

QUALITY CONTROL

To ensure adequate quality control, each run should include assayed normal and abnormal controls. If commercial controls are not available it is recommended that known value samples be aliquoted, frozen and used as controls.

Bilirubin T&D (EP) page 1

PERFORMANCE CHARACTERISTICS

Linearity: The procedure is linear up to 20 mg/dl. If values exceed this limit, dilute the sample with distilled water and repeat the assay. Calculate the value using the proper dilution factor.

WASTE MANAGEMENT

Please refer to local legal requirements.

NOTE

1. In case of Cuvette Volume is more than 1.0 ml requisite volume of reagents and sample can be multiplied keeping reagent to sample ratio same.

2. Sequence of reagent addition should be followed strictly as per the procedure.

LITERATURE

Microcolumn chromatography is a diagnostic method based on the specific separation of certain components of a sample in order to identify and determine the amounts of the analytes, avoiding interference without extractions with organic reagents, or the use of sophisticated instrumentation.

• 17-Hydroxycorticosteroids (17-OH)17-Hydroxycorticosteroids (17-OH)

  • 1100617-HYDROXYCORTICOSTEROIDS

• 17-Ketosteroids17-Ketosteroids

  • 1100217-KETOSTEROIDS

• 5-aminolevulinic Acid (ALA) -5-aminolevulinic Acid (ALA) – Porphobilinogen (PBG)

  • 11017ALA-PBG

• 5-Hydroxyindoleacetic Acid (5-HIAA)5-Hydroxyindoleacetic Acid (5-HIAA)

  • 110105-HYDROXYINDOLEACETIC ACID

• Control UrineControl Urine

  • 18036CHROMATOGRAPHY

• Hemoglobin A2Hemoglobin A2

  • 11078HB A2

• Hemoglobin Control BloodHemoglobin Control Blood

  • 10011HbA2

• MetanephrinesMetanephrines

  • 11022METANEPHRINES

• Vanilmandelic AcidVanilmandelic Acid

  • 11003VANILMANDELIC ACID

All calibrators are traceable to certified reference systems, international patterns and primary measurement procedures. Each assigned value contains its corresponding measurement uncertainty.

Complete range of materials for internal quality control that comply with the directions set by the ISO 15189.
Their values are traceable to international certified reference materials: C-RSE/IFCC, SRM927 c, SRM 909 b, ERM-DA470, ERM-AD455, BRM 97/662, RM W1066, BCR 470

 

• Biochemistry Calibrators

  • 18065 AMMONIA-ETHANOL-CO2
  • 11513 BILIRRUBIN
  • 18011 BIOCHEMISTRY
  • 18044 BIOCHEMISTRY (HUMAN)
  • 11693 CHOLESTEROL HDL-LDL
  • 11824 CK-MB
  • 11733 HbA1C-ENZYMATIC
  • 11603 PROTEIN (URINE)

• Turbidimetry Calibrators

  • 31130 ALBUMIN (MICROALBUMINURIA)
  • 31100 Apo A-1
  • 31200 Apo B
  • 31119 ASO
  • 31113 CRP – CRP-hs
  • 31182 CRP-er
  • 31048 HbA1c-DIRECT
  • 31075 PROTEINS
  • 31116 RF

CONTROLS

• Biochemistry Control Serum

  • 18063 AMMONIA-ETHANOL-CO2 LEVEL I
  • 18064 AMMONIA-ETHANOL-CO2 LEVEL II
  • 18042 BIOCHEMISTRY (HUMAN) LEVEL I
  • 18043 BIOCHEMISTRY (HUMAN) LEVEL II
  • 18009 BIOCHEMISTRY LEVEL I
  • 18010 BIOCHEMISTRY LEVEL II
  • 18024 CK-MB LEVEL I
  • 18061 CK-MB LEVEL II
  • 18057 FRUCTOSAMINE CONTROL SERUM
  • 18040 LIPID LEVEL I
  • 18041 LIPID LEVEL II

• Control UrineControl Urine

  • 18054 BIOCHEMISTRY URINE
  • 18066 BIOCHEMISTRY URINE LEVEL II

• Hemoglobin Control BloodHemoglobin Control Blood

  • 18002 HbA1c (ELEVATED)
  • 18001 HbA1c (NORMAL)

• Protein Control SerumProtein Control Serum

  • 31211 PROTEIN LEVEL I
  • 31212 PROTEIN LEVEL II
  • 31213 RHEUMATOID LEVEL I
  • 31214 RHEUMATOID LEVEL II

PREVECAL

• Autoimmunity External ControlAutoimmunity External Control

  • 18046 PREVECAL ANA
  • 18056 PREVECAL ANCA
  • 18051 PREVECAL CELIAC
  • 18047 PREVECAL nDNA

• Biochemistry External ControlBiochemistry External Control

  • 18027 PREVECAL BIOCHEMISTRY BOVINE
  • 18045 PREVECAL BIOCHEMISTRY HUMAN
  • 18082 PREVECAL COAGULACIÓN
  • 18067 PREVECAL URINE
  • 18081 PREVECAL VETERINARY

• Proteins External ControlProteins External Control

  • 31010 PREVECAL PROTEINS
  • 31009 PREVECAL RHEUMA