Prepared By - Beckman Coulter



This procedure is valid for the following chemistry analyzers:

|AU400/AU400e |AU640/AU640e |

|AU480 |AU680 |

|AU600 |AU2700 |

|AU5400 |AU5800 |

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PRINCIPLE:

Measurement of total protein in urine is important in the diagnosis and treatment of diseases associated with renal, cardiac, and thyroid function. These diseases are often characterized by proteinuria of which there are four main types: (a) glomerular proteinuria - increased glomerular permeability, (b) tubular proteinuria - defective tubular reabsorption, (c) overload proteinuria – increased concentration of low molecular weight protein, (d) postrenal proteinuria - abnormal secretion of protein into the urinary tract1. Increased levels of urinary protein may also be present following strenuous exercise or in the following conditions: monoclonal gammopathies, nephritis, diabetic nephropathy, or urinary tract infections1.

The measurement of total protein in CSF is important in detecting increased permeability of the blood/brain barrier to plasma proteins or to detect increased intrathecal production of immunoglobulins. Increased permeability of the blood/brain barrier may result from conditions such as brain tumor, intracerebral hemorrhage or by inflammation caused by bacterial or viral meningitis, encephalitis, or poliomyelitis. Determination of increased intrathecal synthesis of immunoglobulins is important in the diagnosis of demyelinating diseases such as multiple sclerosis1.

INTENDED USE:

System reagent for the quantitative determination of Total Protein in human urine or cerebrospinal fluid (CSF) on Beckman Coulter AU Clinical Chemistry analyzers.

METHODOLOGY:

Many methods are available for the determination of urinary/CSF protein. These are based on colorimetric, turbidimetric, electrophoretic, or immunological principles. Of the colorimetric methods, the Biuret method lacks sensitivity; the Coomassie Brilliant Blue method has a limited linear range with the added disadvantage of staining cuvettes and other glassware. Results obtained with the turbidimetric methodologies may vary depending on the type of precipitant and type of protein1,2,3.

The Beckman Coulter AU System Urinary/CSF Protein procedure is a colorimetric method. Pyrogallol red is combined with molybdate to form a red complex with a maximum absorbance at 470 nm. The assay is based on the shift in absorbance that occurs when the pyrogallol red-molybdate complex binds basic amino groups of protein molecules. Under the conditions of the test in the presence of protein, a blue-purple complex is formed with a maximum absorbance at 600nm. The absorbance of this complex is directly proportional to the protein concentration in the sample. 1,2,3

SPECIMEN:

Patient Preparation:

None required.

|Additional instructions for patient preparation as designated by this laboratory: |

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Type:

Urine: A 24 hour or 12 hour urine specimen with no preservative is preferred4,5,6. Use of urine samples contaminated by hemoglobin will result in falsely elevated values.

CSF: Beckman Coulter recommends that CSF samples be collected in plain collection devices. Care should be taken to avoid blood contamination during collection.

|Additional type conditions as designated by this laboratory: |

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Handling Conditions:

Urine samples should be analyzed fresh, otherwise store at 2-8°C for up to 48 hours8.

CSF samples should be analyzed fresh, otherwise store at 2-8°C for up to 72 hours4.

|Additional handling conditions as designated by this laboratory: |

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EQUIPMENT AND MATERIALS:

Equipment:

Beckman Coulter AU400/AU400e, AU480, AU600, AU640/AU640e, AU680, AU2700, AU5400 and AU5800 analyzers.

Materials:

Beckman Coulter AU System Urinary/CSF Protein Reagent

Final concentration of reactive ingredients:

|Pyrogallol Red |47µM |

|Sodium Molybdate |320µM |

|Succinic Acid |50mM |

|Sodium Benzoate |3.5mM |

|Sodium Oxalate |1.0mM |

|Methanol |0.8% w/v |

Also contains preservatives.

|Reagent storage location in this laboratory: |

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Test tubes 12 -16 mm in diameter or sample cups (Cat No. AU1063).

|Storage location of test tubes or sample cups in this laboratory: |

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Kit Calibrator

|Human Serum Albumin |50 mg/dL |

Also contains preservatives.

Beckman Urine Calibrator (Cat No. DR0090) may be used for urine chemistry testing. The 50 mg/dL Kit Standard must be used to calibrate for CSF testing.

|Storage location of the calibrator in this laboratory: |

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Precautions:

1. For in vitro diagnostic use.

2. Do not ingest. Harmful if swallowed.

3. The Urinary/CSF Protein Kit Calibrator, as well as the Beckman Coulter Urine Chemistry Calibrator (DR0090) are manufactured from materials of human origin. No known test method can offer complete assurance that products derived from human blood will not transmit infectious agents. Materials used in this calibrator were tested for anti-HCV, HbsAg, and Anti-HIV 1 / 2 on a single donor basis using FDA approved methods and found to be non-reactive. This product should be handled as a potentially infectious material.

4. Contains sodium azide as a preservative, which may react with lead and copper plumbing to form highly explosive metal azides. If waste is discarded down the drain, flush it with a large volume of water to prevent azide buildup.

5. Dispose of all waste materials in accordance with local guidelines.

Preparation:

The Beckman Coulter AU System Urinary/CSF Protein Reagent is liquid, ready for use. No preparation is needed.

The Urinary/CSF Protein Calibrator is liquid, ready to use. No preparation is needed.

Beckman Coulter Urine Calibrator (Cat No. DR0090) is liquid, ready to use. No preparation is needed.

Storage Requirements:

1. The unopened reagents are stable until the expiration date printed on the label when stored at 2 - 8°C.

2. Opened reagents are stable for 90 days when stored in the refrigerated compartment of the analyzer.

3. The opened Kit calibrator is stable until the expiration date printed on the label providing that the stopper and cap are replaced immediately after each use. This is to avoid contamination. The calibrator should be stored at 2 - 8°C when not in use.

4. The unopened Urine Chemistry Calibrator (Cat No DR0090) is stable until the expiration date printed on the label when stored at 2 - 8°C. Once opened, Urine Calibrator is stable for 30 days. Care should be taken to avoid contamination. The bottle should be tightly capped after each use.

Indications of Deterioration:

Discoloration of the reagent, visible signs of microbial growth, turbidity or precipitation in reagent may indicate degradation and warrant discontinuance of use.

|Additional storage requirements as designated by this laboratory: |

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PERFORMANCE PARAMETERS:

The following data was obtained using this Urinary/CSF Protein Reagent on Beckman Coulter AU analyzers according to established procedures. Results obtained at individual facilities may differ.

Precision:11

Estimates of precision, based on CLSI recommendations10, are consistent with typical performance. The within run precision is less than 4%CV and the total precision is less than 5%CV. Assays of control material were performed and this data reduced following CLSI guidelines.

|N=80 |Within run |Total |

|Mean, mg/dL |SD |CV% |SD |CV% |

|15 |0.26 |1.7 |0.72 |4.8 |

|53 |0.64 |1.2 |1.01 |1.9 |

|152 |1.06 |0.7 |2.58 |1.7 |

Method Comparison:11

Patient samples were used to compare this Urinary/CSF Protein Reagent. Representative performance data on AU analyzers is shown in the next table.

|Y Method |AU640/AU640e |

|X Method |Method 2 |

|Slope |1.147 |

|Intercept |6.7 |

|Correl. Coeff. (r) |0.888 |

|No. of Samples (n) |107 |

|Range (mg/dL) |1-192 |

CALIBRATION:

Standard Preparation:

Perform a one-point calibration (AB) using a water blank (blue rack) and the Beckman Urinary/CSF Protein Calibrator (provided with each reagent kit) or Beckman Urine Chemistry Calibrator (Cat. No. DR0090). Calibration stability is 90 days. The kit calibrator is traceable to a primary standard which is prepared gravimetrically using reagent grade human serum albumin.

The Kit Calibrator must be used for calibration when performing CSF testing.

For urine specimens use Beckman Coulter Urine Chemistry Calibrator (DR0090). The assay values for the constituents are traceable to the National Institute of Standards and Technology (NIST).

Calibration Procedure:

Recalibration of this test is required when any of these conditions exist:

1. A reagent lot number has changed or there is an observed shift in control values.

2. Major preventative maintenance was performed on the analyzer.

3. A critical part was replaced.

QUALITY CONTROL:

During operation of the Beckman Coulter AU analyzer at least two levels of an appropriate quality control material should be tested a minimum of once a day. In addition, controls should be performed after calibration, with each new lot of reagents, and after specific maintenance or troubleshooting steps described in the appropriate AU User’s Guide. Quality control testing should be performed in accordance with regulatory requirements and each laboratory’s standard procedure.

|Location of controls used at this laboratory. |

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ANALYZER PARAMETERS:

A complete list of test parameters and operating procedures can be found in the appropriate User’s Guide and at .

CALCULATIONS:

For SI units (g/L), multiply the results by 0.01.

REPORTING RESULTS:

Reference Ranges:

Urine1: 50 - 80 mg/24 h at rest

Values may increase to up to 300mg/24 h following exercise.

CSF(Adults)1: 15 - 45 mg/dL

CSF(Newborn ................
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