Anti-HBs. Intended Use
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1 Anti-HBs Principle of the Test The ImmunoComb II Anti-HBs test is a solid-phase enzyme immunoassay (EIA), based on a dual recognition principle. The solid phase is a card with 12 projections ("teeth"). Each tooth is sensitized at two positions: upper spot biotinylated bovine serum albumin (Internal Control) lower spot recombinant HbsAg The Developing Plate has 6 rows (A-F) of 12 wells, each row containing a reagent solution ready for use at a different step in the assay. The test is performed stepwise, by moving the card from row to row, with incubation at each step. To start the test, serum or plasma specimens are added to the diluent in the wells of row A of the Developing Plate. The card is then inserted in the wells of row A. Anti-HBs antibodies, if present in the specimens, will bind to the HBsAg on the lower spots on the teeth of the Card (Figure 1). Unbound components are washed away in row B. In row C, anti-hbs antibodies captured on the lower spots of the teeth, will react with biotinylated HBsAg. In row D the biotinylated antigen/antibody complex on the lower spots of the teeth, and biotinylated bovine serum albumin on the upper spots (Internal Control), will react with streptavidin conjugated to alkaline phosphatase (). In row E unbound components are removed by washing. In row F, the bound alkaline phosphatase will react with chromogenic substrate. The results are visible as gray-blue spots on the surface of the teeth of the Card. HBsAg antibody complex formation; 120 min/37 C anti-hbs B B Binding of biotinylated HBsAg; 30 min/37 C Code: For In vitro Diagnostic Use only Intended Use Format: 3 x 12 tests The ImmunoComb II Anti-HBs Kit is a rapid test for the quantitative determination of antibodies to hepatitis B virus surface antigen (HBsAg) in human serum or plasma. Thirty-six tests may be performed with one kit. Introduction Hepatitis B Virus (HBV) belongs to a new family of DNA viruses called Hepadnaviridae. It features a marked hepatotropism and a unique means of replication through a reverse transcription mechanism. The complete virion, or Dane particle, consists of a circular DNA molecule protected by a nucleocapsid/core antigen (HBcAg), and surrounded by a lipoprotein envelop consisting of the surface antigen (HBsAg). HBsAg is also found in blood as incomplete, non-infective spherical particles or filaments. A minor component of the HBV nucleocapsid, the HBe antigen (HBeAg), is also detectable in the blood during the replicative phase of the virus. Hepatitis B virus is an ubiquitous virus with global distribution. The main routes of viral transmission are horizontal, through sexual and parenteral contamination, and vertical, through prenatal transmission from infected mother to the fetus. The clinical consequences of HBV infection range from totally inapparent (70% of cases) to icteric acute hepatitis. Most patients recover completely within 6 months after onset of the disease. A small proportion of the infected population (<1.5%) may develop fulminant hepatitis, often with fatal outcome. In a substantial proportion (up to 10%) of adult patients, HBV can persist, eventually progressing to chronic hepatitis with ultimate development of cirrhosis and hepatocarcinoma. Chronic carriers of hepatitis B (200 million worldwide) make up the main reservoir of virus and contribute to the spread of the disease. Antibodies to HBsAg (anti-hbs) are the principal neutralizing antibodies of HBV, which usually persist for lifetime and protect against reinfection. The level of anti-hbs, therefore, serves as an indicator to assess recovery from HBV infection, or the success of vaccination using HBsAg particles. Antibody concentrations of 10 IU/L indicate immunity to HBV. Biotinylated HBsAg Streptavidin - chromogenic substrate Figure 1. Principle of the Test Binding of streptavidin- ; 20 min/37 C Enzymatic color reaction; 10 min/37 C The kit includes a Positive Control (anti-hbs) and a Negative Control, to be included in each assay run. Upon completion of the test, the tooth used with the Positive Control should show 2 gray-blue spots. The tooth used with the Negative Control should show the upper spot and either no lower spot or a faint lower spot. The upper spot should also appear on all other teeth, to confirm that the kit functions properly and that the test was performed correctly. Kit Contents Cards The kit contains 3 plastic Cards. Each Card has 12 teeth, one tooth for each test (Figure 2). Each tooth is sensitized with two reactive areas: upper spot biotinylated bovine serum albumin (Internal Control) lower spot recombinant HBsAg Figure 2: Card ImmunoComb II Internal Control recomb. HBsAg The Cards are provided in aluminum pouches containing a desiccant bag /E12/OR/CE 1
2 Developing Plates The kit contains 3 Developing Plates covered with aluminum foil. Each Developing Plate (Figure 3) contains all reagents needed for the test. The Developing Plate consists of 6 rows (A F) of 12 wells each. The contents of each row are as follows: Row A Row B Row C Row D Row E Row F specimen diluent washing solution biotinylated HbsAg streptavidin conjugated to alkaline phosphatase washing solution chromogenic substrate solution containing 5-bromo-4-chloro-3-indolyl phosphate (BCIP) and nitro blue tetrazolium (NBT) Figure 3. Developing Plate Positive Control 1 vial (red-colored cap) of 1.5 ml, heat-inactivated human plasma, diluted to a cut-off level of 10 IU/mL for anti-hbs. Negative Control 1 vial (green-colored cap) of 1.5 ml diluted, heat-inactivated, anti-hbs-negative human plasma. Perforator for perforation of the aluminum foil, covering the wells of the Developing Plate. CombScale for reading test results. Safety and Precautions Human source materials used in the preparation of the kit were tested and found to be non-reactive for HBsAg, and for antibodies to HIV and to hepatitis C virus. Since no test method can give complete assurance of the absence of viral contamination, all reference solutions and all human specimens should be handled as potentially infectious. Wear surgical gloves and laboratory clothing. Follow accepted laboratory procedures for working with human serum or plasma. Do not pipette by mouth. Dispose of all specimens, used Cards*, Developing Plates, wash water, and other materials used with the kit as biohazardous waste. Do not mix reagents from different lots. Do not use kit after the expiry date. Storage and Stability of the kit The kit is shipped at 2-8 o C. During transport the kit can be kept at 30 o C for short time periods not exceeding a total of 48 hours. The internal controls indicate that the kit has not been damaged during transport. Store the kit in its original box at 2-8 o C. Do not freeze the kit. Following the first opening of the Kit the components have to be stored at 2-8 o C. Performance of the Kit after the first opening is stable up to the expiry date of the Kit, when stored at 2-8 o C. After first use, the card and plate cannot be used for more than three times. Handling of Specimens You may test either serum or plasma. Specimens may be stored for 7 days at 2 8 C before testing. To store for more than 7 days, freeze specimens at 20 C or colder. After serum specimens have thawed, centrifuge them. Test the supernatant. Avoid repeated freezing and thawing. Anti coagulants such as heparin, EDTA and sodium citrate were found to have no effect on the test results. Test Procedure Equipment Needed Adjustable precision pipettes with disposable tips for dispensing 100 µl Scissors Laboratory timer or watch * Unless stored for documentation Preparing the Test Bring all components, cards, reagents and specimens to room temperature and perform the test at 37 C. Preparing the Developing Plate 1. Incubate the Developing Plate in an incubator at 37 C for 45 minutes. 2. Cover the work table with absorbent tissue to be discarded as biohazardous waste at the end of the test. 3. Mix reagents by shaking the Developing Plate. Note: Do not remove the foil cover of the Developing Plate. Break the foil cover by using the disposable tip of the pipette or the perforator, only when instructed to do so by the Test Instructions. Preparing the Card Caution: To ensure proper functioning of the test, do not touch the teeth of the Card. 1. Tear the aluminum pouch of the Card at the notched edge. Remove the Card. 2. You may use the entire Card and Developing Plate or only a part. To use part of a Card: a. Determine how many teeth you need for testing the specimens and controls. You need one tooth for each test. Each tooth displays the code number "53" of the kit, to enable identification of detached teeth. b. Bend and break the Card vertically or cut with scissors (see Figure 4) to detach the required number of teeth (No. of tests + 2 controls). c. Return the unused portion of the Card to the aluminum pouch (with desiccant bag). Close pouch tightly, e.g. with a paper clip, to maintain dryness. Store the Card in the original kit box at 2 8 C for later use. ImmunoComb II Figure 4. Breaking the Card Test Instructions Note: Perform incubations at 37 C. Washing steps should be carried out at room temperature (22 26 C). Antigen Antibody Reaction (Row A of the Developing Plate) 1. Pipette 100 µl of specimen. Perforate the foil cover of one well in row A of the Developing Plate with the pipette tip or perforator and dispense the specimen at the bottom of the well. Mix by repeatedly refilling and ejecting the solution. Discard pipette tip. 2. Repeat step 1 for the other specimens, including one Positive and one Negative Control supplied with the kit. Use a new well in row A and change pipette tips for each specimen or control. 3. a. Insert the Card (printed side facing you) into the wells of row A containing specimens and controls. Mix: Withdraw and insert the Card in the wells several times. b. Leave the Card in row A and incubate for 120 minutes at 37 C. Set the timer. Mix an additional three times (each 30 min) during the incubation. Near the end of 120 minutes, perforate the foil of row B using the perforator. Do not open more wells than needed. c. At the end of 120 minutes, take the Card out of row A. Absorb adhering liquid from the pointed tips of the teeth on clean absorbent paper. Do not touch the front surface of the teeth. First Wash (Row B) 4. Insert the Card into the wells of row B. Agitate: Vigorously withdraw and insert the Card in the wells for at least 10 seconds to achieve proper washing. Repeat agitation several times during the course of 2 minutes; meanwhile perforate the foil of row C. After 2 minutes, withdraw the Card and absorb adhering liquid as in step 3c. Binding of Biotinylated HBsAg (Row C) 5. Insert the Card into the wells of row C. Mix as in step 3a. Incubate Developing Plate with Card for 30 minutes (set timer) at 37 C. Perforate the foil of row D. Mix an additional time during the incubation. After 30 minutes, withdraw the Card and absorb adhering liquid. Binding of Streptavidin/alkaline phosphatase (Row D) 6. Insert the Card into the wells of row D. Mix. Incubate Developing Plate with Card for 20 minutes (set timer) at 37 C. perforate the foil of row E /E12/OR/CE 2
3 Mix an additional time during the incubation After 20 minutes, withdraw the Card and absorb adhering liquid. Second Wash (Row E) 7. Insert the Card into the wells of row E. Repeatedly agitate during 2 minutes, as in step 4. Meanwhile perforate the foil of row F. After 2 minutes, withdraw the Card and absorb adhering liquid. Color Reaction (Row F) 8. Insert the Card into the wells of row F. Mix. Incubate Developing Plate with Card for exactly 10 minutes (set timer) at 37 C. Mix an additional time during the incubation After 10 minutes, withdraw the Card. Stop Reaction (Row E) 9. Insert the Card again into row E. After 1 minute, withdraw the Card and allow it to dry in the air. Storing Unused Part of Kit Developing Plate If you have not used all the wells of the Developing Plate, you may store it for future use: Seal used wells with wide adhesive tape so that nothing can spill out of the wells, even if the Developing Plate is tipped over. Other Kit Materials Return remaining Developing Plate(s), Card(s), perforator, controls, and instructions to the original kit box. Store at 2 8 C. Test Results Validation In order to confirm the proper functioning of the test and to demonstrate that the results are valid, the following three conditions must be fulfilled (see Figure 5): 1. The Positive Control must produce two spots on the Card tooth. 2. The Negative Control must produce an upper spot (Internal Control). The lower spot will either not appear or appear very faintly. 3. Each specimen tested must produce an upper spot (Internal Control). If any of the three conditions are not fulfilled, the results are invalid, and the specimens and controls should be retested. Positive Control Negative Control Figure 5. Test Validation Invalid Results Reading and Interpretation of the Results Screening Compare the intensity of the lower spot of each specimen tooth with that of the lower spot of the Positive Control tooth (Figure 6). A spot with an intensity higher than or equal to that of the Positive Control indicates the presence of anti-hbs at a titer of 10 IU/L. A spot with an intensity less than that of the Positive Control is considered a negative result. Positive Control Specimen in the window above that intensity, as the approximate titer of anti-hbs for the corresponding specimen. Orgenics CombScale 5 ANTI-HBs IU/L 10 C Figure 7. CombScale Documentation of Results As the color developed on the Card is stable, the Cards may be stored for documentation. Limitations As with other tests intended for in vitro diagnostic use, the results of this test should be evaluated in relation to all symptoms, clinical history and other laboratory findings for the patient. Performance Characteristics* The sensitivity and the specificity of the ImmunoComb II Anti-HBs Kit were evaluated on a panel of 170 serum specimens, in comparison with two EIA reference assays. The combined results are summarized in Table 2. Table 2. Test results Reference Assays ImmunoComb II Anti-HBs Positive Positive 50 0 Negative Negative The following aggregated performance characteristics were calculated: Sensitivity 100 % Specificity 98.3 % Repeatability Each of 6 sera was assayed 12 times on a single card, and the results were quantitated as absorbance readings. The CV of the measured valiues did not exceed 10 %. Reproducibility Six sera were assayed in duplicate in each of 10 separate kits, and the results were quantified as absorbence readings. The coefficient of variation (% C.V.) of the results did not exceed 10% Cross-reactivity Cross-reactivity with positive samples of hepatitis causing agents such as hepatitis A virus, hepatitis C virus, cytomegalovirus and toxoplasma was found to be insignificant. Interference No Interference with hemolytic (hemoglobin up to 10 mg/ml), lipemic (Cholesterol up to mg/dl; Triglycerids up to mg/dl) and high bilirubin (up to 20 mg/dl) samples was observed. * Detailed data available upon request Negative Result Figure 6. Test Results Anti-HBs at a titer of =10 IU/L Semiquantitative Interpretation by Visual Reading The level of anti-hbs in each specimen may be assessed by comparing the color intensity of the lower spot on each tooth, with the color scale on the CombScale provided with the kit. This is performed as follows (Figure 7): 1. Calibrate the CombScale. Place the lower spot on the Positive Control tooth underneath the most similar color intensity of the color scale. Adjust the ruler so that "10; C+" appears in the window above the selected color intensity. 2. Read results without changing the calibrated position of the ruler. Match the color intensity of each lower spot with the most similar intensity on the color scale. Record the value displayed /E12/OR/CE 3
4 Bibliography Follet EAC Diagnosis of hepatitis B infection. In: Hugh Y, McMillan A, eds. Immunological diagnosis of sexually transmitted diseases. Marcel Dekker, New York. pp Herrera JL Serological diagnosis of viral hepatitis. S Med J 87: Hollinger FB Hepatitis B virus. In: Viral Hepatitis. (Hollinger FB, Purcel RH, Robinson WS, Gerin JL, Ticehurst J, eds.) Raven Press, New York. pp Kiyasu PK, Caldwell SH Diagnosis and treatment of the major hepatotropic viruses. Am J Med Sci 306: Krugman S, Overby LR, Mushawar IK, Ling C-M, Frösner GG, Deinhart F Viral hepatitis, type B: studies on natural history and prevention re-examined. N Engl J Med 300: Ogra PL, Beutner KR Hepatitis viruses. In: Milgrom F, Abeyounis CJ, Kano K, eds. Principles of immunological diagnosis in medicine. Lea & Febiger, Philadelphia. pp Robinson WS Hepadnaviridae and their replication. In: Viral Hepatitis. (Hollinger FB, Purcell, RH, Robinson WS, Gerin JL, Ticehurst J, eds.) Raven Press, New York.pp Swenson PD Hepatitis viruses. In: Balows A, Hausler WJ, Herrmann KL, Isenberg HD, Shadomy HJ, eds. Manual of Clinical Microbiology, Fifth edition. American Society for Microbiology, Washington, DC. pp Manufacturer: Orgenics Ltd., part of the Inverness Medical Innovations Group. P.O.B 360 Yavne 70650, Israel Tel: Fax: Authorised Representative in EU: Orgenics France S.A. 19, rue Lambrechts Courbevoie, France Tel: Fax: Version: /E12/OR/CE (12/2006) Symbols Legend CARD PLATE CONTROL + CONTROL - ImmunoComb Card Developing Plate Positive Control Negative Control PERFORATOR COMBSCALE IVD Σ n Perforator CombScale Consult Instructions for Use In Vitro Diagnostic Medical Device Temperature limitation Contains sufficient for n tests Manufacturer Authorized Representative in the European Community REF LOT Catalogue number Batch code Use by Serial number /E12/OR/CE 4
5 Summary of Main Test Procedures Preincubation of the Developing Plate: 45 minutes at 37 C Drawing specimens and controls Adding specimens and controls to row A. Mix Removing Card from pouch Inserting Card and mixing in row A. Incubation at 37 C Opening row B Absorbing adhering liquid from teeth Inserting Card and agitating in row B. Incubation After mixing/agitating & incubating in rows C, D and E. Color reaction in row F 9 10 Results Summary of the Test Procedure The abbreviated instructions below are for experienced users of the ImmunoComb II Anti-HBs Kit. (For detailed instructions please refer to complete text inside) 1. Incubate the Developing Plate in an incubator at 37ºC for 45 minutes. 2. Dispense 100 µl of each specimen and control into the wells of row A of the Developing Plate and mix. 3. Insert Card in row A and continue as described in Table 1. Table 1. Summary of test procedure(s) Step Row Proceed as follows Antigen-antibody reaction A Mix; incubate 2 hours at 37ºC; absorb. 1 Wash B Agitate; incubate 2 minutes; absorb. Binding of biotinylated HBsAg C Mix; incubate 30 minutes at 37ºC; absorb. Binding of streptavidin/alkaline phosphatase D Mix; incubate 20 minutes at 37ºC; absorb. Wash E Agitate; incubate 2 minutes; absorb. Color reaction F Mix; incubate 10 minutes at 37ºC. Stop reaction E Incubate 1 minute; dry in air. Bending and breaking the Card /E12/OR/CE 5
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