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COVID-19 Test Kit Nasal Swab For Professional Use

CE COVID-19 Test Kit (Colloidal Gold Method)

For professional use




COVID-19 Test Kit (Colloidal Gold Method) is a solid phase immunochromatographic assay for the rapid, qualitative detection of antigen to 2019 Novel Coronavirus in human nasal cavity. This test provides only a preliminary test result. Therefore, any reactive specimen with the COVID-19 Test Kit (Colloidal Gold Method) must be confirmed with alternative testing method(s) and clinical findings.



1 test/box

20 tests/box



The novel coronaviruses belong to the β genus, COVID-19 is an acute respiratory infectious disease. People are generally susceptible. Currently, the patients infected by the novel coronavirus are the main source of infection; asymptomatically infected people can also be an infectious source. Based on the current epidemiological investigation, the incubation period is 1 to 14 days, mostly 3 to 7 days. The main manifestations include fever, fatigue and dry cough. Nasal congestion, runny nose, sore throat, myalgia and diarrhea are found in a few cases.



The COVID-19 Test Kit (Colloidal Gold Method) is a colloidal gold immunochromatographic assay. It detects the nucleocapsid protein on the surface of COVID-19.

The test uses COVID-19 (SARS-CoV-2) antibody (test line T) and goat anti-mouse IgG (control line C) immobilized on a nitrocellulose strip. The burgundy colored conjugate pad contains colloidal gold conjugated to another COVID-19 (SARS-CoV-2) antibody and mouse IgG-gold conjugates. When the processed buffer containing the sample is added to the sample well, COVID-19 (SARS-CoV-2) will combine with the COVID-19 antibody conjugate to form an antigen-antibody complex. This complex migrates through nitrocellulose membrane by capillary action. When the complex meets the line of the COVID-19 antibody of test line T, the complex is trapped forming a burgundy colored band which confirm a reactive test result. Absence of a colored band in the test region indicates a non-reactive test result.

The test contains an internal control (C band) which should exhibit a burgundy colored band of the immunocomplex goat anti-mouse IgG/mouse IgG-gold conjugate regardless of the color development on any of the test bands.

Otherwise, the test result is invalid and the specimen must be retested with another device.



Sealed pouches each containing a test cassette, a desiccant

Sampling cotton swabs (for nasal sampling only)

Antigen extract buffer

Antigen extraction tube

Paper workbench (The small one-test-box can be used as a workbench)

Instruction for use



1. Specimen collection containers

2. Timer



The kit can be stored at room temperature or refrigerated (4-30°C). The test device is stable through the expiration date printed on the sealed pouch. The test device must remain in the sealed pouch until use.

Do not freeze.

Do not use beyond the expiration date.



1. For professional In Vitro diagnostic use only. Do not use after expiration date.

2. This package insert must be read completely before performing the test. Failure to follow the insert gives inaccurate test results.

3. Do not use it if the tube/pouch is damaged or broken.

4. Test is for single use only. Do not re-use under any circumstances.

5. Handle all specimens as if they contain infectious agents. Observe established precautions against microbiological hazards throughout testing and follow the standard procedures for proper disposal of specimens.

6. Wear protective clothing such as laboratory coats, disposable gloves and eye protection when specimens are assayed.

7. Humidity and temperature can adversely affect results.

8. Do not perform the test in a room with strong air flow, ie. electric fan or strong air-conditioning.



Allow test cassette, specimen, and Antigen extract buffer control to equilibrate to room temperature (15-30°C) prior to testing.

1. Remove the test cassette from the sealed foil pouch and use it as soon as possible. Best results will be obtained if the assay is performed within one hour.

2. Place the test device on a clean and level surface.

Operation procedure:

1. Ask the patient to remove the secretions on the surface of the anterior nasal cavity, keep the head slightly tilted, and gently and slowly insert the swab through the nasal cavity(about 2-4cm), it will reach the posterior nasal cavity, stay for a few seconds to absorb secretions, and gently rotate to remove the swab.


2. Place the antigen extraction tube on the workbench. Place the antigen extraction buffer bottle vertically downward, squeeze the bottle to make the buffer drip freely into the extraction tube without touching the edge of the tube, and add 6 drops (about 200ul) to the extraction tube.

3. Put the swab specimen into the extraction tube pre-added with the antigen extraction buffer, and rotate the swab about 10 times while pressing the swab head against the tube wall to release the antigen in the swab,then let it stand for about 1 minute.

4. Remove the swab while squeezing the tip of the swab so that as much liquid in the swab can be discharged as possible. Dispose of used swabs in accordance with biohazard waste disposal methods.

5. Install the dripper on the extraction tube and cap it tightly, and let it stand for about 1 minute.

6. Open the aluminum foil bag and take out the test card, add 3 drops (about 100ul) into the sample hole of the test card (or use a pipette to add 100ul), and start the timer.

7. Wait for the colored line to appear. The result should be read in 15 minutes. Do not interpret the result after 20 minutes.



NEGATIVE: If only the C band is present, the absence of any burgundy color in the T band indicates that no COVID-19 (SARS-CoV-2) antigen are detected in the specimen. The result is negative.

COVID-19 positive:

In addition to the presence of C band, if T band is developed, the test indicates for the presence of COVID-19 (SARS-CoV-2) antigen in the specimen. The result is COVID-19 positive.


Control line fails to appear. Insufficient specimen volume or incorrect procedural techniques are the most likely reasons for control line failure. Review the procedure and repeat the test with a new test cassette. If the problem persists, discontinue using the test kit immediately and contact your local distributor.



1. Use fresh samples whenever possible.

2. Optimal assay performance requires strict adherence to the assay procedure described in this insert sheet. Deviations may lead to aberrant results.

3. A negative result for an individual subject indicates absence of detectable COVID-19 (SARS-CoV-2) antigen. However, a negative test result does not preclude the possibility of exposure to or infection with COVID-19.

4. A negative result can occur if the quantity of the COVID-19 (SARS-CoV-2) antigen present in the specimen is below the detection limits of the assay, or failed to collect the COVID-19 (SARS-COV-2) antigen in the nasal cavity of the patient.

5. As with all diagnostic tests, a definitive clinical diagnosis should not be based on the result of a single test, but should only be made by the physician after all clinical and laboratory findings have been evaluated.



1. Clinical Sensitivity, Specificity and Accuracy

The results of the COVID-19 Test Kit (Colloidal Gold Method) were compared to results of RT-PCR assays for SARS-CoV-2 in nasal swab specimens. A total of 510 nasal cavity specimens were tested in this study. The COVID-19 clinical specimens contain specimens from individuals with symptoms within 7 days. The results of test reagent and control reagent both were 402 negative specimens and 108 positive specimens. The sensitivity and specificity calculated were valid in this study.

Table 1 COVID-19 Test Kit vs PCR


2.Limit of Detection (LOD)

LOD studies determine the lowest detectable concentration of SARS-CoV-2 at which approximately 95% of all (true positive) replicates test positive. Heat inactivated SARS-CoV-2 virus, with a stock concentration of 7.8 x 107 TCID50/mL, was spiked into negative specimen and serially diluted. Each dilution was ran in triplicate on the COVID-19 Test Kit. The Limit of Detection of the COVID-19 Test kit is 9.75 x 102 TCID50/mL (Table 2).

Table 2 Limit of Detection (LOD) Study Results


Version: Issued date: 2023-01-03

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