INTENDED USE
The Influenza A Antigen Rapid Test is a rapid chromatographic immunoassay for the qualitative detection of Influenza A antigen in human nasopharyngeal swab, or oropharyngeal swab specimen in individuals who are suspected of respiratory viral infection consistent with flu symptoms.
MATERIALS
Materials Provided
- Foil pouches, each contains one test cassette, and one desiccant bag
- Assay buffer tubes (0.5ml each) with tips
- Disposable Sampling Swabs
- Paper tube holder
- Instruction for use
PRINCIPLE
The Influenza A Antigen Rapid Test is consist with one test strips which could be observed in the window of the rapid test device. The strip is based on sandwich method immunochromatographic assay. The generic Influenza A antigens are targeted individually.
TEST PROCEDURE

Allow the test device, specimen, buffer, and/or controls to reach room temperature (10 - 30°C) prior to testing.
- Remove the test device from the foil pouch and use it within one hour. Best results will be obtained if the test is performed immediately after opening the foil pouch.
- Place the test device on a clean and horizontal surface. Reverse the assay buffer tube, extrude 3 drops (approx. 70μL) of the prepared specimen into the specimen well (S) of the test device and start the timer.
- Wait for the colored line(s) to appear. Read results at 10 minutes. Do not interpret the result after 15 minutes.
INTERPRETATION OF RESULTS
POSITIVE: Two colored bands appear on the membrane. One band appears in the control region (C) and another band appears in the test region (T).
NEGATIVE: Only one colored band appears in the control region (C). No apparent colored band appears in the test region (T).
INVALID: Control band fails to appear.
PERFORMANCE CHARACTERISTICS
1. Sensitivity, Specificity and Accuracy
The Influenza A Antigen Rapid Test has been compared with a commercial gold standard reagent (PCR). The result showed the relative sensitivity and specificity
Method |
Gold standard reagent (PCR) |
Total Results |
Influenza A Antigen Rapid Test |
Results |
Positive |
Negative |
Positive |
165 |
0 |
165 |
Negative |
11 |
376 |
387 |
Total Result |
176 |
376 |
552 |
Relative Sensitivity: 93.75% (95%CI: 89.04%~96.59%)
Relative Specificity: >99.99% (95%CI:98.78%~100.00%)
Accuracy: 98.01% (95%CI:96.42%~98.93%)
2. Limit of Detection (LOD)
The limits of detection of the Influenza A Antigen Rapid Test has been studied.
Pathogens |
Limit of deteftion (LOD) |
Influenza A (H1N1) |
1.2X104 TCID50/mL |
Influenza A (H3N2) |
1.4X104 TCID50/mL |
3. Cross-reactivity
No cross reaction was observed when samples enriched with the following respiratory symptoms relative pathogens: Influenza B, Human coronavirus (229E, HKU1, OC43 and NL63), Parainfluenza virus (type 1-4), Mycoplasma pneumoniae, adenovirus, respiratory syncytial virus, Neisseria meningitidis, mumps virus, Staphylococcus aureus, Streptococcus pneumoniae.
4. Interfering Substances:
No interference was observed to the test strip, with the following compounds: Alpha-interferon, purified Mucin, whole blood, budesonide nasal spray, Oxymetazoline, HAMA, Fluticason propionate.
5.Precision (Repeatability & Reproducibility)
Intra-Assay
Within-run precision has been determined by using 15 replicates of three specimens: a negative, a weak positive and a positive standard. The specimens were correctly identified >99% of the time.
Inter-Assay
Between-run precision has been determined by 15 independent assays on the same two specimens: a negative, a weak positive and a positive standard. Three different lots of the Influenza A Antigen Rapid Test have been tested using these specimens. The specimens were correctly identified >99% of the time.

