Influenza PCR Test: Complete Guide [2025 Latest Edition] When is the 99.9% Accurate Genetic Test Necessary?

In the diagnosis of influenza, the test that boasts the highest accuracy is the PCR test (Real-Time RT-PCR). While the common rapid antigen test determines if a virus is currently in the body, the PCR test directly detects the virus’s genetic material, making its accuracy over 99.9%.

As of 2025, the PCR test is utilized as the “ultimate weapon” for cases where the result from a conventional rapid test is unclear, or for patients with a high risk of severe illness (such as the elderly and those with underlying health conditions).

Details of the Influenza PCR Test (2025 Japan)

Main Locations for Receiving a PCR Test (As of 2025)

Typical Patterns Where a Doctor Decides on “PCR”

• High fever and difficulty breathing persist after two negative rapid tests.
• High risk of severe illness, such as the elderly, diabetics, or those with heart disease.
• The entire family is positive, but the patient is rapid-test negative.
• Hospitalization is required (especially if a Tamiflu-resistant strain is suspected).
• When a school or facility requires knowledge of the “exact strain type.”

Summary

• Normal people get a rapid test first → PCR only if something is highly suspicious.
• PCR is the “ultimate weapon that provides a nearly 100% correct answer.”
• It is not used unless a doctor deems it necessary because it takes time and is more expensive.

At-Home Testing Kit Ranking (Combined COVID-19 and Influenza)

Here is the English translation of the ranking table for at-home diagnostic kits that test for both COVID-19 and Influenza A/B: