Is a blood test for influenza A done by drawing blood?

Mar 12, 2025 Source: Cainiu Health

Dr. Ren Yi

Introduction

Under normal circumstances, "Jia Liu" refers to influenza A, and testing generally involves drawing blood. In daily life, wash hands frequently with soap or hand sanitizer, following the seven-step handwashing technique thoroughly, especially after touching public items, before meals, and after using the restroom. When coughing or sneezing, cover the mouth and nose with tissues or the elbow to prevent spreading the virus through droplets to others.

Generally speaking, "A flu" refers to influenza A, and blood tests are usually required for influenza A testing. The specific analysis is as follows:

Blood tests for influenza A primarily involve routine blood tests, blood biochemistry, and tests for influenza A virus-specific antibodies. A routine blood test can help determine whether there is an infection, as indicators such as white blood cell count and lymphocyte count may be abnormal. Blood biochemistry tests provide information about liver and kidney function and electrolyte levels, helping assess the impact of the illness on the body's metabolism. Influenza A virus-specific antibody testing, such as detecting IgM and IgG antibodies in the serum, can also be performed. A positive IgM antibody result often indicates a recent infection with the influenza A virus.

In addition, nucleic acid testing may also be conducted using blood samples to detect the nucleic acid of the influenza A virus. This method offers high specificity and sensitivity, providing strong evidence for diagnosis. These tests are important for accurately determining whether an influenza A infection is present and for assessing the severity of the illness, which is why blood samples are collected via venipuncture for laboratory analysis.

In daily life, wash your hands frequently with soap or hand sanitizer, following the seven-step handwashing technique thoroughly, especially after touching public items, before meals, and after using the toilet. When coughing or sneezing, cover your mouth and nose with tissues or your elbow to prevent spreading the virus through droplets.

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Is dizziness after influenza A a sign of recovery?

Under normal circumstances, "Jia Liu" refers to Influenza A H1N1. Whether dizziness following Influenza A H1N1 indicates recovery depends on the specific circumstances. If dizziness is the only symptom present without other accompanying symptoms, it usually suggests the condition is improving. However, if dizziness is accompanied by other systemic symptoms such as headache, tinnitus, or fatigue, it may not indicate improvement. If any discomfort persists, prompt medical attention is recommended.

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What does a high level of amyloid A protein indicate?

Infection is a common cause of elevated marker levels. During bacterial infections such as pneumonia and pyelonephritis, serum amyloid A protein rapidly increases within hours, and the extent of elevation often correlates with the severity of the infection. Viral infections, such as influenza and coronavirus infection, can also lead to increased levels, although the rise is typically less pronounced than in bacterial infections, making it a useful adjunct for differentiating types of infection.