An ESR test measures the rate at which red blood cells (erythrocytes) settle (sediment) in one hour at the bottom of a tube that contains a blood sample.

When there is inflammation in the body, certain proteins, mainly fibrinogen, increase in the blood. This increased amount of fibrinogen causes the red blood cells to form a stack (rouleaux formation) that settles quickly due to its high density, leading to an increase in the ESR.

An ESR test is a non-specific measure of inflammation and can be affected by conditions other than inflammation. This test cannot identify the exact location of the inflammation in your body or what is causing it. Hence, an ESR test is usually performed along with a few other tests to identify or treat possible health concerns.

The Influenza A test checks for the presence of Influenza A virus and confirms the infection. Influenza A virus can infect both animals and humans and is responsible for most seasonal flu outbreaks. These viruses are further classified based on two proteins on their surface, called hemagglutinin (H) and neuraminidase (N). There are 18 different H subtypes and 11 different N subtypes, which can combine ivariousnt ways to create new strains of the virus.

The Influenza B test checks for the presence of the Influenza B virus and confirms the infection. This type of influenza virus only infects humans and is less common than influenza A. Influenza B viruses are not classified based on two proteins on the surface, called hemagglutinin (H) and neuraminidase (N) subtypes, but are instead grouped into two distinct lineages, B/Yamagata and B/Victoria.

The Respiratory Syncytial Virus (RSV) test checks for the presence of Respiratory Syncytial Virus (RSV) and confirms the infection. This test should be performed within a few days after symptoms occur when there’s a greater detectable amount of the virus. RSV is a major cause of human respiratory infections, particularly among younger children who are affected most frequently with potentially most severe infections.

The H1N1 test checks for the presence of the H1N1 virus, also called the swine flu (influenza) virus, and confirms the infection. Influenza or flu is a viral infection that affects your respiratory system. The infection is usually mild and resolves on its own, but the infection can be life-threatening in children under 5 years, adults above 65 years of age, and those with weakened immune systems. Hence, early detection via timely testing becomes crucial.

The H3N2 test checks for the presence of the H3N2 virus and confirms the infection. The influenza A virus has a subtype known as H3N2, which can induce sickness in humans and animals such as pigs and birds. This particular strain of the flu virus is capable of causing illness. During testing, respiratory specimens such as nasopharyngeal swabs or nasal washes are analyzed to detect viral RNA or antigens.

The RNase P gene is used in the CDC (Centers for Disease Control and Prevention) protocol as an internal control (IC) for the detection of COVID-19, since this is a multi-copy gene that is abundant in the human genome, and therefore is easily detectable. Ribonuclease P (RNase P) is an endoribonuclease that cleaves other RNA molecules at the junction between a single-stranded region and the 5′ end of a double-stranded region. The enzyme is one of only two ribozymes that can be found in all kingdoms of life (Bacteria, Archaea, and Eukarya).