Infections occur when harmful microorganisms such as bacteria, viruses, fungi, or parasites invade the body and multiply. The body responds by producing measurable changes in white blood cells, antibodies, and immune system proteins. The Complete Blood Count (CBC) is the most important test for detecting infections because it measures white blood cell count and differential, which become elevated as the immune system mobilizes to fight pathogens.
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Infections are caused by harmful microorganisms including bacteria like Streptococcus and Staphylococcus, viruses such as influenza and COVID-19, fungi like Candida, and parasites. These pathogens enter the body through various routes including breaks in the skin, inhalation, contaminated food or water, or direct contact with infected individuals. Once inside, they multiply and trigger an immune response that produces measurable changes in blood markers like white blood cells and antibodies.
The Complete Blood Count (CBC) with Differential is the most important test for detecting infections because it measures your white blood cell count and identifies which types of white blood cells are elevated. Bacterial infections typically cause neutrophils to increase, while viral infections often elevate lymphocytes. For chronic or past infections, the IgG test is essential as it measures immunoglobulin G antibodies that remain elevated after fighting long-term infections. The IgG, IgA Indirect Immunofluorescence test is the best choice when you need to identify specific pathogens, as it detects antibodies against particular infectious agents.
You should get tested if you experience persistent fever above 100.4°F that lasts more than three days, unexplained fatigue and body aches, swollen lymph nodes in your neck or groin, or wounds that are not healing properly. Testing is also important if you have a weakened immune system due to conditions like diabetes or HIV, take immunosuppressive medications, or have recently traveled to areas with infectious disease outbreaks. Early detection through blood testing helps identify infections before they become severe and guides appropriate treatment.
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What this means
Your hemoglobin is slightly below the optimal range, indicating mild anemia. This means your blood isn't carrying quite enough oxygen to your body's tissues, which can explain feelings of fatigue, weakness, or occasional shortness of breath. With proper nutrition and possibly supplementation, this typically improves within a few months.
Recommended actions
Increase iron-rich foods like lean red meat, beans, lentils, and dark leafy greens
Pair iron sources with vitamin C foods (citrus, tomatoes, bell peppers) to boost absorption
Consider an iron supplement after consulting with your doctor about the right dosage
Retest in 8-12 weeks to monitor improvement after dietary changes
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