Understanding Lab Tests for Weakened Immune Response
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
A weakened immune response refers to the body's reduced ability to fight off infections, illnesses, and diseases. While there is no single blood test that can directly diagnose a compromised immune system, laboratory testing is fundamental for identifying underlying factors that may be contributing to poor immune function.
Recommended Test
Selenium
Selenium is an essential trace mineral that plays a critical role in maintaining optimal immune system function. This test measures selenium levels in the blood to identify deficiency, which can significantly compromise the body's ability to fight infections and maintain proper immune responses. Low selenium levels have been associated with increased susceptibility to viral infections and reduced vaccine effectiveness.
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Why Blood Testing is Important for Immune Health
The immune system relies on various nutrients, vitamins, and minerals to function optimally. Blood tests can help identify nutritional deficiencies or imbalances that may be weakening your body's natural defense mechanisms. By detecting these underlying issues, healthcare providers can recommend appropriate interventions to support immune system recovery.
Understanding Your Results
If selenium deficiency is detected, your healthcare provider may recommend dietary changes or supplementation to restore optimal levels. Foods rich in selenium include Brazil nuts, seafood, and whole grains. Correcting nutritional deficiencies is often an important step in supporting overall immune system health.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. A comprehensive evaluation of immune function may require additional testing and clinical assessment. Always consult with a healthcare provider for proper diagnosis and treatment of immune system concerns.
