What Is a Biological Marker (Biomarker)?
A biological marker, commonly called a biomarker, is a measurable substance, characteristic, or biological process that provides information about a person’s health or disease. Biomarkers help healthcare providers detect diseases, monitor treatment effectiveness, predict disease progression, and guide personalized medical care.
Biomarkers may be measured in blood, urine, saliva, tissue samples, or through imaging studies.
Why Biomarkers Matter
Biomarkers allow healthcare providers to diagnose conditions earlier, evaluate how well treatments are working, and make more personalized medical decisions based on an individual’s health status.
Common Examples of Biomarkers
- Blood glucose
- Hemoglobin A1C (HbA1c)
- Cholesterol levels
- Troponin
- Prostate-specific antigen (PSA)
- C-reactive protein (CRP)
- Cancer tumor markers
How Biomarkers Are Used
- Diagnosing diseases
- Monitoring chronic conditions
- Evaluating treatment response
- Assessing disease progression
- Estimating future health risks
- Supporting personalized medicine
How Home Care Can Help
Home care professionals encourage medication adherence, support healthy lifestyle habits, assist with monitoring chronic conditions, remind individuals about laboratory testing, and communicate changes in health to the healthcare provider.
Home Care Tip
Keep scheduled laboratory appointments and follow-up visits, as biomarker testing often helps your healthcare provider monitor your health over time.
Frequently Asked Questions About Biomarkers
Are biomarkers only used to diagnose cancer?
No. Biomarkers are used to diagnose and monitor many conditions, including diabetes, heart disease, kidney disease, infections, autoimmune disorders, and certain cancers.
Can biomarker levels change over time?
Yes. Many biomarkers change as health conditions improve, worsen, or respond to treatment, making repeat testing an important part of ongoing care.
Can home care help monitor chronic conditions?
Yes. Home care professionals help individuals follow treatment plans, recognize changes in symptoms, and maintain regular communication with their healthcare team.
When to Contact Your Healthcare Provider
Contact your healthcare provider if your symptoms worsen, new symptoms develop, or you have questions about changes in your laboratory results or biomarker levels.