Biochemical Markers – Definition and Significance
Biochemical markers are measurable biological substances in blood, urine, or tissue that provide information about diseases, organ functions, or metabolic processes.
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Biochemical markers are measurable biological substances in blood, urine, or tissue that provide information about diseases, organ functions, or metabolic processes.
What Are Biochemical Markers?
Biochemical markers (also referred to as biomarkers) are measurable biological substances or molecules that can be detected in body fluids such as blood, urine, or cerebrospinal fluid, as well as in tissues. They serve as objective indicators of physiological or pathological processes in the body and play a central role in modern medicine for diagnosis, disease monitoring, and therapy management.
Common biochemical markers include enzymes, hormones, proteins, lipids, metabolic byproducts, and genetic molecules. Their concentration in the body can indicate specific diseases or reflect the success of a treatment.
Types of Biochemical Markers
Diagnostic Markers
These markers are used to detect or confirm a disease. A classic example is troponin, which is found at elevated levels in the blood following a heart attack.
Prognostic Markers
Prognostic markers provide information about the likely course of a disease, helping physicians assess how a condition may develop over time. Examples include PSA (prostate-specific antigen) in prostate cancer and BNP (B-type natriuretic peptide) in heart failure.
Predictive Markers
Predictive markers indicate how likely a patient is to respond to a specific therapy. They are especially relevant in oncology and personalized medicine.
Monitoring Markers
These markers are used for follow-up and to assess treatment success or detect disease recurrence at an early stage. A well-known example is the HbA1c value used for long-term blood glucose monitoring in diabetes mellitus.
Areas of Application
- Cardiology: Troponin I and T, CK-MB, BNP, NT-proBNP for heart conditions
- Oncology: CEA, CA 125, PSA, AFP for various cancer types
- Endocrinology: TSH, T3, T4 for thyroid disorders; HbA1c, insulin for diabetes
- Nephrology: Creatinine, cystatin C, urea to assess kidney function
- Hepatology: ALT, AST, bilirubin, albumin for liver diseases
- Inflammation diagnostics: CRP (C-reactive protein), procalcitonin, interleukin-6 for infections and inflammatory conditions
- Neurology: Tau protein, beta-amyloid in cerebrospinal fluid for neurodegenerative diseases
Diagnosis and Measurement
Biochemical markers are typically measured through laboratory analyses. The most common methods include:
- Immunoassays (e.g., ELISA): highly sensitive methods for measuring proteins and hormones
- Photometry: measurement of enzyme activities and metabolic products
- Chromatography: separation and quantification of substances such as hormones or drugs
- Point-of-care tests: rapid tests for immediate diagnostics, such as rapid troponin tests
Measurement results are always interpreted within the clinical context, as reference values may depend on age, sex, time of day, and other factors.
Clinical Significance
Biochemical markers have revolutionized modern medicine. They enable earlier and more precise diagnoses, reduce the need for invasive procedures, and allow for individualized treatment planning. Molecular biomarkers are becoming increasingly important in the field of personalized medicine, enabling targeted therapy decisions based on each patient's individual profile.
It is important to note, however, that no single biochemical marker can provide a definitive diagnosis on its own. They are always evaluated in combination with clinical findings, imaging results, and the patient's medical history.
References
- Lothar Thomas (Ed.): Labor und Diagnose. Indikation und Bewertung von Laborbefunden fuer die medizinische Diagnostik. 8th Edition, TH-Books Verlagsgesellschaft, Frankfurt am Main, 2012.
- World Health Organization (WHO): Biomarkers in Risk Assessment -- Validity and Validation. Environmental Health Criteria 222. WHO, Geneva, 2001. Available at: https://www.who.int
- Strimbu K, Tavel JA: What are Biomarkers? Current Opinion in HIV and AIDS, 2010; 5(6): 463-466. Available at: https://pubmed.ncbi.nlm.nih.gov/20978388
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