Serum Alpha-Fetoprotein (AFP)
Major fetal plasma glycoprotein synthesized by the fetal yolk sac and liver, analogous to adult serum albumin.
Standard vs. Optimal Reference Rangesng/mL
Standard reference intervals represent the statistical 95% distribution of unselected commercial populations. Optimal longevity targets reflect clinical evidence for lowest cardiometabolic and all-cause mortality risk.
Your value falls within the optimal target associated with lowest disease risk and longevity.
<8.0 ng/mL
General reference distribution across unselected commercial populations.
<5.0 ng/mL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Expression is transcriptionally silenced after birth; reactivation occurs during vigorous hepatocyte regeneration or malignant transformation.
Differential Diagnosis
Elevated Levels (AFP High)
- •Hepatocellular carcinoma (HCC, often >400 ng/mL)
- •Non-seminomatous germ cell testicular tumors
- •Active viral hepatitis flare and liver regeneration
- •Neural tube defects in maternal screening
Low Levels (AFP Low)
- •Normal adult suppressed baseline (<5.0 ng/mL)
- •Complete oncological remission
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Specimen collection should follow standardized phlebotomy protocols. Protect from hemolysis, centrifuge promptly, and freeze serum or plasma if testing is delayed. Patient should be in a resting, fasting state where indicated.
Reflexive Testing Protocol:
- Confirmatory testing and secondary biomarker quantification for AFP
- Targeted organ system imaging or functional dynamic testing related to oncofetal antigen & hepatic regeneration
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Serum Alpha-Fetoprotein - The New England Journal of Medicine (2021). PMID: 33990124
- [2]AFP Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35222901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Serum Alpha-Fetoprotein (AFP) into overall healthspan optimization.