alpha fetoprotein
Học thuậtThân thiện
Definition
Noun: * A protein produced by the fetal liver and yolk sac: Alpha-fetoprotein (AFP) is a substance normally present in high levels in the blood of a developing fetus. Its levels decrease after birth. In adults, elevated levels can be associated with certain liver diseases or cancers.
Usage
Alpha-fetoprotein is primarily used as a medical and biological term. * It is commonly discussed in the contexts of prenatal screening, oncology, and hepatology. * It is often abbreviated as AFP. * It is typically used as a non-count noun (e.g., levels of alpha-fetoprotein) but can be countable when referring to the molecule itself in technical contexts.
Examples
- Prenatal Screening:
- Medical Diagnosis:
- Research Context:
Advanced Usage
- Biomarker: In clinical practice, alpha-fetoprotein is a crucial serum biomarker. Its quantification is essential for diagnosis and monitoring.
- Example: The patient's alpha-fetoprotein levels are being tracked as a biomarker for treatment response.
- Oncofetal Antigen: Alpha-fetoprotein is classified as an oncofetal antigen because it is produced by fetal tissues and re-expressed by some types of tumors.
- Example: Like carcinoembryonic antigen, alpha-fetoprotein is a well-characterized oncofetal antigen.
Variants and Related Words
- AFP: The standard abbreviation for alpha-fetoprotein.
- Alpha-fetoprotein test: A specific test to measure AFP levels.
- Fetoprotein: The broader category of fetal proteins to which AFP belongs.
Synonyms
- AFP (the standard abbreviation, often used interchangeably in medical contexts).
- α-fetoprotein (an alternative spelling using the Greek letter alpha).
Related Phrases and Concepts
- Elevated AFP: A key phrase indicating levels above the normal reference range, which triggers further diagnostic investigation.
- Example: An elevated AFP in a non-pregnant adult warrants investigation of the liver.
- AFP-L3: A specific lectin-bound fraction of AFP that is used as a more specific biomarker for hepatocellular carcinoma.
- Neural tube defect screening: The primary clinical application of maternal AFP testing.
Noun
- an abnormally large amount of this fetoprotein in the fetus can signal an abnormality of the neural tube (as spina bifida or anencephaly)