metabolic
Meaning of metabolic: One adjective covers energy use, inherited enzyme faults, acid balance and a cluster of risk factors, so context decides its meaning.
Definition of metabolic
Metabolic describes anything relating to metabolism, the chemical reactions that turn food into energy and into the building blocks cells need for growth and repair. In practice the word is a modifier rather than a diagnosis: it narrows a rate, a panel of blood tests, a disorder or a syndrome to the chemical machinery of the body rather than to any single organ.
Where does the word turn up?
| Phrase | What it means |
|---|---|
| Metabolic rate | How fast the body uses energy, usually quoted for a person at rest |
| Metabolic panel | A group of blood tests covering salts, kidney function and blood sugar, with liver measures added in the wider version |
| Metabolic disorder | A condition in which one chemical process runs wrongly, often an inherited enzyme fault present from birth |
| Metabolic acidosis | Acid building up in the blood for any reason other than a breathing problem |
| Metabolic syndrome | A cluster of findings that travel together and raise cardiovascular risk |
The common thread is chemistry rather than any one organ. In acid base language the word carries an extra shade of meaning: metabolic simply means not respiratory, which is why the two labels appear as a pair so often. The adjective also attaches to terms well outside mainstream practice, such as metabolic therapy and metabolic type, where its meaning is far looser and no agreed definition stands behind it.
What is metabolic syndrome?
It is a grouping rather than a disease. Excess fat carried around the abdomen, raised blood pressure, a fasting blood sugar above the normal range, high triglycerides and a low level of the protective form of cholesterol tend to occur together in the same person. Someone with several of them carries a higher risk of heart disease, stroke and type 2 diabetes than any of the findings would suggest alone, which is the entire point of naming the cluster. An older label for it was metabolic syndrome X. Resistance to the action of insulin appears to sit behind much of the clustering.
Why can a metabolic problem reach the whole body?
Because the reactions of metabolism run in every cell rather than in one place. A fault in a single enzyme can therefore produce a scattered set of effects at once: a substance that cannot be broken down accumulates and damages the brain, liver or kidneys, while the product it should have become goes missing somewhere else entirely. That is why inherited metabolic disease so often presents as an unlikely combination of symptoms, and why investigating it usually calls for a panel of tests rather than one.
Used in a sentence
The panel of laboratory tests was ordered to evaluate the patient's metabolic function.
Good to know
A metabolic disorder can affect several organ systems at the same time, which is why laboratory evaluation of suspected metabolic disease often extends well beyond a single blood test.
Word origin
Where “metabolic” comes from
Formed from Greek metabole, meaning change, reflecting the constant chemical transformation the term describes.