milliequivalent
Definition
Noun: A unit of measurement equal to one thousandth (1/1000) of an equivalent, used primarily in chemistry and medicine to express the reactive capacity or combining power of a substance, especially electrolytes in biological fluids.
Usage
The term "milliequivalent" is used to quantify the amount of a substance based on its chemical combining power (its equivalent weight), rather than its simple mass. It is a standard unit in clinical and laboratory settings.
Examples
- The patient's serum potassium level was reported as 4.2 milliequivalents per liter.
- The intravenous solution contained 40 milliequivalents of sodium chloride.
- To calculate the dose, convert the grams of calcium to milliequivalents.
Advanced Usage
- Abbreviation: The standard abbreviation is mEq.
- Context: It is most commonly applied to ions like sodium (Na⁺), potassium (K⁺), chloride (Cl⁻), and calcium (Ca²⁺) in medical prescriptions, lab reports, and nutritional information.
- Calculation: The number of milliequivalents is calculated by dividing the mass in milligrams by the substance's equivalent weight.
Variants and Related Words
- Equivalent (n): The base unit, representing the amount of a substance that reacts with or supplies one mole of hydrogen ions (H⁺) or electrons.
- Millimole (n): A related but distinct unit of amount of substance (one thousandth of a mole), often used in conjunction with or instead of milliequivalents for univalent ions.
Synonyms
- mEq (n): The direct abbreviation and functional synonym in technical writing.
Notes
- The term is a compound noun formed from the prefix "milli-" (meaning one-thousandth) and "equivalent." It is always written as one word or as its abbreviation (mEq).
- It is a precise technical term with no idiomatic or phrasal verb uses.
Noun
-
one-thousandth of an equivalent
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