EF

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ejection fraction (EF)

the fraction of the total ventricular filling volume that is ejected during each ventricular contraction. The normal EF of the left ventricle is 65%.

EF

Abbreviation for ejection fraction.

fraction

(frak'shon) [L. fractio, act of breaking]
1. In biological chemistry, the separable part of a substance such as blood or plasma.
2. The ratio of a component to the total, e.g., the substance fraction of carboxyhemoglobin (relative to the total hemoglobin).

attributable fraction

The percentage of instances of an illness that can be accounted for by a particular risk factor. For example, people exposed to asbestos have a certain risk of developing lung cancer, and if they also smoke tobacco, they are also at risk from that factor. These risks may be estimated from cohort studies.
Synonym: additional risk; attributable risk

carboxyhemoglobin fraction

The percentage of total hemoglobin in a blood sample that is covalently bonded to carbon monoxide.

ejection fraction

Abbreviation: EF
In cardiac physiology, the percentage of the blood emptied from the ventricle during systole. The left ventricular ejection fraction averages 60% to 70% in healthy hearts but can be markedly reduced if part of the heart muscle dies (as after myocardial infarction) or in cardiomyopathy or valvular heart disease.

immature platelet fraction

Abbreviation: IPF
The percent of platelets found in the circulating blood that still retains RNA. It is elevated (greater than 12%) in diseases in which platelets are rapidly destroyed after their release from the bone marrow, e.g., disseminated intravascular coagulation (DIC), idiopathic thrombocytopenic purpura (ITP), and thrombotic thrombocytopenic purpura (TTP). These diseases can be distinguished from other thrombocytopenic conditions in which platelet regeneration is slower, e.g., aplastic anemia, liver failure, or kidney failure, because the IPF is usually less than 12% in diseases characterized by bone marrow inactivity or suppression. The IPF is determined using flow cytometry.

fraction of inspired oxygen

Abbreviation: Fio2
The concentration of oxygen in the inspired air, esp. that supplied as supplemental oxygen by mask or catheter.

mass fraction

The ratio of the mass of a constituent to the total mass of the system in which the constituent is contained.

methemoglobin fraction

The fraction of the hemoglobin in the blood in which ferrous iron has been oxidized to ferric iron.

oxyhemoglobin fraction

F O2Hb
That portion of hemoglobin present in a sample of blood that is reversibly bound to oxygen.

plasma protein fraction

A standard sterile preparation of serum albumin and globulin obtained by fractionating blood, serum, or plasma from healthy human donors and testing for absence of hepatitis B surface antigen. It is used as a blood volume expander.

substance fraction

The ratio of the amount (number of moles or entities) of a constituent of a mixture to the total of constituents of the system.
See: mass fraction

volume fraction

The ratio of the volume of a constituent to the volume of the whole. In practice, it may be difficult to determine the volume fraction because differences in the molecular sizes of the constituents may produce a total volume that differs from the sum of the individual volumes of the mixture. When materials of similar physicochemical characteristics (such as multiple aqueous solutions) are combined, this is not a problem.

ejection fraction

Abbreviation: EF
In cardiac physiology, the percentage of the blood emptied from the ventricle during systole. The left ventricular ejection fraction averages 60% to 70% in healthy hearts but can be markedly reduced if part of the heart muscle dies (as after myocardial infarction) or in cardiomyopathy or valvular heart disease.
See also: fraction

EF

elongation factor.
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