Viability

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Viability

Viability means in general "capacity for survival" and is more specifically used to mean a capacity for living, developing, or germinating under favorable conditions. The word is specially used in the following contexts:

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viability in pregnancy
Pregnancy

Pregnancy is the carrying of one or more offspring, known as a fetus or embryo, inside the uterus of a female. In a pregnancy, there can be multiple gestations, as in the case of twins or Multiple birth....
refers to either:

an early stage pregnancy that has a chance of reaching full-term and a live birth (as opposed to, for example, an ectopic pregnancy
Ectopic pregnancy

An ectopic pregnancy is a complication of pregnancy in which the Fertilisationd ovum is implanted in any tissue other than the uterus wall. Most ectopic pregnancies occur in the Fallopian tube , but implantation can also occur in the cervix, ovary, and abdomen....
); or
the shortest length of pregnancy after which a child born
Childbirth

Childbirth is the culmination of a human pregnancy or gestation period with the delivery of one or more newborn infants from a woman's uterus. The process of normal human childbirth is categorized in three stages of labour: the shortening and dilation of the cervix, descent and delivery of the infant, and delivery of the placenta.....
prematurely
Premature birth

In humans, preterm birth refers to the birth of a baby of less than 37 weeks gestational age. Premature birth, commonly used as a synonym for preterm birth, refers to the birth of a premature infant....
has any chance of survival. Generally, this is from 20 weeks
Fetus

A fetus is a developing mammal or other viviparous vertebrate, after the embryonic stage and before childbirth. The plural is fetuses, or sometimes feti....
; or
Limit of viability
Limit of viability

The limit of viability is the gestational age at which a premature birth fetus/infant has a 50% chance of longterm survival outside its mother's womb....
which is the point at which 50% of delivered babies would survive, which is currently at 24 weeks.

viability in environmental conservation indicates the ability of a conservation target to persist for many generations or over long time periods.
viability of cells
Cell (biology)

The cell is the structural and functional unit of all known Life organisms. It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life....
and tissues
Biological tissue

Tissue is a cellular organizational level intermediate between cells and a complete organism. Hence, a tissue is an ensemble of cells, not necessarily identical, but from the same origin, that together carry out a specific function....
in experimental
Experiment

In scientific inquiry, an experiment is a method of investigating causal relationships among variables. An experiment is a cornerstone of the empiricism approach to acquiring data about the world and is used in both natural sciences and social sciences....
biology
Biology

Biology is a branch of the natural sciences concerned with the study of living organisms and their interaction with each other and their environment ....
refers to the extent to which those cells
Cell (biology)

The cell is the structural and functional unit of all known Life organisms. It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life....
and tissues
Biological tissue

Tissue is a cellular organizational level intermediate between cells and a complete organism. Hence, a tissue is an ensemble of cells, not necessarily identical, but from the same origin, that together carry out a specific function....
are living
Life

Life is a characteristic of organisms that exhibit certain biological processes such as chemical reactions or other events that results in a transformation....
. Varoiur testing methods can be usaed to determine cellular viability, including the MTT assay
MTT assay

The MTT assay and the MTS assay are Laboratory Tests and standard Colorimetry assays for measuring the activity of enzymes that reduce MTT or MTS + PMS to formazan, giving a purple color....
, CASY cell counting technology
CASY cell counting technology

Introduction CASY Technology is an electric field multi-channel cell counting system. It was first marketed by Sch?rfe System GmbH in 1998. In 2006, Sch?rfe System was acquired by Innovatis, a company focused on cell culture analysis....
, and using a Coulter counter
Coulter counter

A Coulter counter is an apparatus for counting and sizing particles and Cell s. It is used, for example, for bacteria or prokaryote and air quality particle size distributions....
.
viability in natural selection
Natural selection

Natural selection is the process by which favorable heritable trait become more common in successive generations of a population of Reproduction organisms, and unfavorable heritable traits become less common, due to differential reproduction of genotypes....
denotes the fraction of individuals that survive to a given age.
viability in economic development
Economic development

Economic development is the development of wealth of countries or regions for the well-being of their inhabitants. It is the process by which a nation improves the economic, political, and social well being of its people....
indicates the ability of benefits to cover costs in development projects.