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Radioimmunoassay (RIA) is a scientific test that helps doctors and scientists measure very small amounts of things called “molecules” in our bodies.
Imagine that molecules are like tiny pieces of Lego that make up everything in our bodies, like muscles, bones, and even blood. Scientists want to measure how many of these Lego pieces are in our blood to check if we’re healthy or if we have any problems.
To do this, they use a special kind of Lego piece that has a tiny bit of radiation attached to it. This Lego piece is called a “radioactive tracer.”
Next, scientists put some of our blood into a test tube with some Lego pieces that stick to the molecule they want to measure. These Lego pieces are called “antibodies.”
The antibodies and radioactive tracer Lego pieces will compete to attach to the molecule being measured. After a while, scientists measure how much radiation is in the test tube. The more radiation there is, the less of the molecule being measured is in our blood.
So, in short, RIA is a test that uses special Lego pieces with radiation to measure how many molecules of a certain type are in our blood.
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