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Glossary beginning with R

A glossary of terms.
Click one of the letters above to advance the page to terms beginning with that letter.


Red Blood Cells

Non nucleated cells that carry oxygen throughout the body.

Reference range

The lower and higher end of values considered normal for a laboratory test. All laboratory results which show counts at the lower or higher ends, or anywhere in between, are considered normal.


A second type of nucleic acid that is similar to DNA. The expression of genes encoded in DNA begins by their duplication into RNA molecules. RNA is less stable than DNA and is typically single-stranded.

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