Packed cell volume is commonly referred to as hematocrit and is a measure of the volume percentage of red blood cells in a blood sample. Other synonyms for packed cell volume include erythrocyte volume fraction, red cell volume, and hematocrit value. These terms all refer to the same measurement and are often used interchangeably in medical contexts. Hematocrit is commonly measured as part of a complete blood count and can provide important information about a person's overall health and the presence of certain conditions such as anemia or dehydration. Understanding the synonyms for packed cell volume can help to facilitate clear communication between healthcare providers and patients regarding their medical test results.