A–Z Glossary

Pre-analytic variables

Pre-analytic variables are factors before a test sample is collected that can change the result.

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Patient preparation for medical tests

Patient preparation for medical tests

Why preparation matters Many people think of preparation as a comfort issue, but it is often a measurement issue. Laboratory analytes can shift after food intake, dehydration, exercise, nicotine exposure, alcohol use, or medication changes. If those factors are not controlled, a test can look abnormal even when nothing clinically significant has changed, or it […]