The calibrated device used to deliver a specified volume of patient sample when performing a blood chemistry analysis is known as a:

The calibrated device used to deliver a specified volume of patient sample when performing a blood chemistry analysis is known as a:

• A. Pipette
• B. Cuvette
• C. Graduated flask
• D. Graduated cylinder

Answer: (A)

Precise transfer of a defined volume is essential in blood chemistry because the assay depends on using the exact amount of sample or reagent to get an accurate result. The instrument designed for that purpose is a pipette. Pipettes allow you to aspirate and dispense a specific volume with high accuracy and precision, and you can use disposable tips to avoid cross-contamination. In blood chemistry, small volumes are common, and micropipettes or volumetric pipettes are chosen to match the needed precision. A cuvette is what you place the sample into for spectrophotometric measurement, not for delivering a precise volume. A graduated flask is used mainly for preparing solutions and general-volume work with less precision. A graduated cylinder measures larger volumes with moderate precision and is not suited for delivering the exact aliquots required in an assay.

Precise transfer of a defined volume is essential in blood chemistry because the assay depends on using the exact amount of sample or reagent to get an accurate result. The instrument designed for that purpose is a pipette. Pipettes allow you to aspirate and dispense a specific volume with high accuracy and precision, and you can use disposable tips to avoid cross-contamination. In blood chemistry, small volumes are common, and micropipettes or volumetric pipettes are chosen to match the needed precision.

A cuvette is what you place the sample into for spectrophotometric measurement, not for delivering a precise volume. A graduated flask is used mainly for preparing solutions and general-volume work with less precision. A graduated cylinder measures larger volumes with moderate precision and is not suited for delivering the exact aliquots required in an assay.