Aliquot Preparation Quiz

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What is the purpose of wearing gloves when handling blood specimens?

To increase dexterity

To keep the hands warm

To prevent contamination (correct)

To improve grip

Why is it important to leave the stoppers on the tubes before and during centrifugation?

To observe the separation process

To reduce the spinning speed

To prevent contamination and pH changes (correct)

To improve accuracy of the balance

What is the purpose of balancing tubes in a centrifuge?

To ensure even spinning of the centrifuge (correct)

To reduce the need for anticoagulants

To prevent tubes from breaking

To speed up the centrifugation process

When should a plasma specimen collected in tubes with anticoagulants be centrifuged?

Immediately and without delay Signup and view all the answers

Why does serum specimen need to be completely clotted prior to centrifugation?

To avoid interference with test results Signup and view all the answers

Why are gauze or tissue used to cover the stoppers of tubes during centrifugation?

To catch drops of blood or aerosol Signup and view all the answers

What is the purpose of preparing an aliquot of specimen?

To transfer a portion of a sample specimen for chemical analysis Signup and view all the answers

Why is it important not to put specimens with different anticoagulants in the same aliquot tube?

To ensure accurate test results Signup and view all the answers

What should be done to a serum sample before centrifugation?

Allow it to completely clot Signup and view all the answers

Which component distinguishes serum from plasma during processing?

Fibrinogen Signup and view all the answers

How should tube stoppers be removed during specimen processing?

By pulling straight up and off the tube Signup and view all the answers

What is the purpose of covering a tube as soon as it is filled during aliquot preparation?

To protect the sample from contamination Signup and view all the answers

Why does a plasma sample not require clotting time compared to whole blood?

Plasma samples do not contain cellular components that can cause clotting. Signup and view all the answers

What are the main characteristics of specimens that affect testing results?

Hemolysis, icterus, and turbidity Signup and view all the answers

What is the recommended storage temperature for most samples to ensure stability?

-4°C Signup and view all the answers

Why should samples be properly capped before storage or testing?

To prevent contamination from external factors like light and heat. Signup and view all the answers

How long can samples be stored if frozen at -20°C?

Longer periods Signup and view all the answers

Why is it important for health workers to avoid rapid airflow near specimens?

To minimize the effects of evaporation on samples. Signup and view all the answers