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QuestionAnatomy and Physiology

KNOWLEDGE DRILL 10 - 3:TRUE/FALSE ACTIVITY The following statements are all false. Circle the one or two words that make the statement false and write the correct word/s that would make the statement true in the space provided. 1. Microhematocrit tubes are often referred to as "bullets" because of their size and shape. 2. Warming a capillary puncture site can increase blood flow up to 10 times. 3. Capillary puncture is sometimes recommended when available veins are fragile or must be saved for other procedures such as a glucose tolerance test. 4. Except for POCT methods, blood specimens for glucose tests cannot be collected by capillary puncture. 5. Microtubes for chemistry specimens are collected first in the order of draw for capillary puncture. 6. The CLSI recommended site for capillary puncture on adults and children older than 1 year is the palmar surface of the distal or end segment of the middle or ring finger of the dominant hand. 7. The safest area for heel puncture is the medial or lateral palmar surface of the heel. 8. Neonatal bilirubin specimens must be kept cool during transportation and handling. 9. Phenylketonuria is a temporarily acquired disorder. 10. Blood spot circles for newborn screening tests are filled by applying a large drop of free-flowing blood to each side of the filter paper.

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Step 1
: Review statement 1.

Statement 1: Microhematocrit tubes are often referred to as "bullets" because of their size and shape. Explanation: The statement is false because microhematocrit tubes are not referred to as "bullets" due to their size and shape. They are called microhematocrit tubes because of their use in the microhematocrit centrifugation method for measuring hematocrit values.

Step 2
: Review statement 2.

Statement 2: Warming a capillary puncture site can increase blood flow up to 10 times. Explanation: The statement is false because warming a capillary puncture site can only increase blood flow by approximately 50%. The misconception arises from the idea that a more substantial increase in blood flow occurs, but the actual increase is more moderate.

Final Answer

1. Microhematocrit tubes 2. 10 times (should be approximately 50%) 5. Microtubes for chemistry specimens 7. The palmar surface (should be the plantar surface) 10. Blood spot circles for newborn screening tests

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