Phlebotomy : Skin Puncture: Microhematocrit and Hemoglobin

How deep does a lancet puncture the skin?

• “1 to 2 millimeters”

• “2 to 4 millimeters”

• “5 to 8 millimeters”

A centrifuge separates blood into which three layers?

• “Red blood cells, buffy coat, and plasma”

• “Red blood cells, white blood cells, and plasma”

• “Red blood cells, white blood cells, and platelets”

• “Red blood cells, buffy coat, and white blood cells.”

What type of blood is collected during a skin puncture?

• “Capillary blood”

• “Venous blood”

• “Arterial blood”

Why should two tubes be placed in the centrifuge during a microhematocrit?

• “To keep the centrifuge balanced”

• “To keep the tubes from breaking”

• “To measure both red blood cells and white blood cells”

• “To offer a control test”

When using a lancet, how should the puncture be positioned on the finger?

• “Across the grain of the fingerprint”

• “Parallel to the grain of the fingerprint”

Where are skin punctures usually performed on an infant?

• “Fingers”

• “Heels”

• “Earlobes”

• “Wrist”

What is the most common location for a skin puncture?

• “Fingers”

• “Heels”

• “Earlobes”

• “Wrist”

What does a hematocrit measure?

• “The volume of red blood cells in the blood”

• “The number of red blood cells in the blood”

• “The weight of red blood cells in the blood”

Why is hemoglobin important to the body?

• “It carries oxygen to the body cells and carbon dioxide away.”

• “It removes plaque from the inside of arteries.”

• “It removes excess chemicals from the bloodstream.”

• “It fights microorganisms that invade the body.”

What test is most-often ordered to measure the patient's red blood cell volume.

• “Hematocrit”

• “Hemoglobin”

• “H & H”