Question 1

Which of the following is a primary benefit of using capillary blood collection over venipuncture in pediatric patients?

Accepted Answer

It reduces the risk of iatrogenic anemia and nerve damage.

Question 2

Which laboratory test should NOT be performed using capillary blood due to the risk of dilution with interstitial fluid?

Accepted Answer

Coagulation studies

Question 3

A capillary blood sample is a mixture of which of the following components?

Accepted Answer

Blood from arterioles, venules, capillaries, and interstitial fluids

Question 4

Why is it important to control the depth of incision during a skin puncture, especially in infants?

Accepted Answer

To avoid hitting bone and causing infection

Question 5

Which site is preferred for capillary blood collection in adults?

Accepted Answer

Fleshy, central palmar surface of the distal phalanx of the third or fourth finger

Question 6

A patient requires a blood smear for manual WBC differential. Which of the following steps is essential for preparing an acceptable smear?

Accepted Answer

Wipe away the first drop of blood before making the smear

Question 7

Which of the following is a reason to avoid using the fifth (pinky) finger for capillary blood collection?

Accepted Answer

It has thinner tissue and a higher risk of hitting bone

Question 8

What is the main reason for not using iodine tincture to cleanse the skin puncture site?

Accepted Answer

It can falsely elevate potassium, phosphorus, or uric acid results

Question 9

Which of the following best describes the order of collection for capillary blood specimens after the first drop is removed?

Accepted Answer

Blood gases, EDTA tubes, other additive tubes, then nonadditive tubes

Question 10

A capillary blood sample is collected for glucose and potassium measurement. Which of the following statements is correct regarding the expected results compared to venous blood?

Accepted Answer

Glucose will be higher and potassium will be lower in capillary blood.

Question 11

Which of the following actions during capillary blood collection can cause hemolysis of the specimen?

Accepted Answer

Excessive milking or massaging of the finger

Question 12

A laboratory receives a capillary blood sample for a CBC. Which tube should be used for collection?

Accepted Answer

A tube containing EDTA

Question 13

Which of the following is a contraindication for performing a capillary puncture?

Accepted Answer

The patient is severely dehydrated.

Question 14

Why should the puncture site be warmed before collecting a capillary blood sample for blood gas analysis?

Accepted Answer

To increase arterial blood flow and improve accuracy

Question 15

Which of the following is a correct step in the procedure for collecting a capillary blood specimen?

Accepted Answer

Discard the first drop of blood unless collecting for point-of-care glucose testing.

Question 16

A patient with a history of bilateral mastectomy requires capillary blood collection. What is the best course of action?

Accepted Answer

Consult with the physician before selecting a site.

Question 17

Which of the following supplies is essential for preparing a blood smear from a capillary sample?

Accepted Answer

Glass microscope slide

Question 18

What is the recommended depth for a skin puncture in adults?

Accepted Answer

$$2-3 	ext{ mm}$$

Question 19

Which of the following is a common error that can result in an unusable blood smear?

Accepted Answer

Using a chipped slide

Question 20

A capillary tube for microhematocrit should be filled to what proportion of its length?

Accepted Answer

At least two-thirds full

Capillary or Dermal Blood Specimens: Principles and Procedures

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