QCM : Blood Test Fundamentals for Nurses — 10 questions

Questions et réponses du QCM

1. What are Liver Function Tests (LFTs) primarily used for?

To assess kidney function and electrolyte balance.
To determine blood clotting ability and monitor anticoagulant therapy.
To measure blood sugar levels and diagnose diabetes.
To evaluate the health and function of the liver by measuring enzymes and bilirubin.

To evaluate the health and function of the liver by measuring enzymes and bilirubin.

Explication

Liver Function Tests (LFTs) are a group of blood tests that measure liver enzymes, bilirubin, and other substances to assess liver health and detect liver damage or disease. They are not related to blood sugar, kidney function, or clotting ability.

2. What does a Complete Blood Count (CBC) primarily evaluate in a patient?

Blood sugar levels.
Liver function.
Overall blood health including red and white cells, and platelets.
Electrolyte balance.

Overall blood health including red and white cells, and platelets.

Explication

The CBC measures red blood cells, white blood cells, hemoglobin, hematocrit, and platelets, providing a broad overview of blood health, unlike other tests focused on specific functions.

3. Which enzyme is specifically measured in Liver Function Tests (LFTs) to indicate liver inflammation or damage?

Aspartate aminotransferase (AST)
Alkaline phosphatase (ALP)
Alanine aminotransferase (ALT)
Bilirubin

Alanine aminotransferase (ALT)

Explication

ALT (alanine aminotransferase) is a liver enzyme measured in Liver Function Tests that indicates liver inflammation or damage when elevated. While AST and ALP are also part of LFTs, ALT is more specific to liver injury. Bilirubin is a pigment measured in LFTs to assess liver's ability to excrete bile, but it is not an enzyme. Therefore, ALT is the specific enzyme among the options that indicates liver inflammation or damage.

4. Which component in a CBC is responsible for oxygen transport?

White blood cells.
Hemoglobin.
Platelets.
Hematocrit.

Hemoglobin.

Explication

Hemoglobin is the oxygen-binding protein in red blood cells, crucial for oxygen transport, while white blood cells fight infection, platelets aid in clotting, and hematocrit indicates the volume of red blood cells.

5. What is the primary role of bilirubin measurement in liver function tests?

To assess the liver's capacity to process and excrete waste products
To determine the presence of inflammation in the liver tissue
To measure the level of liver enzymes indicating hepatocellular injury
To evaluate the liver's ability to produce clotting factors

To assess the liver's capacity to process and excrete waste products

Explication

Bilirubin measurement in liver function tests primarily assesses the liver's ability to process and excrete waste products. Elevated bilirubin levels can indicate liver dysfunction, bile duct obstruction, or hemolysis. It does not directly evaluate clotting factor production, enzyme levels, or inflammation, although these are also assessed by other components of LFTs.

6. A patient’s lab results show a low hematocrit level. Which condition might this suggest?

Dehydration.
Anemia.
Liver disease.
Hyperthyroidism.

Anemia.

Explication

Low hematocrit indicates a decreased proportion of red blood cells, commonly seen in anemia, which affects oxygen-carrying capacity, while dehydration typically elevates hematocrit.

7. What is the normal range of white blood cells in a CBC?

4,000–11,000 /µL.
1,000–4,000 /µL.
11,000–20,000 /µL.
20,000–40,000 /µL.

4,000–11,000 /µL.

Explication

Normal white blood cell count ranges from about 4,000 to 11,000 per microliter, which helps identify infections or immune disorders; the other ranges are outside typical values.

8. What does an increased white blood cell count in a CBC usually indicate?

An infection or inflammation.
Anemia.
Clotting disorder.
Liver failure.

An infection or inflammation.

Explication

Elevated white blood cells are often a response to infection or inflammation, serving as the body's defense mechanism, whereas anemia relates to red cells, and clotting issues involve platelets.

9. Which CBC component is used to evaluate blood's oxygen-carrying ability and can be affected in anemia?

Platelet count.
Hemoglobin.
White blood cell count.
Hematocrit.

Hemoglobin.

Explication

Both hemoglobin and hematocrit assess the blood's oxygen-carrying capacity; low levels suggest anemia, affecting oxygen delivery to tissues.

10. Why is it important for nurses to understand the normal ranges of CBC components?

To diagnose all conditions solely based on CBC.
To interpret results accurately and identify abnormalities early.
To replace the need for physician diagnosis.
To avoid ordering additional tests.

To interpret results accurately and identify abnormalities early.

Explication

Understanding normal ranges helps nurses interpret CBC results correctly, detect issues early, and support clinical decision-making, but diagnosis requires comprehensive assessment.

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Liver Function Tests — purpose?

Assess liver health and detect damage.

CBC — components?

RBC, hemoglobin, hematocrit, WBC, platelets.

ALT — role?

Indicates liver cell injury.

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