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Blood Clotting Tests Quiz

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Questions and Answers

What is the normal value for Prothrombin Time (PT) using the Whole Blood Method?

15-18 sec.

10-12 sec. (correct)

12-15 sec.

7-10 sec.

Why is PT an important test for patients receiving warfarin therapy?

To evaluate Extrinsic and Common Pathways (correct)

To assess Factor XIII levels

To monitor platelet function

To measure red blood cell count

What does the International Normalized Ratio (INR) measure?

Platelet function

Hemoglobin levels

Sensitivity of the PT reagent (correct)

Red blood cell count

How does a prolonged PT (>12 sec.) indicate a deficiency?

Extrinsic and Common Pathway deficiency (A) Signup and view all the answers

What does ISI stand for in the context of PT reagents?

International Sensitivity Index (A) Signup and view all the answers

Why is Factor XIII not detected using both Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT)?

Because PT and APTT are not sensitive to FXIII deficiency (A) Signup and view all the answers

What is the primary function of Simplastin in the PT test?

Replace tissue factor in the thromboplastin (A) Signup and view all the answers

How does INR relate to the sensitivity of a PT reagent?

Lower INR indicates higher reagent sensitivity (D) Signup and view all the answers

Why is it important to compute INR in modern PT tests?

To standardize PT results across different laboratories (A) Signup and view all the answers

What is the normal value for Prothrombin Time (PT) using the Capillary Tube Method in minutes?

7-15 min (C) Signup and view all the answers

Which of the following is NOT a equipment used in the Extrinsic and Common Pathway Test of Choice?

microscope slide (A) Signup and view all the answers

What is the normal INR range as mentioned in the text?

2.0 - 3.0 (D) Signup and view all the answers

Which component is NOT part of Simplastin reagent for Prothrombin Time (PT) testing?

heparin (C) Signup and view all the answers

What does ISI represent in the context of PT reagents?

International Standardized Index (A) Signup and view all the answers

Why is Factor XIII deficiency hard to detect using PT and APTT tests?

Factor XIII deficiency does not affect coagulation times measured by PT and APTT tests (D) Signup and view all the answers

What happens when the ISI of a PT reagent is closer to 1?

The reagent becomes more sensitive (B) Signup and view all the answers