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Prothrombin Time Quiz

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Questions and Answers

What is the normal range of Prothrombin Time (PT) and what does a prolonged PT indicate?

Normal PT range is 12 to 16 seconds and a prolonged PT indicates an excess of coagulation factors.

Normal PT range is 12 to 16 seconds and a prolonged PT indicates a deficiency in coagulation factors. (correct)

Normal PT range is 9 to 13 seconds and a prolonged PT indicates a deficiency in coagulation factors.

Normal PT range is 9 to 13 seconds and a prolonged PT indicates an excess of coagulation factors.

What is the International Normalised Ratio (INR) and what does a high INR indicate?

INR measures the ratio of a patient's PT to standardised 'normal' PT and a high INR indicates high risk of clotting. (correct)

INR measures the ratio of a patient's PT to standardised 'normal' PT and a high INR indicates high risk of bleeding.

INR measures the ratio of a patient's PT to standardised 'abnormal' PT and a high INR indicates high risk of bleeding.

INR measures the ratio of a patient's PT to standardised 'abnormal' PT and a high INR indicates high risk of clotting.

What is the D-dimer test and what does a negative result indicate?

D-dimer test measures the levels of the fibrin protein in blood clots and a negative result rules out thrombosis.

D-dimer test measures the levels of the D-dimer protein in blood clots and a negative result indicates thrombosis.

D-dimer test measures the levels of the D-dimer protein in blood clots and a negative result rules out thrombosis. (correct)

D-dimer test measures the levels of the fibrin protein in blood clots and a negative result indicates thrombosis.

Study Notes

Coagulation Tests

Prothrombin Time (PT): Normal range is 11-13.5 seconds (varies between labs)
Prolonged PT (>13.5 seconds) indicates:
- Liver disease (e.g., cirrhosis, hepatitis)
- Vitamin K deficiency
- Warfarin therapy (blood thinner)
- Blood clotting disorders (e.g., hemophilia)

International Normalised Ratio (INR)

INR: Standardized ratio of PT to a normal PT value
High INR (>1.1) indicates:
- Warfarin therapy (blood thinner)
- Liver disease (e.g., cirrhosis, hepatitis)
- Vitamin K deficiency

Fibrinolysis Test

D-dimer test: Measures breakdown products of blood clots
Negative D-dimer result indicates:
- No blood clotting or fibrinolysis (e.g., no DVT, PE, or AF)

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Description

Test your knowledge on Prothrombin Time with this quiz! Learn about the normal range and factors involved in blood clotting, including VII, X, V, prothrombin, and fibrinogen. Discover how a prolonged PT can indicate a deficiency in these coagulation factors. Challenge yourself to see how much you know about this important medical test.