PT/INR, aPTT, BT, CT (via PFA-100), platelet count, and specific factor assays

Question 1

What is PT/INR? and what does it measure?

Answer 1

Prothrombin Time/International Normalized Ratio
The time it takes for blood to clot

Question 2

What does PT/INR bases its measurement on?

Answer 2

Extrinsic and common pathways

Question 3

PT/INR is used to monitor patients on which treatment?

Answer 3

Warfarin (Coumadin)

Question 4

PT/INR indicate deficiencies in which clotting factors?

Answer 4

I, II, V, VII, X

Question 4

PT/INR also help assessing in __ function, and detect __ __ deficiency and __ __ __

Answer 4

liver, vitamin K, disseminated vascular disease

Question 4

What is a normal INR value?

Answer 4

0.9 - 1.2

Question 5

What is accepted INR value for routine invasive dental tx in DMD clinic?

Answer 5

2.5 or less

Question 6

When INR value is higher, blood colts __, and when it is lower, blood clots __.

Answer 6

slower, faster.

Question 7

When should an INR be taken?

Answer 7

48 hours or less before proposed procedure

Question 8

__ is a device for INR measuring.

Answer 8

CoaguChek

Question 9

(T/F) All invasive and noninvasive tx require an INR check for indicated patients.

Answer 9

False. Diagnostic or non-invasive procedures may be accomplished without recent INR for pts. w/ long history of stable INR and no signs of easy bleeding/bruising

Question 10

What is aPTT? and what does it measure?

Answer 10

Activated Partial Thromboplastin Time
The time it takes for blood to clot

Question 11

What does aPTT bases its measurement on?

Answer 11

Intrinsic and common pathways