Table 3 Frequency of different attributes of the oral anticoagulation knowledge (OAK) Test, N = 200

1

Missing one dose of Coumadin (warfarin)

b. Can alter the drug’s effectiveness

115 (57.5)

85 (42.5)

2

You can distinguish between different strengths of Coumadin (warfarin) tablets by what?

a. Color

151 (75.5)

49 (24.5)

3

A patient on Coumadin (warfarin) therapy should contact the physician or healthcare provider who monitors it when:

d. All the above

105 (52.5)

95 (47.5)

4

Occasionally eating a large amount of leafy greens vegetables while taking Coumadin (warfarin) can:

b. Reduce the effectiveness of the Coumadin (warfarin)

91 (45.5)

109 (54.5)

5

Which of the following vitamins interacts with Coumadin (warfarin)?

d. Vitamin K

86 (43)

114 (57)

6

When is it safe to take a medication that interacts with Coumadin (warfarin)?

b. If your healthcare provide is aware of the interaction and checks your PT/INR (“Protime”) regularly

102 (51)

98 (49)

7

The PT/INR (“Protime”) test is:

a. A blood test used to monitor your Coumadin (warfarin) therapy

156 (78)

44 (22)

8

Coumadin (warfarin) may be used to:

a. Treat people that already have a blood clot

164 (82)

36 (18)

9

A patient with a PT/INR (“Protime”) value below their “goal range”:

b. Is at an increase the risk of having a clot

98 (49)

102 (51)

10

Taking a medication containing aspirin or other non-steroidal anti-inflammatory medications such as ibuprofen (Motrin^®/Advil^®) while on Coumadin (warfarin) will:

b. Increase your risk of bleeding from the Coumadin (warfarin)

98 (49)

102 (51)

11

A person on Coumadin (warfarin) should seek immediate medical attention:

b. If they notice blood in their stool when going to the bathroom

111 (55.5)

89 (44.5)

12

Skipping even one dose of your Coumadin (warfarin) can:

c. Cause your PT/INR(“Protime”) to be below the “goal range”

103 (51.5)

97 (48.5)

13

Drinking alcohol while taking Coumadin (warfarin):

b. May affect your PT/INR (“Protime”)

117 (58.5)

83 (41.5)

14

Once you have been stabilized on the correct dose of Coumadin (warfarin), about how often should your PT/INR(“Protime”) value be tested?

b. Once a month

98 (49)

102 (51)

15

It is important for a patient on Coumadin (warfarin) to monitor for signs of bleeding:

b. At all times

99 (49.5)

101 (50.5)

16

The best thing to do if you miss a dose of Coumadin (warfarin) is to?

b. Take the next scheduled dose and tell your healthcare provider

118 (59)

82 (41)

17

When it comes to diet, people taking Coumadin (warfarin) should:

c. Be consistent and eat a diet that includes all types of food

107 (53.5)

93 (46.5)

18

Each time you get your PT/INR (“Protime”) checked, you should

d. Let your doctor know if you missed any doses of Coumadin (warfarin)

91 (45.5)

109 (54.5)

19

Which of the following over-the-counter products is most likely to interact with Coumadin (Warfarin)?

b. Herbal/dietary supplements

113 (56.5)

87 (43.5)

20

A patient with aPT/INR (“Protime”) value above the “goal range”:

c. Is at an increased risk of bleeding

119 (59.5)

81 (40.5)