A nurse is reporting a client’s laboratory tests to the provider to obtain a prescription for the client’s daily warfarin.
Which of the following laboratory tests should the nurse plan to report to obtain the prescription for the warfarin?
INR
Fibrinogen level
aPTT
Platelet count
The Correct Answer is A
The correct answer is choice A. INR.
Warfarin is a vitamin K antagonist that inhibits the synthesis of factors II, VII, IX, and X in the liver.
These factors are part of the extrinsic and common pathways of coagulation, which are measured by the prothrombin time (PT) and the international normalized ratio (INR).
The INR is a standardized way of reporting the PT that accounts for the variability of different reagents and instruments.
The INR is used to monitor the therapeutic effect of warfarin and to adjust the dose accordingly.
The target INR range depends on the indication for warfarin, but it is usually between 2 and 3 for most conditions.
Choice B is wrong because fibrinogen level is not affected by warfarin.
Fibrinogen is a precursor of fibrin, which forms the final step of the coagulation cascade.
Fibrinogen level can be decreased in conditions such as disseminated intravascular coagulation (DIC), liver disease, or severe bleeding. Choice C is wrong because aPTT is not affected by warfarin.
aPTT measures the intrinsic and common pathways of coagulation, which are mainly dependent on factors VIII, IX, XI, and XII.
These factors are not inhibited by warfarin.
aPTT is used to monitor the effect of heparin, a direct antithrombin agent that inhibits thrombin and factor Xa.
Choice D is wrong because platelet count is not affected by warfarin.
Platelets are cell fragments that adhere to damaged blood vessels and form aggregates to initiate hemostasis.
Platelet count can be decreased in conditions such as immune thrombocytopenia (ITP), heparin-induced thrombocytopenia (HIT), or bone marrow suppression.
Normal ranges:
- INR: 0.8-1.2
- Fibrinogen: 200-400 mg/dL
- aPTT: 25-35 seconds
- Platelet count: 150-450 x 10^9/L References:
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
- Answer and explanation.
The correct answer is choice A. Increased Hct.
Hct stands for hematocrit, which is the percentage of red blood cells (RBCs) in the blood.
A client who received 2 units of packed RBCs should have an increased Hct because they have more RBCs in their blood volume. The normal range for Hct is 38% to 50% for males and 36% to 44% for females.
Choice B is wrong because decreased Hgb means decreased hemoglobin, which is the protein that carries oxygen in the RBCs.
A client who received 2 units of packed RBCs should have an increased Hgb because they have more hemoglobin in their blood. The normal range for Hgb is 13.5 to 17.5 g/dL for males and 12 to 15.5 g/dL for females.
Choice C is wrong because increased platelets means increased thrombocytes, which are the cells that help with blood clotting.
A client who received 2 units of packed RBCs should not have an increased platelet count because they did not receive platelets in the transfusion. The normal range for platelets is 150,000 to 400,000/mm^3.
Choice D is wrong because decreased WBC count means decreased leukocytes, which are the cells that fight infection and inflammation.
A client who received 2 units of packed RBCs should not have a decreased WBC count because they did not receive WBCs in the transfusion. The normal range for WBC count is 4,500 to 11,000/mm^3.
Correct Answer is D
Explanation
I will need to keep my hand elevated above my heart for several days.” This statement indicates that the client understands the importance of reducing swelling and inflammation in the affected hand after carpal tunnel surgery.
Elevation promotes venous return and prevents fluid accumulation in the tissues.
Choice A is wrong because applying heat for the first 24 hours can increase blood flow and swelling in the hand, which can cause more pain and delay healing. Ice packs are recommended for the first 24 to 48 hours to reduce inflammation.
Choice B is wrong because the client should not avoid using the affected hand for 4 to 6 weeks, as this can lead to stiffness, muscle atrophy, and decreased range of motion. The client should move the fingers periodically and perform gentle exercises as prescribed by the surgeon or physical therapist.
Choice C is wrong because numbness and tingling in the hand are signs of nerve compression, which is the main cause of carpal tunnel syndrome.
The client should expect these symptoms to improve or resolve after surgery, not persist or worsen. If the client experiences numbness and tingling after surgery, they should report it to the surgeon as it may indicate a complication such as nerve injury or hematoma.
Normal ranges for grip strength, pinch strength, and keypinch strength vary depending on age, sex, and hand dominance. However, a general reference for grip strength is 20 to 40 kg for men and 15 to 30 kg for women. For pinch strength, it is 6 to 12 kg for men and 5 to 10 kg for women. For keypinch strength, it is 4 to 8 kg for men and 3 to 7 kg for women.
These values may be lower in older adults or people with chronic conditions.
The client should expect some loss of strength in the affected hand after surgery, but it should gradually improve with rehabilitation.
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