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 {"dropdown-group-1":"A","dropdown-group-2":"B"}
Explanation
The nurse should recognize the client is experiencing preterm labor due to previous preterm birth.
Preterm labor is when regular contractions begin to open the cervix before 37 weeks of pregnancy. One of the risk factors for preterm labor is having a previous preterm delivery. The client’s history indicates that her last pregnancy resulted in a preterm spontaneous vaginal birth at 30 weeks gestation. The client’s current symptoms, such as lower back pain, pinkish vaginal discharge, uterine contractions and cervical dilation, also suggest that she is in preterm labor. Therefore, the nurse should recognize that the client is experiencing preterm labor due to previous preterm birth.
BMI, blood type and blood pressure are not causes of preterm labor in this case. BMI may be associated with preterm labor if it is too high or too low, but the client’s BMI is within the normal range for pregnancy. Blood type may cause Rh incompatibility if the mother is Rh negative and the baby is Rh positive, but the client’s blood type is Rh positive. Blood pressure may cause preeclampsia if it is too high, but the client’s blood pressure is normal. Abruptio placentae is a condition where the placenta separates from the uterine wall before delivery, which can cause vaginal bleeding, abdominal pain and fetal distress. The client does not have these signs.
Correct Answer is A
Explanation
Choice A reason:
Measuring the arm circumference above the insertion site daily is appropriate. When planning care for a client scheduled to receive a peripherally inserted central catheter (PICC) in the arm, it is appropriate for the nurse to include measuring the arm circumference above the insertion site daily. This intervention is essential to monitor for any signs of complications, such as edema or swelling, which could indicate thrombosis or infiltration at the insertion site.
Choice B reason:
Administering sedation Administering sedation is not a routine intervention for a PICC insertion procedure is inappropriate. Sedation might be considered for certain procedures, but it is not typically used for PICC insertions. PICC insertions are generally performed with local anaesthesia at the insertion site.
Choice C reason:
Scheduling an MRI post procedure to verify placement An MRI is not typically used to verify the placement of a PICC. The placement of a PICC is usually confirmed using X-ray or other imaging methods that can visualize the catheter's location within the central veins. Post-procedure verification of PICC placement is essential to ensure proper positioning and to prevent complications.
Choice D reason:
Using gauze to secure an arm board to the involved extremity Using gauze to secure an arm board to the involved extremity is not a common practice for securing a PICC. After a PICC insertion, a securement device specifically designed for PICCs is typically used to secure the catheter in place and prevent movement.
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