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 D
Explanation
Answer and explanation.
The correct answer is choice D. Herpes zoster is a contraindication for receiving acupuncture treatment because it is an infectious skin disorder that can be transmitted by needles or contact with the affected area. Acupuncture should not be performed on areas of skin that are inflamed, ulcerated, or have sensory deficit.
Choice A is wrong because hypertension is not a contraindication for acupuncture. However, some caution is advised when needling points that may lower blood pressure, such as LI 4, LI 11, ST 36, and SP 6.
Choice B is wrong because hypothyroidism is not a contraindication for acupuncture. In fact, some studies suggest that acupuncture may have beneficial effects on thyroid function and symptoms of hypothyroidism.
Choice C is wrong because obesity is not a contraindication for acupuncture.
Acupuncture may help with weight loss by regulating appetite, metabolism, and hormones.
Some of the absolute contraindications for acupuncture include pregnancy (especially certain points that may induce labor or abortion), medical and surgical emergencies, malignant tumors, bleeding disorders, and use of a demand pacemaker. Some of the relative contraindications include drug or alcohol intoxication, lack of consent, immune deficiency, abnormal heart valves, and fear of needles.
Normal ranges for blood pressure are 120/80 mmHg or lower for systolic and diastolic pressure respectively.
Normal ranges for thyroid-stimulating hormone (TSH) are 0.4 to 4.0 mIU/L.
Normal ranges for body mass index (BMI) are 18.5 to 24.9 kg/m2.
Correct Answer is C
Explanation
Choice A reason:
"This test will be repeated when your baby is 2 months old. “This is a false statement. Newborn genetic screening is usually performed shortly after birth. The test is not typically repeated when the baby is 2 months old, as it is meant to detect conditions early on, allowing for prompt intervention and management if necessary.
Choice B reason:
"Your baby will be given 2 ounces of water to drink prior to the test."This is a false statement. The baby does not need to drink water before the newborn genetic screening test. The test is usually performed by collecting a small blood sample from the baby's heel, and there is no need for the baby to drink water beforehand.
Choice C reason:
"This test should be performed after your baby is 24 hours old. “This is the appropriate statement. The nurse should include the statement that newborn genetic screening should be performed after the baby is 24 hours old. Newborn genetic screening, also known as newborn screening or heel prick test, is a standard test performed on newborns to detect certain genetic, metabolic, and congenital disorders early on. The test is typically done by pricking the baby's heel to collect a small sample of blood, which is then analysed in a laboratory.
Choice D reason:
"A nurse will draw blood from your baby's inner elbow. “This is a false statement. The correct location for collecting the blood sample for newborn genetic screening is the baby's heel. The nurse will prick the baby's heel to obtain a few drops of blood, which will then be collected on a special filter paper for laboratory analysis.
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