The nurse is caring for a client who is being evaluated for possible deep vein thrombosis of the right extremity. Which laboratory result is of most concern to the nurse?
Activated Partial Thromboplastin Time (aPTT) of 25.
D-dimer of 500 ng/mL.
Prothrombin Time (PT) of 14 seconds.
Platelet count of 148,000 uL.
The Correct Answer is B
Choice A rationale
Activated Partial Thromboplastin Time (aPTT) of 25 is within the normal range (25-35 seconds) and is not directly related to deep vein thrombosis (DVT)89.
Choice B rationale
A D-dimer level of 500 ng/mL is elevated (normal range is typically less than 250 ng/mL), which can indicate the presence of a clot, such as in DVT8910.
Choice C rationale
Prothrombin Time (PT) of 14 seconds is within the normal range (11-13.5 seconds) and is not directly related to DVT89.
Choice D rationale
A platelet count of 148,000 uL is within the normal range (150,000-450,000 uL) and is not directly related to DVT89.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
The hemoglobin A1C test, also known as the HbA1C or glycated hemoglobin test, is a blood test that evaluates glycemic control over a 3-month period by measuring the glucose attached to hemoglobin. This test is commonly used to diagnose and monitor diabetes. It provides an average of your blood sugar levels over the past 2-3 months, which can help healthcare providers assess how well diabetes is being managed.
Choice B rationale
The hemoglobin A1C test does not use the level of serum protein to evaluate glycemic control. Instead, it measures the amount of glucose that is attached to the hemoglobin in your red blood cells.
Choice C rationale
The hemoglobin A1C test does not evaluate serum ketone production over several days. Ketones are produced when the body burns fat for energy, which can occur when there is not enough insulin to help your body use sugar for energy. High levels of ketones can lead to diabetic ketoacidosis, a serious condition that requires immediate medical attention.
Choice D rationale
The hemoglobin A1C test does not determine the amount of glucose attached to hemoglobin over the last seven days. Instead, it provides an average of your blood sugar levels over the past 2-3 months. -
Correct Answer is D
Explanation
Step 1 is to understand the therapeutic range for aPTT when a patient is on heparin therapy. The therapeutic range for aPTT is 1.5 to 2.5 times the normal value. Given that the normal aPTT value is around 30-40 seconds, the therapeutic range would be approximately 45-100 seconds. Therefore, an aPTT value of 75 seconds falls within this therapeutic range, indicating that the heparin therapy is effective.
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