A nurse is reviewing the laboratory results for a client who is taking warfarin following orthopedic surgery.
Which of the following results should the nurse report to the provider?
PT 15.5 seconds (11 to 12.5 seconds).
aPTT 45 seconds (30 to 40 seconds).
INR 5.2 (0.8 to 1.1).
Platelet count 90,000/mcL (150,000 to 400,000/mcL).
The Correct Answer is C
Choice A rationale
A prothrombin time (PT) of 15.5 seconds, while slightly above the normal range of 11 to 12.5 seconds, indicates a mild prolongation of clotting time. For a client on warfarin, a slight elevation in PT is often expected as it reflects the anticoagulant effect. This value alone may not necessitate immediate reporting.
Choice B rationale
An activated partial thromboplastin time (aPTT) of 45 seconds, slightly above the normal range of 30 to 40 seconds, indicates a minor prolongation in the intrinsic and common pathways of coagulation. While relevant for heparin therapy, its direct significance for warfarin's primary monitoring is less critical.
Choice C rationale
An International Normalized Ratio (INR) of 5.2 is significantly elevated above the therapeutic range for most conditions, which is typically 2.0 to 3.0 for clients on warfarin. An INR of 5.2 indicates a high risk of bleeding complications due to excessive anticoagulation, requiring immediate provider notification. Normal range is 0.8 to 1.1.
Choice D rationale
A platelet count of 90,000/mcL is below the normal range of 150,000 to 400,000/mcL, indicating thrombocytopenia. While important for hemostasis, warfarin primarily affects clotting factors, not platelet production. However, a low platelet count combined with high INR further increases bleeding risk, necessitating reporting.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Blood glucose monitoring accuracy is generally not directly affected by hydrochlorothiazide. The medication's impact is on glucose metabolism itself, not the accuracy of the measurement device. Hydrochlorothiazide affects the pancreatic beta cells or peripheral insulin sensitivity, leading to altered glucose homeostasis, not erroneous readings from a glucometer.
Choice B rationale
Decreasing insulin dosage is generally not appropriate when taking hydrochlorothiazide. Hydrochlorothiazide, a thiazide diuretic, can induce hyperglycemia by impairing insulin secretion from the pancreatic beta cells or by reducing peripheral glucose utilization, thereby requiring an *increase* in insulin dosage to maintain glycemic control, not a decrease.
Choice C rationale
Hydrochlorothiazide therapy can elevate blood glucose levels in clients who have diabetes. This effect is attributed to the medication's ability to impair insulin secretion from pancreatic beta cells or to decrease peripheral glucose utilization, leading to insulin resistance. This necessitates careful blood glucose monitoring (normal fasting glucose <100 mg/dL).
Choice D rationale
Reducing sodium in the diet while taking hydrochlorothiazide is beneficial for blood pressure control by augmenting the diuretic's effects, but it does not directly control blood glucose levels. While a healthy diet supports overall health, the primary mechanism of glucose elevation from hydrochlorothiazide is metabolic, not sodium-related.
Correct Answer is A
Explanation
Choice A rationale
Somatropin is a synthetic growth hormone used to treat growth hormone deficiency. The primary therapeutic effect of this medication is to promote linear growth in children. Therefore, monitoring the child's height monthly is a direct and quantifiable measure to evaluate the effectiveness of somatropin therapy and ensure that the child is achieving the expected growth velocity.
Choice B rationale
While thyroid function can influence growth, and growth hormone deficiency can sometimes coexist with or impact thyroid axis, evaluating the therapeutic effect of somatropin directly involves assessing growth. Monitoring thyroid function is important for overall endocrine health but is not the primary measure for the therapeutic effect of somatropin itself, assuming thyroid function is within normal limits (e.g., TSH 0.4-4.0 mIU/L, free T4 0.8-1.8 ng/dL).
Choice C rationale
Checking the child's sodium level regularly is not a direct measure of the therapeutic effect of somatropin. Growth hormone can influence fluid balance, but sodium levels (normal range 135-145 mEq/L) are primarily monitored for hydration status or potential adverse effects like fluid retention, not as an indicator of growth hormone's efficacy in promoting growth.
Choice D rationale
Measuring the child's abdominal girth is a measure of abdominal circumference, primarily used to assess abdominal distention, fluid accumulation, or changes in visceral fat. It is not a relevant parameter for evaluating the therapeutic effect of somatropin, which is specifically aimed at stimulating linear bone growth and overall somatic growth.
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