A nurse is providing teaching to the parent of a child who has a new diagnosis of scabies.
Which of the following information should the nurse include?

Choice A rationale

Biopsy of the tumor is the definitive diagnostic procedure for Wilms tumor. This involves the surgical removal of a tissue sample from the suspected mass, which is then examined microscopically by a pathologist. Histopathological analysis confirms the presence of malignant cells characteristic of nephroblastoma, differentiating it from other renal masses and guiding subsequent treatment protocols. Normal renal tissue structure is preserved in healthy kidneys.

Choice B rationale

Bone marrow aspiration is primarily used to diagnose hematological malignancies or assess for metastatic disease in certain cancers. While Wilms tumor can metastasize, particularly to the lungs, bone marrow involvement is uncommon and not the primary diagnostic method for confirming the initial diagnosis of the tumor itself. Normal bone marrow contains hematopoietic stem cells and a balanced cellularity.

Choice C rationale

A CT scan of the abdomen and chest provides detailed anatomical information about the tumor's size, location, and extent of involvement within the kidney and surrounding structures, as well as checking for metastasis to the lungs. While crucial for staging and surgical planning, a CT scan is an imaging modality and does not provide a definitive tissue diagnosis. Normal abdominal organs appear with distinct densities.

Choice D rationale

Abdominal ultrasonography is often the initial imaging modality used to evaluate a suspected abdominal mass in children due to its non-invasive nature and lack of radiation exposure. It can identify the presence of a renal mass and distinguish between solid and cystic lesions, but like CT, it cannot definitively diagnose Wilms tumor without tissue sampling. Normal kidneys appear as solid, homogeneous organs.

Choice A rationale

Adjusting levothyroxine dosage daily based on blood levels is generally not appropriate due to the drug's long half-life, which necessitates stable drug concentrations before accurate assessment. Frequent adjustments risk inducing fluctuations in thyroid hormone levels, potentially leading to hyperthyroidism or continued hypothyroidism and making precise titration challenging for maintaining euthyroid state.

Choice B rationale

Remaining on the initial dosage throughout treatment is highly improbable for levothyroxine. Thyroid hormone replacement therapy requires individualized dosing due to variations in patient metabolism, weight, and the severity of hypothyroidism. Regular monitoring of thyroid stimulating hormone (TSH) levels is essential to titrate the dose, ensuring optimal therapeutic effect and avoiding complications.

Choice C rationale

Starting levothyroxine at a high dosage is contraindicated, particularly in older adults or those with cardiovascular comorbidities, due to the risk of precipitating adverse cardiac events such as arrhythmias or angina. High doses can overwhelm the cardiovascular system, demanding increased metabolic activity. Gradual titration minimizes these risks and allows for physiological adaptation.

Choice D rationale

Starting on a low dosage and gradually increasing levothyroxine is the standard and safest approach. This strategy allows the body to adapt to the exogenous thyroid hormone, minimizing the risk of adverse effects like cardiac arrhythmias, particularly in sensitive individuals. Gradual titration prevents rapid metabolic shifts and allows for careful monitoring of patient response and TSH levels.