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NCLEX-RN Practice Exam 2
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Laboratory Test and Reference Range 
Hemoglobin
(Reference range: <5.0 mg/dL)
10.6 g/dL
Hematocrit
(Reference range: Female: 37%–47%; male: 42%–50%)
32%
Platelet count
(Reference range: 150,000–450,000 mm3)
385,000/mm3
White blood cell
(Reference range: 4,500–11,000 mm3)
19,100/mm3
Absolute neutrophil count (ANC)
(Reference range: 2,000–8,250 million/mcL)
4,500 million/mcL
Sodium
(Reference Range: 136–145 mEq/L)
126 mEq/L
Potassium
(Reference Range: 3.5–5.0 mEq/L)
3.3 mEq/L
Chloride, serum
(Reference Range: 98–106 mEq/L)
84 mEq/L
Bicarbonate
(Reference Range: 23–28 mEq/L)
23 mEq/L
Glucose, plasma
(Reference Range: 70–99 mg/dL)
127 mg/dL
Blood urea nitrogen (BUN)
(Reference Range: 8–20 mg/dL)
8 mg/dL
Creatinine, serum
(Reference Range: Female: 0.50–1.10 mg/dL; male: 0.70–1.30 mg/dL)
0.54 mg/dL
Calcium, serum
(Reference Range: 8.6–10.2 mg/dL)
8.8 mg/dL
Phosphorus, serum
(Reference Range: 3.0–4.5 mg/dL)
3.4 mg/dL
Uric acid, serum
(Reference Range: 3.0–7.0 mg/dL)
2 mg/dL
Thyroid-stimulating hormone (TSH), serum
(Reference Range: 0.5–4.0 mU/L)
3.5 mU/L
Osmolality, serum
(Reference Range: 275–295 mOsm/kg H2O)
268 mOsm/kg H2O
Osmolality, urine
(Reference Range: 38–1400 mOsm/kg H2O)
626 mOsm/kg H2O
Urine sodium
(Reference Range: 40–220 mEq/day)
126 mEq/L

Question 1of 3. Which of the following medical conditions should the nurse suspect the client is experiencing?


Answer Options

Hint : 💦Watch for low sodium with concentrated urine and low serum osmolality.

Correct Answers:

  • Syndrome of inappropriate antidiuretic hormone


Rationale :

💧The client’s low sodium (126 mEq/L), low serum osmolality (268 mOsm/kg), and high urine sodium (126 mEq/L) are consistent with SIADH, which leads to water retention and dilutional hyponatremia.

🧪The normal ANC and elevated WBC suggest no neutropenic infection, and other labs do not support adrenal or pituitary disorders.

🌊SIADH is commonly associated with small cell lung cancer and the paraneoplastic syndrome it induces.

🩺Adrenal insufficiency would show low sodium too but usually with high potassium, which is not seen here.

📌Core Message

SIADH causes dilutional hyponatremia and is common in small cell lung cancer.

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