A 48-year-old woman in an inpatient psychiatric hospital complains of polyuria and polydipsia. The patient was admitted to the hospital 1 year ago and was diagnosed wit
A 48-year-old woman in an inpatient psychiatric hospital complains of polyuria and polydipsia. The patient was admitted to the hospital 1 year ago and was diagnosed with bipolar affected disorder which has been treated with lithium.
Plasma analysis:
Sodium: 150 mEq/L (normal 135 – 145 mEq/L)
Potassium: 4.8 mEq/L (normal 3.5 – 5.0 mEq/L)
Chlroide: 115 mEq/L (normal 101 – 112 mEq/L)
pH: 7.48 (normal 7.31-7.41)
Osmolarity: 320 mOsm/kg (normal 275 – 293 mOsm/kg)
Urinalysis:
Urine Osmolarity: 200 mOsm/kg (normal 100 – 900 mOsm/kg)
24-hour sample: 4.8 L (normal less than 2 L/24 hr))
Question: In a healthy individual with a plasma osmolarity of 320 mOsm/kg, what is the expected urine osmolarity?
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