American Association of Critical-Care Nurses (AACN) Certification Practice Test

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What is the normal range for urine osmolality?

100-250 mOsm/kg
250-900 mOsm/kg
900-1200 mOsm/kg
150-300 mOsm/kg

The correct answer is: 250-900 mOsm/kg

The normal range for urine osmolality is indeed approximately 250-900 mOsm/kg. This value is crucial as it reflects the kidney's ability to concentrate or dilute urine based on the body's hydration status and solute load. In a healthy individual, urine osmolality can vary widely throughout the day depending on fluid intake, physical activity, and various physiological conditions. The kidneys adjust urine concentration to maintain homeostasis, which is why you can see a range that encompasses these values. Understanding urine osmolality is important in clinical practice because it helps in evaluating a patient’s hydration status and kidney function. Deviations from this range can provide insights into conditions such as dehydration, psychogenic polydipsia, or renal concentrating disorders.