Urine samples collected in the morning from housebroken dogs tend to be:

Urine samples collected in the morning from housebroken dogs tend to be:

• A. The most concentrated samples
• B. Unacceptable for sediment analysis
• C. Bright orange
• D. The least concentrated samples

Answer: (A)

Morning urine is most concentrated because the dog has gone several hours without drinking, and the kidneys conserve water during the night. This means the urine produced during sleep is left to be voided in the morning with a high solute content, giving it the highest specific gravity among samples collected that day. So the first morning sample tends to be the most concentrated. Urine color and suitability for sediment analysis vary with diet, medications, and hydration, but the general rule is that overnight, not-yet-diluted urine from the morning is the most concentrated, not the least.

Morning urine is most concentrated because the dog has gone several hours without drinking, and the kidneys conserve water during the night. This means the urine produced during sleep is left to be voided in the morning with a high solute content, giving it the highest specific gravity among samples collected that day. So the first morning sample tends to be the most concentrated. Urine color and suitability for sediment analysis vary with diet, medications, and hydration, but the general rule is that overnight, not-yet-diluted urine from the morning is the most concentrated, not the least.