Express 30 mg/dL of urea nitrogen as urea.

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Multiple Choice

Express 30 mg/dL of urea nitrogen as urea.

Explanation:
The key idea is converting urea nitrogen to total urea using molecular weights. Urea has a molecular weight of 60 g/mol, and nitrogen makes up 28 g/mol of that (two nitrogens). So the ratio of urea to its nitrogen portion is 60/28 ≈ 2.14. To express 30 mg/dL of urea nitrogen as urea, multiply by 2.14: 30 × 2.14 ≈ 64 mg/dL. This is why the urea value is about 64 mg/dL. If you instead used the fraction 28/60 ≈ 0.467, you’d get about 14 mg/dL, which corresponds to the nitrogen portion, not the total urea.

The key idea is converting urea nitrogen to total urea using molecular weights. Urea has a molecular weight of 60 g/mol, and nitrogen makes up 28 g/mol of that (two nitrogens). So the ratio of urea to its nitrogen portion is 60/28 ≈ 2.14. To express 30 mg/dL of urea nitrogen as urea, multiply by 2.14: 30 × 2.14 ≈ 64 mg/dL. This is why the urea value is about 64 mg/dL. If you instead used the fraction 28/60 ≈ 0.467, you’d get about 14 mg/dL, which corresponds to the nitrogen portion, not the total urea.

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