Which two measurements are required to calculate the albumin:creatinine ratio in urine?

Which two measurements are required to calculate the albumin:creatinine ratio in urine?

• A. Urine pH and SG
• B. Albumin and Creatinine
• C. Glucose and Protein
• D. Ketones and Creatinine

Answer: (B)

The test hinges on measuring how much albumin is being excreted in urine and how much creatinine is being excreted in the same sample, then forming a ratio of those two values. Albumin concentration tells you the amount of albumin present, but urine concentration can vary with hydration. Creatinine, excreted at a relatively steady rate, serves as an internal standard to account for that dilution. By dividing albumin by creatinine, you get an albumin:creatinine ratio that is more reliable across spot urine samples. So you need the albumin measurement and the creatinine measurement in urine to calculate this ratio. The other options don’t provide both of these essential measurements (they either omit albumin or omit creatinine, or mix in unrelated substances), so they won’t yield the ACR.

The test hinges on measuring how much albumin is being excreted in urine and how much creatinine is being excreted in the same sample, then forming a ratio of those two values. Albumin concentration tells you the amount of albumin present, but urine concentration can vary with hydration. Creatinine, excreted at a relatively steady rate, serves as an internal standard to account for that dilution. By dividing albumin by creatinine, you get an albumin:creatinine ratio that is more reliable across spot urine samples.

So you need the albumin measurement and the creatinine measurement in urine to calculate this ratio. The other options don’t provide both of these essential measurements (they either omit albumin or omit creatinine, or mix in unrelated substances), so they won’t yield the ACR.