What test is used to detect microalbuminuria when albumin excretion is less than 300 mg per day?

What test is used to detect microalbuminuria when albumin excretion is less than 300 mg per day?

• A. Spot urine albumin-to-creatinine ratio
• B. Serum albumin
• C. Urine protein electrophoresis
• D. 24-hour urine collection

Answer: (A)

Detecting microalbuminuria requires a test that accurately picks up small amounts of albumin in urine and remains reliable despite differences in urine concentration. The spot urine albumin-to-creatinine ratio fits this need because it measures albumin relative to creatinine in a single urine sample, correcting for how dilute or concentrated the urine is. This makes it a sensitive, convenient way to detect microalbuminuria, typically defined as roughly 30 to 300 mg of albumin per day. Serum albumin reflects blood protein levels and not how much protein is being lost in the urine, so it isn’t useful for detecting microalbuminuria. Urine protein electrophoresis examines the specific types of proteins excreted and is not a routine screening test for low-level albuminuria. A 24-hour urine collection can quantify total protein or albumin excretion and is accurate, but it is cumbersome for regular screening compared with the spot albumin-to-creatinine ratio.

Detecting microalbuminuria requires a test that accurately picks up small amounts of albumin in urine and remains reliable despite differences in urine concentration. The spot urine albumin-to-creatinine ratio fits this need because it measures albumin relative to creatinine in a single urine sample, correcting for how dilute or concentrated the urine is. This makes it a sensitive, convenient way to detect microalbuminuria, typically defined as roughly 30 to 300 mg of albumin per day.

Serum albumin reflects blood protein levels and not how much protein is being lost in the urine, so it isn’t useful for detecting microalbuminuria. Urine protein electrophoresis examines the specific types of proteins excreted and is not a routine screening test for low-level albuminuria. A 24-hour urine collection can quantify total protein or albumin excretion and is accurate, but it is cumbersome for regular screening compared with the spot albumin-to-creatinine ratio.