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Microalbuminuria: frequency and clinical significance in hospital patients
W D McDearmon1, Z K Shihabi, S L Key
1Department of Pathology, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, NC.
Abstract:
We investigated the frequency and the clinical significance of microalbuminuria (UA) in 312 hospital patients suspected of renal disorders, but with normal or borderline levels of urinary total protein (UTP). Approximately one-third of the patients with urinary total protein < 300 mg/g creatinine had microalbuminuria, above the reference interval (< 32 mg/g creatinine). In contrast, only 10% of the patients with elevated total urinary protein above the reference interval (> 200 mg/g creatinine) did not have microalbuminuria. About half of the patients with elevated UA had diabetes mellitus, hypertension, an immune-related disorder, or had undergone a recent renal transplant. About half of the patients with borderline elevated UTP (100 to 300 mg/g creatinine) did not have any obvious renal problem. These data demonstrate that: 1) microalbuminuria occurs very commonly in hospital patients, 2) it is a more sensitive and specific assay for the early detection of many renal disorders compared to urinary total protein, especially when the latter test is normal or borderline elevated; and 3) a thorough patient history is required for interpretation of microalbuminuria in diabetes to eliminate other complicating factors.
Insights
Microalbuminuria (UA) is common in hospital patients with suspected kidney issues. It is a more sensitive marker for early renal disorder detection than total urinary protein (UTP), especially with normal or borderline UTP levels.
Area of Science:
- Nephrology
- Clinical Chemistry
Background:
- Microalbuminuria (UA) is a key indicator of early kidney damage.
- Urinary total protein (UTP) is a standard marker, but its sensitivity can be limited in early-stage renal disorders.
Purpose of the Study:
- To investigate the frequency and clinical significance of microalbuminuria in hospital patients with suspected renal disorders.
- To compare the diagnostic utility of UA versus UTP in detecting renal abnormalities.
Main Methods:
- Analysis of UA and UTP levels in 312 hospital patients with suspected renal disorders.
- Correlation of UA and UTP findings with patient history, including diabetes, hypertension, immune disorders, and renal transplant status.
Main Results:
- Approximately one-third of patients with UTP < 300 mg/g creatinine exhibited microalbuminuria (> 32 mg/g creatinine).
- Only 10% of patients with elevated UTP (> 200 mg/g creatinine) lacked microalbuminuria.
- Half of patients with elevated UA had comorbidities like diabetes or hypertension; half with borderline UTP had no apparent renal issues.
Conclusions:
- Microalbuminuria is highly prevalent in hospitalized patients with suspected renal conditions.
- UA is a more sensitive and specific marker than UTP for early renal disorder detection, particularly when UTP is normal or borderline.
- Clinical interpretation of UA, especially in diabetic patients, necessitates a comprehensive patient history to account for confounding factors.