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Am J Kidney Dis. 2011 Jul;58(1):19-28. doi: 10.1053/j.ajkd.2010.12.026. Epub 2011 Mar 15.

Diagnostic accuracy of urine dipsticks for detection of albuminuria in the general community.

Author information

1
George Institute for Global Health, Sydney, Australia. swhite@george.org.au

Abstract

BACKGROUND:

Urine dipsticks, an inexpensive accessible test for proteinuria, are widely advocated for mass screening; however, their diagnostic accuracy in the general community is largely unknown.

STUDY DESIGN:

Evaluation of diagnostic test accuracy in a cross-sectional cohort.

SETTING & PARTICIPANTS:

AusDiab, a representative survey of Australian adults 25 years and older (conducted in 1999/2000). Stratified cluster random sampling from 11,247 individuals participating in the biomedical examination; complete urinalysis data available for 10,944.

INDEX TEST:

Urine dipsticks (Bayer Multistix), with a positive result defined as ≥1+ or trace or higher protein.

REFERENCE TEST:

Albumin-creatinine ratio (ACR), measured on a random spot urine sample. Reference test positivity was defined as ACR ≥30 mg/g or ACR ≥300 mg/g.

RESULTS:

Numbers of participants with ACR <30, 30-300, and ≥300 mg/g were 10,219 (93.4%), 634 (5.8%), and 91 (0.8%), respectively. The area under the receiver operating characteristic curve (AUC) for dipstick detection of ACR ≥30 mg/g was 0.8451 ± 0.0129 (SE) in men and 0.7775 ± 0.0131 in women (P < 0.001). The AUROC for dipstick detection of ACR ≥300 mg/g was 0.9904 ± 0.0030 in men and 0.9950 ± 0.0016 in women (P = 0.02). Dipstick result ≥1+ identified ACR ≥30 mg/g with 57.8% sensitivity (95% CI, 54.1%-61.4%) and 95.4% specificity (95% CI, 95.0%-95.8%) and identified ACR ≥300 mg/g with 98.9% sensitivity (99% CI, 92.1%-100%) and 92.6% specificity (99% CI, 92.0%-93.3%). A dipstick result of trace or higher identified ACR ≥30 mg/g with 69.4% sensitivity (95% CI, 65.9%-72.7%) and 86.8% specificity (95% CI, 86.1%-87.4%) and identified ACR ≥300 mg/g with 100% sensitivity (99% CI, 94.3%-100%) and 83.7% specificity (99% CI, 82.8%-84.6%). A negative dipstick result (less than trace) had a negative predictive value of 97.6% (95% CI, 97.2%-97.9%) for ACR ≥30 mg/g and a negative predictive value of 100% (99% CI, 99.9%-100%) for ACR ≥300 mg/g. The probability of an ACR ≥30 mg/g confirmed on laboratory investigation was 47.2% (95% CI, 43.9%-50.5%) based on a dipstick result ≥1+ and 27.1% (95% CI, 25.1%-29.2%) based on a trace or higher result.

LIMITATIONS:

Isolated urine samples precluded assessment of test reproducibility. Urine specific gravity and pH were not recorded; therefore, the effect of urine concentration on test performance was not assessed.

CONCLUSIONS:

A dipstick test result <1+ or less than trace has a high negative predictive value in the general community setting, with minimal risk of a missed diagnosis of macroalbuminuria. High false-positive rates emphasize the need for laboratory confirmation of positive results.

PMID:
21411199
DOI:
10.1053/j.ajkd.2010.12.026
[Indexed for MEDLINE]

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