The value of cystoscopy as an initial diagnostic modality for asymptomatic microscopic hematuria

Cost-effectiveness of Common Diagnostic Approaches for Evaluation of Asymptomatic Microscopic Hematuria

IMPORTANCE

Asymptomatic microscopic hematuria (AMH) is highly prevalent and may signal occult genitourinary (GU) malignant abnormality. Common diagnostic approaches differ in their costs and effectiveness in detecting cancer. Given the low prevalence of GU malignant abnormality among patients with AMH, it is important to quantify the cost implications of detecting cancer for each approach.

OBJECTIVE

To estimate the effectiveness, costs, and incremental cost per cancer detected (ICCD) for 4 common diagnostic approaches evaluating AMH.

DESIGN, SETTING, AND PARTICIPANTS

A decision-analytic model-based cost-effectiveness analysis using inputs from the medical literature. PubMed searches were performed to identify relevant literature for all key model inputs, each of which was derived from the clinical study with the most robust data and greatest applicability. Analysis included adult patients with AMH on routine urinalysis with subgroups of high-risk patients (males, smokers, age ≥50 years) seen in the primary care or urologic referral setting.

INTERVENTIONS

Four diagnostic approaches were evaluated relative to the reference case of no evaluation: (1) computed tomography (CT) alone; (2) cystoscopy alone; (3) CT and cystoscopy combined; and (4) renal ultrasound and cystoscopy combined.

MAIN OUTCOMES AND MEASURES

At termination of the diagnostic period, cancers detected, costs (payer perspective), and ICCD per 10 000 patients evaluated for AMH.

RESULTS

Of the 4 diagnostic approaches analyzed, CT alone was dominated by all other strategies, detecting 221 cancers at a cost of $9 300 000. Ultrasound and cystoscopy detected 245 cancers and was most cost-effective with an ICCD of $53 810. Replacing ultrasound with CT detected just 1 additional cancer at an ICCD of $6 480 484. Ultrasound and cystoscopy remained the most cost-effective approach in subgroup analysis. The model was not sensitive to any inputs within the proposed ranges. Using probabilistic sensitivity analysis, ultrasound and cystoscopy was the dominant strategy in 100% of simulations.

CONCLUSIONS AND RELEVANCE

The combination of renal ultrasound and cystoscopy is the most cost-effective among 4 diagnostic approaches for the initial evaluation of AMH. The use of ultrasound in lieu of CT as the first-line diagnostic strategy will optimize cancer detection and reduce costs associated with evaluation of AMH. Given our findings, we need to critically evaluate the appropriateness of our current clinical practices, and potentially alter our guidelines to reflect the most effective screening strategies for patients with AMH.

Persistent, Asymptomatic, Microscopic Hematuria in Prospective Kidney Donors

BACKGROUND

Asymptomatic, microscopic hematuria is seen in 8-21% of the general population, has a good prognosis, and is generally not an indication for kidney biopsy. But whether it should preclude kidney donation is unclear.

METHODS

Of 512 consecutive prospective donors, 14 (2.7%) continued to have asymptomatic, microscopic hematuria over 1 month. If the medical history, physical examination, and computerized tomographic angiography were unremarkable, and if they still wished to donate, a kidney biopsy was performed.

RESULTS

In two prospective donors, hematuria resolved after treatment for urinary tract infection; two others declined donation and were referred to their primary care provider. Kidney biopsy in the remaining 10 showed: two normal; four thin basement membrane nephropathy (TBMN); one nonhomogeneous basement membrane abnormalities; one IgA nephropathy, 5 of 16 glomeruli globally sclerotic; one in a patient with a family history of Schimke's Syndrome, 7 of 30 glomeruli globally sclerotic; and one TBMN and early hypertensive changes without systemic hypertension. Only 4 of the 10 who underwent kidney biopsy donated (two normal, two TBMN).

CONCLUSIONS

Kidney abnormalities are common in young, otherwise healthy, prospective kidney donor candidates with persistent, asymptomatic, microscopic hematuria. A kidney biopsy is often abnormal and aids in the decision-making process.