LW Scientific URS-01PR-BL77 Blood Urine Reagent Strips | 100/Vial

The LW Scientific URS-01PR-BL77 is a single-parameter blood urine reagent test strip for professional clinical use that screens for the presence of blood — both intact erythrocytes and free hemoglobin — in urine, delivering a colorimetric result in 60 seconds. Manufactured by LW Scientific, Inc., an ISO 13485-certified laboratory equipment company, the blood reagent pad uses hemoglobin's native peroxidase activity to catalyze a color-producing oxidation reaction — the established urine occult blood detection chemistry used in clinical laboratories worldwide. Each sealed vial contains 100 individual single-use reagent strips. This product is designated for professional use only and must not be used as an at-home or over-the-counter test.

Features & Benefits

• Peroxidase-based blood detection — detects both intact erythrocytes (producing a characteristic speckled pad pattern) and free hemoglobin and myoglobin (producing a uniform color change), providing comprehensive hematuria and hemoglobinuria screening
• 60-second visual read — results read directly from the on-vial color reference chart
• For professional use only — designated for clinical laboratory and near-patient testing environments by qualified healthcare professionals
• 100 strips per vial — economical format for high-volume hematuria screening workflows
• ISO 13485-certified manufacturer — consistent reagent quality under a certified IVD quality management system

Specifications

Intended Use & Applications

For professional clinical use only in qualified laboratory and near-patient testing settings. Applications include:

• Hematuria screening — rapid detection of blood in urine in physician office or urgent care settings before imaging or microscopy
• Kidney disease monitoring — renal pathologies including glomerulonephritis, nephrolithiasis, IgA nephropathy, and polycystic kidney disease can present with microscopic or gross hematuria
• Urology practice routine screening — pre-cystoscopy and pre-imaging triage
• Post-procedure monitoring — post-renal biopsy, post-lithotripsy, and post-catheterization follow-up
• High-volume single-parameter hematuria screening workflows — when blood is the sole clinical question, the single-parameter format delivers maximum cost efficiency

Usage Instructions

1. Collect a fresh urine specimen in a clean, dry container. Mix the specimen well before testing. Do not centrifuge. Test within 4 hours of voiding.
2. Remove one strip. Replace the cap immediately.
3. Briefly dip the reagent pad fully in urine, then remove immediately.
4. Run the strip edge against the container rim. Hold horizontally.
5. Compare pad color to the on-vial chart at 60 seconds. A speckled pattern indicates intact erythrocytes; uniform color change indicates free hemoglobin or myoglobin.

Volume Discounts

LabSupplies.com offers below retail pricing on multi-vial orders of LW Scientific URS-01PR-BL77 blood strips for urology practices, nephrology clinics, and hospital laboratories. Contact us for institutional volume pricing.

Frequently Asked Questions

What is the difference between a speckled and uniform color change on the blood pad?

A speckled or dotted pattern on the reagent pad indicates the presence of intact erythrocytes (red blood cells) that have lysed locally on the pad. A uniform color change indicates free hemoglobin in solution (hemoglobinuria) or myoglobin (myoglobinuria). Both patterns are clinically significant and warrant follow-up evaluation.

What causes false-positive results?

Contaminating bacteria that produce peroxidase enzymes can yield false positives, particularly in specimens with poor collection technique. Residual peroxide-containing cleaning agents in the collection container can also produce false positives. Using a midstream clean-catch collection technique minimizes contamination-related false positives.

What causes false-negative results?

High concentrations of ascorbic acid (vitamin C) are a well-documented inhibitor of the blood pad reaction and can produce false-negative results. Captopril and other reducing agents at high concentration can also inhibit the reaction. Note ascorbic acid supplementation when interpreting blood pad results.

When should I use the full 10-parameter strip instead?

When hematuria is detected or suspected, a comprehensive urinalysis is often clinically indicated to assess the underlying etiology — including protein (glomerular leak), specific gravity (concentration), nitrite and leukocytes (concurrent UTI), and pH. The LW Scientific URS-10PR-7777 10-parameter strip delivers the full urinalysis panel in a single dip.