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.
Specifications
| Specification | Detail |
|---|---|
| 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 |
| Hematuria screening | rapid detection of blood in urine in physician office or urgent care settings before imaging or microscopy |
| Urology practice routine screening | pre-cystoscopy and pre-imaging triage |
| Post-procedure monitoring | post-renal biopsy, post-lithotripsy, and post-catheterization follow-up |
Compare the Urine Reagent Strip Family
| Model | Tests | Pack |
|---|---|---|
| URS-01PR-BL77 (this model) | Blood | 100 / vial |
| URS-01PR-GL77 | Glucose | 100 / vial |
| URS-01PR-KE77 | Ketone | 100 / vial |
| URS-05PR-7777 | 5 parameters | 100 / vial |
| URS-10PR-7777 | 10 parameters | 100 / vial |
All: 60-second visual read, 100 strips per vial, ISO 13485 manufacturer.
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.
