The LW Scientific URS-01PR-KE77 is a single-parameter ketone urine reagent test strip that screens for the presence of ketone bodies — acetoacetic acid and acetone — in urine, delivering a colorimetric result in 60 seconds. Manufactured by LW Scientific, Inc., an ISO 13485-certified laboratory equipment company, the ketone reagent pad uses the sodium nitroprusside reaction (Legal's test) in an alkaline medium to produce a violet color proportional to ketone concentration — the established gold-standard chemistry for urine ketone detection. Each sealed vial contains 100 individual single-use reagent strips suitable for both clinical urinalysis and ketogenic diet monitoring applications.
Specifications
| Specification | Detail |
|---|---|
| 60-second visual read | simple violet color comparison to on-vial chart; deeper violet indicates higher ketone concentration |
| 100 strips per vial | generous supply for extended daily monitoring programs or multi-patient clinical workflows |
| ISO 13485-certified manufacturer | produced under a rigorous certified IVD quality management system |
| Clinical ketonuria screening | detection of ketonuria in diabetic patients, fasting patients, and patients with suspected metabolic disorders |
| Pregnancy ketonuria screening | hyperemesis gravidarum and inadequate caloric intake can cause clinically significant ketonuria |
| Starvation and malnutrition assessment | ketonuria indicates active fat catabolism from caloric deprivation |
Compare the Urine Reagent Strip Family
| Model | Tests | Pack |
|---|---|---|
| URS-01PR-BL77 | Blood | 100 / vial |
| URS-01PR-GL77 | Glucose | 100 / vial |
| URS-01PR-KE77 (this model) | 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.
Applications
LabSupplies.com serves clinical practices, wellness programs, nutrition coaches, and institutional buyers ordering LW Scientific URS-01PR-KE77 ketone strips.
Frequently Asked Questions
Why does the strip detect acetoacetic acid more sensitively than acetone?
The sodium nitroprusside chemistry reacts preferentially with acetoacetic acid (detection threshold: 10 mg/dL) over acetone (50 mg/dL). Beta-hydroxybutyrate — the predominant ketone body in deep ketosis and advanced DKA — is NOT detected by this method. For monitoring deep ketosis or confirming DKA, a blood beta-hydroxybutyrate meter provides a more complete picture alongside urine strip screening.
Can keto diet followers use these strips reliably?
Yes — with important context. LW Scientific specifically endorses the URS-01PR-KE77 for low-carb and ketogenic dieters monitoring ketone output in urine. These are an economical way to confirm dietary ketosis, especially in the early weeks of a ketogenic diet. Note that as the body adapts to ketosis over weeks to months, urine ketone excretion naturally decreases as tissues use ketones more efficiently — a trace or negative urine result does not necessarily indicate failed ketosis in adapted individuals.
What can cause false-positive results?
Residual peroxide-containing cleaning agents left in the collection container can produce false-positive reactions with the nitroprusside reagent. Certain medications including mesna and other thiol-containing compounds may also react. Replace caps immediately and do not use formaldehyde as a urine preservative.
When would I upgrade to the 10-parameter strip instead?
If ketone screening in a clinical context raises concern for DKA or underlying metabolic disease, a complete urinalysis is clinically indicated. The LW Scientific URS-10PR-7777 10-parameter strip tests ketone alongside glucose, pH, protein, blood, and five additional analytes in a single 60-second dip.
