Spot Urine Sodium Estimation via Creatinine Normalization
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Solution Overview
Problem
Current methods for estimating sodium intake are cumbersome, inconvenient, and often inaccurate due to the need for 24-hour urine collections, which are prone to delays, incomplete sampling, and day-to-day variations in sodium intake, making it difficult to monitor sodium intake effectively for cardiovascular health.
Innovation Solution
A method using a single spot urine sample to estimate 24-hour sodium excretion by measuring chloride and creatinine concentrations, with normalized creatinine excretion values based on age, gender, race, weight, and other factors, allowing for accurate and convenient monitoring of sodium intake without the need for prolonged urine collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 24-hour urine collection is used to measure sodium excretion, then measurement accuracy is improved, but device complexity and ease of operation deteriorate due to cumbersome collection procedures
Solution Approach 1:
The invention extracts the essential measurement information (sodium-to-creatinine ratio) from a single spot urine sample, eliminating the need for complete 24-hour urine collection. This allows accurate sodium excretion estimation without the cumbersome collection procedure, resolving the contradiction between measurement accuracy and ease of operation.
Solution Approach 2:
The invention uses creatinine as an intermediary substance to indirectly measure sodium excretion. By measuring the sodium-to-creatinine ratio in a spot sample and applying population-based normalization factors, the method achieves 24-hour excretion accuracy without requiring actual 24-hour collection, thus improving ease of operation while maintaining measurement precision.
2Measurement precision
If 24-hour urine collection is required, then sodium excretion measurement is more accurate, but loss of time increases due to prolonged collection period
Solution Approach 1:
The invention extracts the critical measurement data from a single spot urine sample rather than requiring complete 24-hour collection. This extraction approach maintains measurement accuracy by focusing on the sodium-to-creatinine ratio while eliminating the time-consuming collection period, directly resolving the time-accuracy tradeoff.
3Ease of operation
If diet history is used to estimate salt intake, then ease of operation is improved, but measurement precision deteriorates due to unreliable subject estimation
Solution Approach 1:
The invention uses urinary creatinine as an intermediary marker that objectively reflects actual sodium excretion. Unlike subjective diet history, the creatinine-based measurement provides an objective, quantifiable indicator of sodium intake, thereby improving measurement precision while maintaining ease of operation through simple spot sample collection.
Data Source
AI summary
Methods and kits of the invention are useful for calculating 24-hour excretion of sodium without the need to collect urine for 24 hours.