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Which routine test for kidney function?
A Parkin1, H C Smith, J T Brocklebank
1Department of Medical Physics, St James's University Hospital, Leeds.
Insights
The height-to-creatinine ratio is the best initial screening test for detecting renal insufficiency in children. This simple test offers higher sensitivity and predictive value for normal results compared to other methods.
Area of Science:
- Pediatric Nephrology
- Renal Function Assessment
Background:
- Renal insufficiency in children requires early detection for timely intervention.
- Current screening methods for pediatric renal insufficiency have varying degrees of effectiveness.
Purpose of the Study:
- To evaluate the performance of plasma creatinine, height:creatinine ratio, and plasma beta 2 microglobulin as initial screening tests for renal insufficiency in children.
- To identify the most sensitive and predictive screening tool for pediatric renal insufficiency.
Main Methods:
- Eighty measurements were performed on 72 children with known renal disease.
- Tests included plasma creatinine concentration, height:creatinine ratio, and plasma beta 2 microglobulin concentration.
- Glomerular filtration rate was measured simultaneously using 51Cr edetic acid plasma clearance as a reference standard.
Main Results:
- The height:creatinine index demonstrated higher sensitivity and a better predictive value for normal results compared to plasma creatinine and plasma beta 2 microglobulin.
- A height:creatinine index less than 2.1 was identified as a key indicator.
Conclusions:
- The height:creatinine index is the preferred initial screening procedure for detecting renal insufficiency in children.
- This method offers a more reliable and accessible approach to identifying children with potential kidney problems.
Abstract:
Eighty measurements of plasma creatinine concentration, height:creatinine ratio, and plasma beta 2 microglobulin concentration were made on 72 children (age 4 months-18.5 years) with known renal disease. Results were compared with simultaneous measurements of glomerular filtration rate using plasma clearance of 51Cr edetic acid to assess the performance of each test as an initial screening procedure of renal insufficiency. Height:creatinine index less than 2.1 was found to have a higher sensitivity and predictive value of a normal result than the other tests and is therefore the preferred test for a screening procedure.