Quality Assessment Creatinines in Plasma and Urine
|Chronic Kidney Disease|
|Study Design:||Time Perspective: Cross-Sectional|
|Official Title:||Quality Assessment of Creatinines in Plasma and Urine|
- To investigate the bias and precision between routine laboratory techniques to measure creatinine in plasma, urine and dialysate when compared to the gold standard to measure creatinine. [ Time Frame: 6 months (plasma, urine and dialysate samples are collected only once during the running of the study) ]Creatinine concentrations of plasma, urine and/or dialysate samples will be measured using different techniques applied in daily clinical practice (jaffe, enzymatic and HPLC). For each participant creatinine will also be measured using the gold standard measure LC-MS. LCMS values will be used as reference method against which routine methods will be compared by means of absolute bias and precision per method group. Absolute bias is the mean difference between SCr values measured by individual laboratories and SCr target values; precision is defined as the SD of the absolute bias.
Biospecimen Retention: Samples Without DNA
|Study Start Date:||June 2010|
|Study Completion Date:||January 2011|
|Primary Completion Date:||January 2011 (Final data collection date for primary outcome measure)|
Patients coming for creatinine clearance
For this single group study, all patients presenting at the laboratory facility for a 24-hour creatinine clearance and patients in the dialysis population of the Isala Clinics who came for their periodical KT/V control, were informed about the study and asked to participate. Moreover, 20 'healthy' volunteers (including the investigators of this study and staff working at the clinical chemistry department of the Isala clinics) participated in this study.
Apart from the 24-hour creatinine clearance, also formulas to estimate the glomerular filtration rate (GFR) are increasingly used to get an impression from renal function in recent years. Based on these renal function measurements, clinical decisions are made as well as drug dose adjustments. The use of reliable serum creatinine measurements is therefore important to get accurate renal function estimates. However, serum creatinine is one of the most variable routine laboratory tests.
The importance of calibration to a traceable reference measurement of serum creatinine has been stressed. However, this standardization does not correct for analytical non-specificity problems, which occurs in certain techniques to measure creatinine, leading to under- or overestimation of the true creatinine concentration.
The aim of this cross-sectional observational study is to examine the degree of variability between diverse methods to measure creatinine in plasma and urine in a heterogenous group of Caucasian people with and without renal function loss and the influence hereof on the 24-hour creatinine clearance and the Modification of Diet in Renal Disease study equation and the consequences for chronic kidney disease staging.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01575392
|Principal Investigator:||I Drion, MD||Diabetes Centre, Isala Clinics, Zwolle, the Netherlands|
|Study Director:||Henk JG Bilo, Prof||Diabetes Centre, Isala Clinics, Zwolle, the Netherlands|