Creatinine (Enzymatic)

A Highly Sensitive & Reproducible Method

Benefits of the Randox Enzymatic Creatinine Assay

Superior Performance

Superior method

The Randox enzymatic method offers a superior specificity when compared to the traditional Jaffe method.

Precision

Excellent precision

The Randox creatinine assay displayed a within run precision of < 2.18% CV.

Correlation

Exceptional correlation

The Randox enzymatic creatinine assay displayed a correlation coefficient of at least r=0.99 when compared to commercially available methods.

Limited Interference

Limited interferences

The Randox enzymatic creatinine assay suffers minimal interferences from Bilirubin, Haemoglobin, Intralipid® and Triglycerides, for truly accurate results and ensures suitability with paediatric samples.

Calibrator & Controls

Calibrator and controls available

Calibrator and controls available offering a complete testing package.

Applications available

Applications available detailing instrument-specific settings for the convenient use of the Randox enzymatic creatinine assay on a variety of clinical chemistry analysers.

  • Ordering Information
  • Methodology
  • Physiological Significance
  • Renal Function
  • Diabetes
  • COVID-19
Cat NoSize    
CR2336R1 4 x 50ml (S)
R2 4 x 10ml
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CR2337R1 4 x 100ml (S)
R2 4 x 20ml
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CR4037R1 4 x 50ml (L)
R2 4 x 19.5ml
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CR8122R1 4 x 65ml (L)
R2 4 x 32.3ml
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(L) Indicates liquid option (S) Indicates standard included in kit

Instrument Specific Applications (ISA’s) are available for a wide range of biochemistry analysers.  Contact us to enquire about your specific analyser.

The Laboratory Working Group of the National Kidney Disease Education Program (NKDEP) released guidelines for the improvement of glomerular filtration rate (GFR) estimation as well as the measurement of serum creatinine (SCr). The recommendation included the recalibration and standardisation of SCr methods to be traceable to the isotope dilution-mass spectrometry (IDMS) reference method. Two IDMS traceable creatinine methods are commercially available: enzymatic assays and compensated Jaffe assays 1.

Of the two enzymatic assays available, the Randox enzymatic creatinine assay converts creatinine to ammonia (NH3) and I-Methylhydantoin. Ammonia then reacts with α-oxoglutarate in the presence of GLDH with oxidation of the co-enzyme NADPH. The decrease of NADPH is proportional to the creatinine concentration and is measured at 340nm 1, 2.

The Randox enzymatic creatinine assay exhibits high sensitivity and reproducibility with the added advantage of liquid ready-to-use reagents with good stability. The enzymatic method represents an improvement for use in the accurate and reliable determination of creatinine.

Creatinine is the end-product of muscle catabolism of creatine. In humans, creatinine production is relatively stable, but mainly depends on muscles mass. Consequently, any physiological changes in muscle mass will cause a variation in the creatinine pool independently of GFR changes. Creatinine is freely filtered by the glomerulus at a constant rate with 10% to 40% secreted by the tubules 1.

According to the National Institutes of health, the overall prevalence of chronic kidney disease (CKD) is approximately 14% 3. Creatinine is the most commonly utilised assay in the assessment of renal function 4. The National Kidney Disease Education Program recommends calculating GFR from SCr. Creatinine measurements are useful in the monitoring of disease progression, with the diagnosis of renal failure when SCr levels are greater than the upper normal interval 5.

Creatinine measurements are useful in the diagnosis and monitoring of diabetic nephropathy, the leading cause of kidney disease in patients commencing renal replacement therapy, affecting 40% of diabetics (type 1 and type 2) 6. The RENAAL risk score for end-stage renal disease (ESRD) emphasizes the importance of the identification of elevated SCr, alongside other renal markers, in the prediction of end-stage renal disease (ESRD) development in patients with type 2 diabetes mellitus (T2DM) and nephropathy 7.

Acute kidney injury (AKI) is a common complication in COVID-19 patients 8. The analysis of creatinine in COVID-19 patients on hospital admission and after 2 to 4 days highlighted impaired renal function and is the leading cause of death in these patients 9. The National Institute of Care Excellence (NICE), have set out four guidelines for acute kidney injury in hospitalised suspected or confirmed COVID-19 patients and highlights the importance of creatinine testing 10.

Want to know more?

Contact us or download the superior performance & unique tests brochure to learn more.

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