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Renal function assays

Precision testing for renal health

Overview

Renal Function impairment

Several assays are available for use on the Optilite® Analyser to measure kidney function and proteinuria, using serum and urine samples.

Kidney function can be assessed by using markers such as creatinine to calculate the estimated Glomerular Filtration Rate (eGFR).

Proteinuria is the presence of excess proteins in urine and can be assessed by performing several urine tests. Undetected proteinuria may mean underlying kidney damage is not identified. This may lead to irreversible kidney damage, leading to kidney failure.

Renal impairment in Multiple Myeloma (MM):

  • Renal impairment (eGFR of <60 ml/min/1.73 m2) is a common and potentially serious finding in multiple myeloma (MM)
  • Newly diagnosed MM patients with renal impairment have inferior survival rates
  • Early diagnosis and prompt treatment of renal impairment due to cast nephropathy caused by multiple myeloma is critical since the window of opportunity for reversing it is very limited
  • Patients with severe acute kidney injury (AKI) of unknown cause should be screened for monoclonal gammopathy in case this is the underlying cause of the kidney injury
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Renal Function assessment

Why choose cystatin measurement OVER creatinine when calculating eGFR?

Assessment of renal function is vital in Multiple Myeloma (MM) patients. This is often done by eGFR.  This calculation can use creatinine or Cystatin C values in the estimate. 

Compared to creatinine, Cystatin C test is a more sensitive marker for renal filtration and is unaffected by age, and gender1,2. The use of Cystatin C to calculate eGFR instead of creatinine may help avoid underestimating kidney disease in MM patients, particularly among women.

A recent study in newly diagnosed patients with MM (24 women / 37 men, mean age of 68 ±11) investigated different equations used for the evaluation of eGFR, and compared them with the reference method to identify the most sensitive equation for detection of kidney disease, and to identify patients with more risk factors. 

Therefore, the use of creatinine in the calculation may underestimate the extent of kidney disease in patients with MM, which can affect treatment doses and toxicity.3

The study concluded that inclusion of Cystatin C values in equations such as CKD-EPI and CAPA are more accurate when detecting hidden kidney disease, as well as patients with more and worse prognostic factors.

There is evidence that Cystatin C is superior to creatinine when calculating eGFR for patients with MM

Cystatin C – Recommended for the assessment of patients with Multiple Myeloma

National Kidney Foundation – American Society of Nephrology (NKF-ASN) recommendations: 

A joint task force of NKF- ASN recommended immediate implementation of CKD-EPI creatinine equation; issued a report aiming at suppressing race adjustments in eGFR calculations, and stressing that Cystatin C-based calculations do not include such bias.4

 

  • Beta-2-microglobulin is a low molecular weight protein found on the surface of most nucleated cells.
  • It is excreted only in trace amounts in the urine. However, in tubulo-interstitial disorders, excretion of this protein increases markedly. Thus, urinary Beta-2-microglobulin measurement is a valuable tool for the investigation of tubulo-interstitial renal damage.
  • Optilite Beta-2-microglobulin urine kit is used for quantitative determination of Beta-2-microglobulin  in urine samples. This aids in the diagnosis of active rheumatoid arthritis and kidney disease.
  • Beta-2-microglobulin levels in serum are typically raised in renal disease and rheumatoid arthritis.
  • Elevated serum levels are also observed in Inflammatory conditions and haematological malignancies.
  • Optilite Beta-2-microglobulin kit is used for quantitative determination of Beta-2-microglobulin in serum samples. This aids in the diagnosis of active rheumatoid arthritis and kidney disease. 

Renal Function assay menu

Assays Product Code Kit Size
Optilite Low Level Total Protein Reagent* NK061.L.OPT 100 tests
Cystatin C LK048.OPT.A 100 tests
Albumin NK032.OPT.A 100 test
Low Level Albumin NK032.L.OPT.A 100 tests
Beta-2-Microglobulin LK043.OPT.A 100 tests
Beta-2-Microglobulin Urine LK043.L.OPT.A 100 tests

 

Description Product Code Kit Size
Optilite Low Level Total Protein Calibrator NC061.L.OPT 1 x 2.5mL Vial
Optilite Low Level Total Protein Controls NQ061.L.OPT 2 x 5mL Vials (high & low)
 
*Calibrators and Controls sold separately.
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Contents
Renal Function assay menu
Renal Function impairment
Renal Function assessment
Cystatin C
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References
1. Laterza OF, Price CP, Scott MG. Cystatin C: an improved estimator of glomerular filtration rate? Clin Chem 2002;48:699-707.
2. Inker LA, Eneanya ND, Coresh J, Tighiouart H, Wang D, Sang Y, et al. New Creatinine- and Cystatin C-Based Equations to Estimate GFR without Race. N Engl J Med 2021;385:1737-49.
3. Cepeda-Piorno et al. Cystatin C-Based Equations Detect Hidden Kidney Disease and Poor Prognosis in Newly Diagnosed Patients with Multiple Myeloma. Adv Hematol 2022
4. Delgado C et al. A Unifying Approach for GFR Estimation: Recommendations of the NKF-ASN Task Force on Reassessing the Inclusion of Race in Diagnosing Kidney Disease. Am J Kidney Dis. 2022;79(2):268-288.e1.