Activity 2B. GFR Calculator

Learning Objective Performance Indicators

  • Explain the impact of HCV on renal disease
  • Summarize the main findings from HCV treatment studies in people with renal disease
  • Discuss dosing of direct-acting antiviral medications in persons with chronic renal disease
  • Describe appropriate HCV treatment in persons prior to renal transplantaton
  • Summarize HCV treatment recommendations in persons following renal transplantation

Instructions

A 55-year-old woman is seen to begin therapy for chronic HCV genotype 2 infection. She is African-American and her weight is 61 kg. Her serum creatinine is 1.27 mg/dL.

Using the GFR Calculator tool below (which can also be found by clicking on the Clinical Calculators tab in the top navigation bar), obtain an estimate of this patient's GFR and then answer the Activity Question below.

2021 CKD-EPI Adult eGFR Calculator

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Sex:

Age (years):

Black Race:

Serum Creatinine (mg/dL):

+
GFR:mL/min/1.73 m2


MDRD 4-variable GFR Equation

GFR in mL/min per 1.73 m2 = 175 x SerumCr-1.154 x age-0.203 x 1.212 (if patient is black) x 0.742 (if female)

Notes: The original Modification of Diet in Renal Disease (MDRD) equation was based on 6 variables: age, sex, ethnicity, serum creatinine, urea, and albumin (often referred to as MDRD 6). Subsequently, the MDR was simplified to a 4-variable version (MDRD-4) that included age, sex, ethnicity, and serum creatinine. This 4-variable version was later reexpressed using serum creatinine values that were standardized to reference methods. The equation shown here is the reexpressed 4-variable MDRD equation.

Sources

  • Levey AS, Bosch JP, Lewis JB, Greene T, Rogers N, Roth D. A more accurate method to estimate glomerular filtration rate from serum creatinine: a new prediction equation. Modification of Diet in Renal Disease Study Group. Ann Intern Med. 1999;130:461-70.
  • Levey AS, Coresh J, Greene T, et al. Using standardized serum creatinine values in the modification of diet in renal disease study equation for estimating glomerular filtration rate. Ann Intern Med. 2006;145:247-54.

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Activity Question

You should answer this question after completing the activity.

You must answer all of the questions before checking your work.

What is this woman's estimated GFR?

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