eGFR (MDRD) Test

If your doctor ordered an “eGFR (MDRD) test,” you might expect a separate lab draw. In reality, eGFR is not a test you can request on its own — it is a calculated estimate of your kidney function derived from a routine blood creatinine measurement using the Modification of Diet in Renal Disease (MDRD) equation. This article explains what the eGFR number actually means, where the MDRD equation falls short, how to interpret your result, and what to do next — especially if you live in Bangladesh.

What Is the eGFR (MDRD) Test?

The eGFR (estimated Glomerular Filtration Rate) tells your clinician how well your kidneys are filtering waste from your blood. The “MDRD” refers to the equation used to calculate it. Your lab measures your blood creatinine level (a waste product from muscle activity) and plugs it into an equation that also includes your age, sex, and — in some versions — your race (African American vs. non-African American). The result is reported in millilitres per minute per 1.73 square metres of body surface area (mL/min/1.73m²).

The MDRD equation was developed in 1999 from a study of people with chronic kidney disease (CKD). It is widely used, but it was never designed for people with healthy or near-normal kidneys, and it tends to underestimate true GFR in that group.

How Is eGFR Calculated Using the MDRD Equation?

Your lab calculates eGFR using the following inputs:

• Serum creatinine – measured from your blood sample.
• Age – kidney function normally declines with age.
• Sex – women generally have lower creatinine due to lower muscle mass.
• Race – historically, a correction factor of 1.212 was applied for African American individuals, which has raised concerns about accuracy and equity. Many labs now omit this factor or have switched to race-free equations.

The formula itself is complex (you do not need to memorise it), but understanding the inputs helps you see why the result is an estimate, not a perfect measurement.

What Do eGFR (MDRD) Numbers Mean?

eGFR values are used to stage chronic kidney disease. However, a single reading should never be interpreted in isolation. Age, muscle mass, diet, and acute illness all affect the number. The table below shows the standard CKD staging — but remember, your doctor will also check for protein in urine, blood pressure, ultrasound findings, and the stability of your eGFR over time.

CKD Staging by eGFR (MDRD)

CKD Stage	eGFR (mL/min/1.73m²)	What It May Mean
Stage 1	≥ 90	Normal kidney function, but other signs of kidney disease (e.g., protein in urine) may be present.
Stage 2	60 – 89	Mildly reduced kidney function — common in older adults; often not disease if stable.
Stage 3a	45 – 59	Moderate reduction; requires monitoring and management of risk factors.
Stage 3b	30 – 44	Moderate to severe reduction; closer follow-up needed.
Stage 4	15 – 29	Severe reduction; prepare for possible dialysis or transplant.
Stage 5	< 15	Kidney failure; dialysis or transplant typically needed.

Important: eGFR naturally declines about 0.5–1 unit per year after age 40. A value of 75 in a 75-year-old may be normal for their age. Do not panic over a single borderline number.

Limitations of the MDRD Equation

The MDRD equation has several known shortcomings that are especially relevant in Bangladesh:

• Less accurate at higher GFR: For values above 60 mL/min/1.73m², MDRD tends to underestimate true kidney function, meaning a healthy person might be labelled as having mild kidney disease.
• Muscle mass matters: Creatinine comes from muscle. A person with low muscle mass (e.g., elderly, malnourished, amputees) can have falsely low eGFR. Conversely, bodybuilders or very muscular individuals may have falsely high creatinine and thus falsely low eGFR.
• Dietary influence: High meat intake can raise creatinine temporarily. Vegetarians often have lower creatinine.
• Ethnicity and race factor: The original MDRD equation included a race adjustment that may not apply to South Asian populations. This can misclassify Bangladeshi patients, which is why many labs now prefer the CKD-EPI equation.
• Acute kidney injury: eGFR assumes a steady state. If you are dehydrated, have a severe infection, or are on certain medications (like NSAIDs or some antibiotics), eGFR can drop temporarily and recover once the acute cause resolves.

MDRD vs. CKD-EPI: Which Equation Is Better?

The Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation was developed later to address some of MDRD’s weaknesses. It is now recommended by many international guidelines, including the National Kidney Foundation. The table below compares the two.

MDRD vs. CKD-EPI Equations

Feature	MDRD	CKD-EPI
Developed	1999	2009
Best for	People with known CKD (GFR < 60)	All GFR ranges, especially > 60
Accuracy at GFR > 60	Less accurate; tends to underestimate	More accurate; less misclassification
Race factor	Includes race coefficient	Race-free version available (2021)
Biases	Higher bias in elderly, low muscle mass	Lower overall bias

For Bangladeshi patients, many labs still report MDRD because it is familiar. However, if your eGFR is borderline (e.g., 55–70), ask your doctor whether a CKD-EPI calculation would give a more reliable picture.

What Should You Do If Your eGFR Is Low?

If your eGFR comes back lower than expected, do not jump to conclusions. Here are the recommended steps:

• Repeat the test: A single low value is not diagnostic. Your doctor will likely repeat the creatinine test after a few weeks to see if the drop is persistent.
• Check for temporary causes: Were you dehydrated, taking painkillers (NSAIDs), or fighting an infection? These can reversibly lower eGFR.
• Urine test: A simple urine dipstick or albumin-to-creatinine ratio can detect protein leakage, which is a sign of kidney damage even if eGFR is normal.
• Review medications: Some drugs (especially for diabetes, hypertension, or pain) can affect kidney function. Never stop or change a prescribed medication without consulting your doctor.
• Consult a specialist: If your eGFR remains below 60 for more than three months, or if there is a rapid decline, your doctor will refer you to a nephrologist.

In Bangladesh, you can find qualified kidney specialists by division. The next section lists urologist doctors who also manage kidney conditions; for dedicated nephrology follow-up, ask your primary physician.

How Much Does an eGFR (MDRD) Test Cost in Bangladesh?

Since eGFR is calculated from a blood creatinine test, you do not pay extra for the calculation itself. The cost is part of a kidney function panel, which usually includes creatinine, BUN, and sometimes electrolytes. Prices vary by lab, city, and whether you choose a basic or comprehensive package. The table below shows typical private-sector ranges.

eGFR (MDRD) Test Cost in Bangladesh

Item	Approx. BDT Range	Notes
Serum creatinine (alone)	৳150 – ৳400	eGFR is calculated automatically from this test.
Kidney function panel (creatinine, BUN, electrolytes)	৳300 – ৳1,200	Includes eGFR report; common in health checkups.
Comprehensive renal panel (adds uric acid, calcium, phosphate)	৳600 – ৳2,000	Often required for suspected CKD.

Important: Prices are approximate and change frequently. Always confirm the current cost with your chosen diagnostic centre before the test.

Find urologist doctors by division in Bangladesh

If your eGFR results or kidney symptoms require specialist evaluation, you can search for experienced urologists across Bangladesh. Urologists treat both surgical and medical kidney conditions and can help coordinate your care with a nephrologist if needed.

Division	Find a doctor
Dhaka / ঢাকা	Popular Urologist Doctors in Dhaka
Chattogram / চট্টগ্রাম	Chattogram Urologist Doctors
Khulna / খুলনা	Urologist Doctors Available in Khulna
Rajshahi / রাজশাহী	Rajshahi Urologist Doctors
Rangpur / রংপুর	Urologists in Rangpur
Sylhet / সিলেট	Recommended Urologist Doctors in Sylhet
Barishal / বরিশাল	Top Urologist Doctors in Barishal
Mymensingh / ময়মনসিংহ	Popular Urologist Doctors in Mymensingh

Frequently Asked Questions

Can I directly request an eGFR (MDRD) test from a lab in Bangladesh?

No, eGFR (MDRD) is not a standalone test you can order. It is automatically calculated from your blood creatinine level using the MDRD equation. When you request a ‘kidney function test’ or ‘serum creatinine’ at a Bangladeshi lab (e.g., Popular, Medinova, or Gonoshasthaya Kendra), the report will often include the calculated eGFR value, usually labeled as eGFR (MDRD). You must have a creatinine measurement first to get the eGFR estimate.

Why does my eGFR result change from month to month even if my diet is the same?

Mild fluctuations in eGFR are common and do not always mean your kidney function is worsening. Factors such as hydration level, recent physical activity, muscle injury, and the accuracy of the creatinine measurement can influence creatinine levels and thus the eGFR calculation. In Bangladesh, variations are often seen due to seasonal dehydration in summer or changes in protein-rich meals. A single low eGFR is not diagnostic — doctors typically look for a consistent decline over 3 months. Consistent changes should be discussed with a nephrologist.

Is the MDRD equation accurate for people with normal kidney function or for fit individuals?

The MDRD equation was developed primarily for patients with chronic kidney disease (CKD) and is less accurate for normal or near-normal function. In healthy, muscular individuals or physically active people, MDRD tends to underestimate true kidney function (i.e., gives a lower eGFR than actual). This can wrongly suggest early kidney impairment. Because of this limitation, many labs and doctors in Bangladesh now prefer the CKD-EPI equation, as it is more accurate at higher eGFR values (above 60 mL/min/1.73 m²). Ask your doctor which formula your report uses.

If my eGFR is 40 mL/min/1.73 m², does it mean I need dialysis immediately?

Not necessarily. An eGFR of 40 indicates stage 3 chronic kidney disease (moderate reduction). Dialysis is usually considered when eGFR falls below 15 (stage 5) and symptoms of kidney failure appear. However, persistent moderate CKD can progress without careful management. In Bangladesh, a nephrologist will assess additional factors (urine protein, blood pressure, ultrasound) and advise medication, diet modifications, and lifestyle changes to slow disease progression. Do not delay consultation, but immediate dialysis is not needed at eGFR 40.

My eGFR (MDRD) is 2. What does that mean and how is it possible?

An eGFR of 2 mL/min/1.73 m² is extremely low and indicates advanced kidney failure (stage 5). Such a value would generally result from severe, ongoing kidney damage or acute kidney injury. It is a very serious finding that typically requires emergency medical evaluation and often immediate dialysis or transplant planning. If you see such a result, you should visit a nephrologist immediately this number is not a calculation error but a sign of critical impairment. In rare cases, lab errors or muscle crush injuries could cause falsely low values. Repeated confirms the need for urgent care.

Sources

The following sources are from international journals, government health agencies, or recognized medical organizations:

• Glomerular Filtration Rate (GFR) Test – Mayo Clinic (mayoclinic.org)
• A more accurate method to estimate glomerular filtration rate from serum creatinine: a new prediction equation. Modification of Diet in Renal Disease Study Group (pubmed.ncbi.nlm.nih.gov)
• World Health Organization — eGFR (MDRD) Test (who.int)
• MedlinePlus — eGFR (MDRD) Test (medlineplus.gov)
• CDC — eGFR (MDRD) Test (cdc.gov)
• NHS — eGFR (MDRD) Test (nhs.uk)