3 min readApta
What's a normal creatinine and eGFR range for an elderly parent?
Creatinine and eGFR are the two numbers on almost every Indian lab report that show how well the kidneys are filtering. Here's what counts as normal, and — more importantly — what counts as a trend.
For most adults, serum creatinine between roughly 0.6–1.3 mg/dL is considered within range, and an eGFR above 60 mL/min/1.73m² is considered normal kidney function. Both numbers shift slightly with age, sex, and which lab ran the test — but the range matters far less than whether the number is moving. A creatinine of 1.4 sitting there year after year is a different story from a creatinine that went from 1.4 to 2.0 over four years, even though only the second one looks alarming on any single report.
What each number actually measures
Creatinine is a waste product from muscle activity that healthy kidneys filter out of the blood. When the kidneys filter less well, creatinine builds up — so a rising creatinine means declining kidney function. It's reported directly in mg/dL (or sometimes µmol/L outside India).
eGFR (estimated glomerular filtration rate) is calculated from that same creatinine value, plus age and sex, and expresses how much blood the kidneys are filtering per minute. eGFR moves in the opposite direction to creatinine: a falling eGFR also means declining function. Because it's adjusted for age and sex, many doctors treat eGFR as the more useful single number to watch — though the two are really telling you the same underlying story from two angles.
The reference ranges, and their real limit
| Typical range | What a rise/fall means | |
|---|---|---|
| Creatinine | ~0.6–1.3 mg/dL (varies by lab, sex, age) | Rising = kidneys filtering less well |
| eGFR | Above 60 mL/min/1.73m² | Falling = kidneys filtering less well |
The catch with any reference range is that it's a population average, not a verdict on one person. A creatinine of 1.4 is "in range" on a report for a 75-year-old man and might already represent a meaningful decline from where he was five years earlier — the single value can't tell you that. Only the sequence can.
Why the trend is the actual signal
This is worth spelling out plainly, because it's the single most common way a kidney problem goes unnoticed in an elderly parent: every individual report can look fine while the underlying trend is not. A value drifting from the low end of the range to the high end over several years stays "normal" on paper the entire time — right up until it crosses the line, by which point the change has usually been building for a while.
This is exactly what happened in the story behind why Apta exists: a creatinine of 1.4 climbed to 2.02 over four years, one lab report at a time, without any single result ever looking urgent enough on its own to raise. The broader guide to reading a parent's lab report covers the other markers worth tracking the same way — HbA1c, TSH, haemoglobin, and the lipid panel all behave the same way: one result tells you little, a series tells you a lot.
What tends to affect creatinine and eGFR in older parents
A few things worth knowing before reading too much into a single change:
- Dehydration can temporarily raise creatinine — a report taken during an illness or after a hot spell isn't automatically a real decline.
- Diabetes and high blood pressure are the two most common long-term drivers of kidney decline in Indian adults, which is why creatinine is worth watching closely alongside those conditions specifically.
- Some medications (including certain diabetes and blood-pressure drugs) affect the kidneys and may need dose adjustments as eGFR changes — this is a question worth raising directly, not assuming the doctor will connect on their own.
What to actually do with a change you've noticed
Write down the actual numbers and dates, not just "it's gone up" — a doctor can act on "1.4 to 2.0 over four years across these four reports" far faster than on a vague impression. That single sentence is the difference between a trend that gets managed and one that gets missed.
Apta plots creatinine and eGFR on a timeline automatically from every report you forward, so a drift like this shows up on its own — no laying four years of paper reports side by side on a table to see it.
This is general information about a lab marker, not a diagnosis. Reference ranges vary by lab and by person, and only a clinician who knows the full picture can say what a specific change means. Always discuss results with a qualified doctor.