Enter Your Serum Creatinine Result

Enter your serum creatinine value and select the unit from your laboratory report. You may also enter your age, sex and any known eGFR from the same report.

Serum creatinine value

Age — optional

Sex — optional

Known eGFR from the same report — optional, if your report includes it

Entered Values

Serum Creatinine Interpretation

For a better kidney function interpretation, use:

🫘 Kidney Function Report Reader — combines eGFR, creatinine & urine ACR 🔬 eGFR Calculator — calculate eGFR from creatinine, age and sex

This tool provides educational interpretation only. Always consult your doctor for personalised medical guidance.

Understanding Your Serum Creatinine Result

Serum creatinine is a commonly ordered blood test, but it should not be interpreted alone. eGFR — calculated from creatinine, age and sex — gives a much more accurate picture of kidney filtration function.

What Is Creatinine?

Creatinine is a waste product produced constantly by the muscles during normal energy metabolism. It is filtered out of the blood by the kidneys and excreted in urine. When kidney function is reduced, creatinine builds up in the blood, causing the serum creatinine level to rise.

Why Creatinine Alone Is Not Enough

The "normal range" for serum creatinine varies widely between individuals. A serum creatinine that appears normal for one person may reflect significantly reduced kidney function in another — particularly in older adults, women, or people with low muscle mass. A creatinine of 1.0 mg/dL may reflect very different kidney function in a 25-year-old male athlete and an 80-year-old woman.

🔬 Why eGFR Is More Useful Than Creatinine Alone

eGFR (estimated Glomerular Filtration Rate) is calculated from serum creatinine along with age and sex. It gives a standardised measure of kidney filtration in mL/min/1.73 m², making it far more reliable for detecting and monitoring kidney disease than creatinine alone. A normal eGFR is generally 60 or above. If your report includes eGFR, use the Kidney Function Report Reader or eGFR Calculator for the best interpretation.

What Factors Affect Creatinine?

Serum creatinine is affected by:

Muscle mass: People with more muscle produce more creatinine. A bodybuilder may have a "high" creatinine but perfectly normal kidney function.
Age: Older adults typically have less muscle and therefore lower creatinine — but they may also have reduced kidney filtration.
Sex: Males generally have higher creatinine than females due to greater muscle mass.
Diet: A high-meat diet can temporarily raise creatinine.
Hydration: Dehydration can raise creatinine. Drinking large amounts of water may lower it temporarily.
Acute illness: Any acute illness can cause a temporary rise in creatinine.

Creatinine Units — mg/dL vs µmol/L

Creatinine is reported in different units by different laboratories. Sri Lankan laboratories most commonly use mg/dL. Many international labs use µmol/L. The conversion is: µmol/L ÷ 88.4 = mg/dL. For example, 97 µmol/L ≈ 1.1 mg/dL.

Related Tools & Internal Links

Frequently Asked Questions

Common questions about serum creatinine results and kidney function testing.

Is serum creatinine the best test for kidney function?▼

Serum creatinine alone is not ideal for assessing kidney function because it varies significantly with age, sex, and muscle mass. eGFR, which is calculated from serum creatinine while adjusting for age and sex, is a more standardised and clinically useful measure of kidney filtration. Most kidney function reports now include eGFR alongside creatinine.

What is a normal creatinine level?▼

There is no single universal "normal" creatinine value because it depends on age, sex, and muscle mass. As a rough guide, most laboratory reference ranges for adults are approximately 0.7–1.2 mg/dL for males and 0.5–1.0 mg/dL for females — but these ranges should not be used to interpret your result without also considering your eGFR, age, and clinical context. Consult your doctor for a proper interpretation.

My creatinine is slightly above the lab reference range — should I be worried?▼

Not necessarily. A slightly elevated creatinine does not always mean a kidney problem — it may reflect high muscle mass, dehydration, a recent high-protein meal, or an acute illness. eGFR is more informative than a borderline creatinine result. If your eGFR is above 60 and you have no symptoms or risk factors, your doctor may simply recommend a repeat test. Always interpret creatinine results in their full clinical context.

What is the difference between serum creatinine and eGFR?▼

Serum creatinine is a direct measurement of creatinine in the blood. eGFR (estimated Glomerular Filtration Rate) is a number calculated from creatinine, age and sex, which estimates how well the kidneys are filtering blood — expressed in mL/min/1.73 m². eGFR is more clinically useful because it accounts for the variability in creatinine due to age, sex, and muscle mass. A normal eGFR is 60 or above.

Serum Creatinine Report Reader