Serum Creatinine Test

Why does the normal range differ between men and women?

Creatinine is a byproduct of muscle metabolism, and since men generally have more muscle mass than women, their normal creatinine range tends to run slightly higher.

Can exercise affect my creatinine result?

Yes, intense exercise shortly before the test can temporarily raise creatinine levels by increasing muscle breakdown, so it's best to avoid vigorous activity the day before testing.

What's the relationship between creatinine and eGFR?

eGFR is calculated directly from your creatinine level along with your age and sex, converting the raw number into a percentage estimate of how well your kidneys are actually filtering blood.