Is creatinine 1.3 is safe ?

Diagnosis needed: Serum creatinine is affected by protein intake, gender, age, race, muscular build, and renal function. A rising creatinine is always of concern. "normal" on lab tests is generally less than 1.2 mg/dl. Renal function can be estimated with a more complex formula or measured with a 24 h urine collection. See your internist for further evaluation.

It depends: If you're a well-muscled man, this is normal. When i was lifting weights every day, my creatinine ran 1.6-1.7. If you're a petite lady, this is cause for concern. Get it rechecked if this is you.