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How to Convert Creatinine Units

For creatinine, 1 mg/dL is equivalent to 88.4 µmol/L. To convert mg/dL to µmol/L, multiply by 88.4. To convert µmol/L to mg/dL, divide by 88.4.

When creatinine is reported in mg/L, multiply by 8.84 to obtain µmol/L. Conversely, divide µmol/L by 8.84 to obtain mg/L.

Equivalent Creatinine Reporting Units

• mg/dL, mg/100mL, and mg% represent the same numerical concentration.
• mg/L and µg/mL are numerically equivalent.
• 1 mmol/L equals 1000 µmol/L.
• 10 mg/L equals 1 mg/dL and approximately 88.4 µmol/L.

Clinical Context and Limitations

Creatinine is a waste product associated with normal muscle metabolism and is commonly used as a filtration marker. Serum creatinine is frequently incorporated into equations that estimate glomerular filtration rate, but the concentration alone does not provide a complete assessment of kidney function.

Interpretation should consider the specimen type, laboratory method, local reference interval, and the patient’s clinical context.

• Creatinine concentration may be influenced by muscle mass, age, diet, hydration, pregnancy, medications, and acute illness.
• A creatinine result should not be converted directly into an eGFR without using a validated equation and the required patient variables.
• Kidney assessment commonly combines serum creatinine-based eGFR with urine albumin measurement when clinically appropriate.
• Reference intervals for serum creatinine must not be applied to urine creatinine results.

References and Conversion Standards

1. Clinical Chemistry. Instructions to Authors: serum creatinine in mg/dL is converted from µmol/L by dividing by 88.4.
2. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Chronic Kidney Disease Tests and Diagnosis.
3. NIDDK. Clinical Measurements and eGFR Accuracy: factors affecting serum creatinine and estimated GFR.