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🧪 What is Serum Creatinine?

Serum Creatinine measures the level of creatinine in the blood, a waste product produced by muscle metabolism. It is primarily filtered out by the kidneys and is a key indicator of kidney function.

❓ Why is the Test Done?

To:

Assess kidney function and detect renal impairment
Monitor progression of chronic kidney disease (CKD)
Evaluate acute kidney injury (AKI)
Calculate estimated glomerular filtration rate (eGFR)
Guide dosing of medications cleared by the kidneys

📊 Normal Range

Serum Creatinine Level	Reference Range
Adult males	0.7 – 1.3 mg/dL
Adult females	0.6 – 1.1 mg/dL
Children	0.3 – 0.7 mg/dL

Ranges may vary slightly based on lab and assay.

📈 Interpretation of Results

Creatinine Level	Clinical Significance
Elevated	Impaired kidney function, acute or chronic kidney injury
Normal	Normal kidney filtration
Low	Decreased muscle mass, pregnancy, or severe malnutrition

🧠 Associated Conditions

Condition	Details
Chronic kidney disease	Progressive loss of kidney function
Acute kidney injury	Sudden kidney damage or dysfunction
Muscle diseases	Low creatinine with muscle wasting
Dehydration	May cause elevated creatinine due to reduced blood flow

🔄 Related / Follow-Up Tests

Blood Urea Nitrogen (BUN)
Estimated Glomerular Filtration Rate (eGFR)
Urinalysis
Electrolytes (Na, K, Cl)
Renal ultrasound

✅ Fasting Required?

Test	Fasting Required
Serum Creatinine	❌ No

📝 Summary Table

Parameter	Details
What	Measures creatinine level in blood as marker of kidney function
Why	Detect and monitor kidney health
Normal Range	Men: 0.7–1.3 mg/dL; Women: 0.6–1.1 mg/dL
Elevated Levels	Kidney dysfunction, AKI, CKD
Low Levels	Reduced muscle mass, pregnancy
Associated Conditions	Kidney disease, muscle disorders, dehydration
Follow-up Tests	BUN, eGFR, urinalysis, electrolytes, imaging
Fasting Required	❌ No

Serum Creatinine

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