A Creatinine test measures the level of creatinine, a waste product produced by muscles during normal activity. Your kidneys filter creatinine from your blood and excrete it in urine, making it a reliable marker of kidney function.
What This Test Measures
Creatinine:
A breakdown product of creatine phosphate in muscle tissue. Creatinine is produced at a relatively constant rate and is removed by the kidneys. When kidney function declines, creatinine levels rise.
Reference Ranges
• Men: 0.7-1.3 mg/dL
• Women: 0.6-1.1 mg/dL
Ranges vary based on age, muscle mass, and laboratory. Results are often used to calculate eGFR (estimated glomerular filtration rate).
Who Should Consider This Test
• Routine kidney function screening
• Monitoring chronic kidney disease
• Before starting medications processed by the kidneys
• Those with diabetes or high blood pressure (risk factors for kidney disease)
• Monitoring effects of medications that may affect kidneys
• Athletes or those with high muscle mass (may have naturally higher levels)
• People on testosterone replacement therapy
Factors Affecting Creatinine
• Muscle mass (more muscle = higher creatinine)
• Diet (high meat intake can temporarily raise levels)
• Certain medications
• Dehydration
• Intense exercise
How It Works
1. Order your test online – no doctor visit required
2. Visit any Quest Diagnostics location nationwide
3. Simple blood draw takes approximately 5 minutes
4. Results delivered to your secure portal within 1-2 business days
Preparation
No fasting required. For most accurate results, avoid strenuous exercise and high-protein meals 24 hours before testing.
Related Tests to Consider
• BUN (Blood Urea Nitrogen) – Another kidney function marker
• Comprehensive Metabolic Panel – Includes creatinine and BUN
• Renal Function Panel – Focused kidney assessment
Why Choose Wittmer Rejuvenation Clinic
At $9, our Creatinine test is an affordable way to monitor kidney function. We partner with Quest Diagnostics for reliable, CLIA-certified laboratory testing.
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