Creatinine Clearance, Forearm Muscle
This test measures how well your forearm muscles filter waste products from your blood, similar to how your kidneys work. It helps assess kidney function in relation to muscle mass.
["This test helps doctors check if your kidneys are working properly based on your muscle size."]
Key facts at a glance
- LOINC
- 36000-8
- Short code
- CT Forearm-R
- Synonyms
- CT Forearm-R
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have concerns about kidney function, especially if you have conditions like chronic kidney disease, muscle disorders, or if you’re undergoing treatment that affects kidney health. It can also be used to monitor kidney function in people with certain genetic or metabolic conditions.
What to Expect Before the Test
No special preparation is needed for this test. You may have a small needle inserted into your forearm to draw blood, and the waste product (creatinine) is measured in the blood sample. If the test involves a urine sample, you’ll need to provide a urine sample collected over a specific time period (often 24 hours).
How the Test Works
Creatinine clearance is calculated by measuring creatinine levels in your blood and urine. Blood is drawn to determine creatinine concentration, and urine is collected over a set period to measure how much creatinine is filtered out. The test compares these values to estimate how well your forearm muscles are filtering waste.
What the Results Mean
Results help determine how well your kidneys (or forearm muscle function, in this case) are working to remove waste from your blood. Lower than expected values might suggest impaired kidney function or muscle issues, while higher values could indicate overhydration or other conditions.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is particularly useful for patients with conditions that affect muscle mass, such as muscle wasting, genetic disorders, or those receiving treatments that alter muscle or kidney function. It provides a more accurate assessment of kidney function when muscle mass is significantly different from average.
Short name
Forearm Muscle Creatinine Clearance
Frequently asked questions
What does a forearm muscle creatinine clearance test measure?
Do I need to fast before this test?
Can I take my usual medications before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy