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Creatinine Clearance (from Upper Arm Blood Draw)

Published: August 9, 2026Updated: August 16, 2026

This test measures how well your kidneys filter waste products from your blood, using a sample taken from your upper arm. It helps assess kidney function by evaluating how quickly creatinine—a waste product—is removed from your bloodstream.

Quick summary

["This test helps doctors check kidney health and guide treatment plans for conditions like chronic kidney disease."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
36023-0
Short code
CT Upper arm
Synonyms
CT Upper arm
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 Is Done

Your doctor may order this test if they suspect kidney problems, monitor kidney function over time, or evaluate how well medications are being processed by your kidneys. It’s often used alongside blood tests to get a full picture of kidney performance.

How the Test Works

To calculate creatinine clearance, two blood samples are typically taken: one at the start of a timed urine collection period and another at the end. The urine is collected over a set time (often 24 hours). The test measures creatinine levels in both blood and urine to estimate how efficiently your kidneys filter waste.

Sample Collection Process

A healthcare provider will draw blood from your upper arm using a small needle. You may feel a brief pinch, but the process is quick. The urine sample is collected in a container over the specified time period, usually at home or under supervision.

What to Expect Before the Test

No special preparation is usually needed, but you should avoid strenuous activity or eating a high-protein meal before the blood draw. Drink plenty of water on the day of the test to help your kidneys function normally.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Upper Arm Creatinine Clearance

Frequently asked questions

What does a low creatinine clearance mean?
A low creatinine clearance suggests your kidneys may not be filtering waste as efficiently as they should. This could indicate early kidney disease, dehydration, or other health issues affecting kidney function.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your doctor will discuss the findings with you during your follow-up visit.
Can I drink alcohol before this test?
Alcohol in moderation is usually fine, but avoid heavy drinking before the test as it may affect kidney function temporarily. Stick to your usual routine unless advised otherwise by your doctor.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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