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Creatinine Clearance (from Wrist Cuff Blood Pressure Measurement)

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

This test estimates how well your kidneys filter waste from your blood using your wrist blood pressure measurement. It helps assess kidney function indirectly by measuring how quickly creatinine (a waste product) leaves your blood.

Quick summary

["A lower clearance may indicate kidney problems; higher values suggest normal or efficient kidney function."]

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

Key facts at a glance

LOINC
37428-0
Short code
CT Wrist
Synonyms
CT Wrist
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

What This Test Measures

Creatinine clearance is calculated using a simple formula that combines your blood creatinine levels (measured separately) and your wrist blood pressure. This method approximates how well your kidneys filter waste, though it’s not as precise as traditional 24-hour urine tests.

Why It’s Done

Doctors may use this test to monitor kidney function in people with hypertension, diabetes, or suspected kidney disease. It’s a quick alternative to more complex tests when blood pressure is available.

How It Works

Your blood pressure is measured at your wrist, and your blood creatinine level is tested separately. The test provider uses these values to estimate how fast creatinine is cleared from your blood, reflecting kidney efficiency.

What to Expect

You’ll have a small blood draw from your wrist (like a regular blood test) and may need to measure your blood pressure. Results are typically ready within a few days.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Wrist BP Clearance Estimate

Frequently asked questions

Why is this test called ‘wrist’ instead of ‘arm’ blood pressure?
The test uses wrist blood pressure because it’s easier to measure in some settings (like outpatient clinics) and provides a similar estimate to traditional arm measurements. Blood pressure at the wrist can vary slightly from arm measurements, so results should be interpreted with your provider’s guidance.
Does this test replace a traditional 24-hour urine creatinine clearance test?
No, this is an estimate. Traditional 24-hour urine tests are more accurate for measuring kidney function but require collecting urine over 24 hours. Your provider may use this test as a quick screening tool or supplement to other tests.
Can I eat or drink before this test?
Typically, no special preparation is needed. However, always follow your provider’s instructions, as some tests may require fasting or avoiding certain foods/drinks for accuracy.
  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