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Coccygeal Creatinine (Plasma)

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

This test measures the creatinine level in a small amount of plasma drawn from your blood. Creatinine is a waste product from muscle metabolism that helps assess kidney function.

Quick summary

["This test helps evaluate kidney health by measuring creatinine levels in your blood plasma."]

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

Key facts at a glance

LOINC
36647-6
Short code
XR Coccyx 2V
Synonyms
XR Coccyx 2V
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr
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 healthcare provider may order this test if you have symptoms like fatigue, swelling, or changes in urine output, or if you have a history of kidney issues. It may also be part of routine check-ups or monitoring for chronic conditions.

What to Expect Before the Test

No special preparation is needed, but avoid strenuous activity 24 hours before the test. Fasted or non-fasted states may not significantly affect creatinine levels, but hydration can influence results.

What Happens During the Test

A healthcare professional will draw a small blood sample from a vein in your arm. The blood is processed to separate plasma, and creatinine levels are measured using a specialized lab technique.

What the Results Mean

Higher than expected levels may indicate impaired kidney function, while lower levels could suggest overhydration or muscle loss. Results are interpreted in relation to your overall health and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Creatinine levels are a key marker for kidney function. Elevated levels often signal reduced kidney ability to filter waste, which can lead to complications like fluid buildup, electrolyte imbalances, or increased risk of cardiovascular issues. Regular monitoring helps manage chronic kidney disease or other conditions affecting kidney function.

Short name

Coccygeal Creatinine

Frequently asked questions

What causes creatinine levels to be abnormally high?
Creatinine levels can rise due to kidney disease, dehydration, severe muscle breakdown, or certain medications. Conditions like heart failure or severe infections may also contribute.
What if my creatinine level is high?
If your level is elevated, your doctor may recommend further tests or adjustments to your treatment plan, such as increased fluid intake, medication changes, or monitoring kidney function more closely.
Does diet affect creatinine levels?
Dietary protein intake can influence creatinine levels, but the effect is generally small unless you have significant muscle mass changes or kidney issues. Avoiding excessive protein may help if your kidneys are stressed.
  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