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Albumin to Creatinine Ratio (Serum)

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

This test measures the ratio of albumin (a protein) to creatinine (a waste product from muscle breakdown) in your blood to help assess kidney function and protein loss.

Quick summary

["Helps detect kidney issues or protein loss in urine by comparing protein and waste levels in blood."]

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

Key facts at a glance

LOINC
93418-2
Short code
(8;8)(HEY1,NCOA2) Tiss Ql
Synonyms
(8;8)(HEY1,NCOA2) Tiss Ql
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
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 to check for early signs of kidney disease, such as proteinuria (protein in urine) or chronic kidney conditions. It can also help monitor conditions like diabetes or high blood pressure that may affect kidney health.

How the Test Works

A small blood sample is taken from your arm. The albumin and creatinine levels are measured separately and then compared as a ratio. This ratio helps identify if your kidneys are retaining protein normally or if there’s a loss of protein through urine.

What to Expect Before the Test

No special preparation is needed, but you may be asked to avoid certain medications or supplements that could affect test results. Drink plenty of water the day of the test to help your kidneys function normally.

What the Results Mean

A higher-than-expected albumin-to-creatinine ratio may indicate kidney problems, such as damage or protein loss. A lower ratio might suggest dehydration or other conditions affecting protein levels. Your results will be interpreted by a healthcare provider based on your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Albumin:Creatinine Ratio

Frequently asked questions

How often will I need this test?
This test is often used as a screening tool, especially in people with risk factors for kidney disease (e.g., diabetes, high blood pressure, or a family history of kidney problems). Your provider may recommend follow-up tests or adjustments to your treatment plan based on the results.
What are the typical reference ranges?
Reference ranges vary by lab and individual health. A ratio below 15 mg/g is generally considered normal, but your provider will discuss your specific results with you.
Can I eat or drink anything before this test?
You can eat and drink normally before this test, as no special diet is required. However, avoid excessive alcohol or medications that may affect kidney function unless instructed otherwise.
  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