Skip to content

Ketone bodies (beta-hydroxybutyrate, acetoacetate) in serum/plasma

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

This test measures the presence of ketone bodies—chemicals your body produces when it uses fat for energy instead of glucose. High levels may indicate conditions like diabetic ketoacidosis or fasting.

Quick summary

["Ketone levels can signal metabolic shifts or medical concerns requiring prompt attention."]

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

Key facts at a glance

LOINC
41096-9
Short code
KEL allele Geno Amn
Synonyms
KEL allele Geno Amn
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why Ketones Matter in Your Body

Ketone bodies are byproducts of fat metabolism. Normally, your body uses glucose for energy, but when glucose is scarce (e.g., during fasting, diabetes, or strict diets), your liver converts fat into ketones. While ketones provide fuel, excessive levels can be dangerous.

When to Expect This Test

Your doctor may order this test if you have symptoms like nausea, vomiting, rapid breathing, or unexplained weight loss. It’s also common in monitoring conditions like uncontrolled diabetes, severe dehydration, or eating disorders.

How the Test Works

A small blood sample is taken from your arm. The lab analyzes serum or plasma for ketone levels using an immunoassay or similar method to detect their presence and concentration.

What Results Mean

Low or normal levels are typical when your body relies on glucose. Elevated levels may indicate fat metabolism as a primary energy source, which can be a warning sign for metabolic imbalances.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Ketone Levels and Health

Short name

Ketone Levels (Serum/Plasma)

Frequently asked questions

What causes elevated ketone levels?
Elevated ketones can result from prolonged fasting, severe diabetes (like diabetic ketoacidosis), excessive alcohol consumption, or certain metabolic disorders. They may also appear in people following very low-carb diets.
What should I do if my ketone levels are high?
If your doctor finds high ketones, they may recommend adjusting your diet, increasing fluids, or treating an underlying condition like diabetes. Follow their guidance immediately to prevent complications.
Can ketones be harmful if too high?
Yes, dangerously high ketone levels can lead to ketoacidosis—a serious condition that requires urgent medical care. Symptoms include confusion, fruity-smelling breath, or extreme weakness. Seek help right away if you notice these signs.
  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