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Weston Alpha Hydroxybutyrate (plasma/serum) concentration

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

This test measures the level of hydroxybutyrate, a ketone body produced during fat metabolism, often assessed in conditions requiring ketosis monitoring.

Quick summary

["Ketone monitoring helps track metabolic shifts, especially in fasting or metabolic disorders."]

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

Key facts at a glance

LOINC
6275-2
Short code
West Ragweed IgE Qn
Synonyms
West Ragweed IgE Qn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Is This Test For?

This test is primarily used to evaluate ketosis, which can occur naturally during fasting, carbohydrate restriction, or in certain metabolic conditions. It may also be part of broader metabolic screening, especially in patients with suspected diabetic ketoacidosis or other metabolic disorders.

When Might You Need This Test?

Your healthcare provider may order this test if you’re undergoing a fasting or low-carbohydrate diet, have symptoms like nausea, fatigue, or unusual breath odor, or if you’re being monitored for conditions like diabetes, liver disease, or ketogenic therapy.

How Is the Sample Collected?

A blood sample is drawn from a vein, usually in your arm. The blood is processed to separate plasma or serum for testing.

What Are Possible Results?

Results are interpreted relative to your clinical context, such as diet, symptoms, or known conditions. Elevated levels may indicate ketosis, while very low levels could suggest metabolic challenges.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Weston AHB

Frequently asked questions

Why do some people need this test while fasting?
During fasting, your body burns fat for energy, producing ketones as a backup fuel source. This test helps assess whether your body is efficiently producing ketones or if there’s an imbalance that needs medical attention.
What if my results are outside the usual range?
Your doctor will discuss the results with you based on your health history, symptoms, and other tests. Elevated ketones may need monitoring to prevent complications, while very low levels might require dietary or medical adjustments.
Can I eat or drink before this test?
If fasting is part of the reason for this test (e.g., for ketosis monitoring), follow your provider’s instructions—typically no food or liquids for 8–12 hours before drawing blood. If fasting isn’t required, eat normally but avoid heavy meals that might skew results.
  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