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Serum Insulin with 3-Hydroxybutyrate (3-HPGL) Ratio

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

This test measures the ratio of insulin to 3-hydroxybutyrate (a ketone body) in your blood, often used to assess insulin sensitivity and metabolic health.

Quick summary

["Helps evaluate how well your body responds to insulin and balances energy sources during fasting or metabolic stress."]

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

Key facts at a glance

LOINC
47662-2
Short code
Insulin 3h p Glc SerPl-aCnc
Synonyms
Insulin 3h p Glc SerPl-aCnc
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
2.6
Ref high
24.9
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
CPT
83525
SNOMED
413618004
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 Might Be Ordered

Your healthcare provider may recommend this test if you have suspected insulin resistance, metabolic syndrome, or conditions like diabetes, gestational diabetes, or unexplained weight changes. It may also be used in research or specialized clinical settings to study energy metabolism.

What to Expect Before the Test

You’ll typically fast for 8–12 hours before this test, as insulin levels fluctuate with food. Avoid caffeine or alcohol for several hours beforehand. Bring any medications you’re currently taking to your appointment.

How the Test Works

A blood sample is drawn from a vein in your arm. The sample is processed to measure both insulin and 3-hydroxybutyrate levels, then their ratio is calculated. This ratio helps assess how efficiently your body uses insulin and produces ketones.

What the Results Mean

A higher-than-expected insulin-to-3-hydroxybutyrate ratio may suggest insulin resistance or impaired glucose metabolism, while a lower ratio might indicate overproduction of insulin or altered ketone use. Your results will be interpreted by your healthcare provider in the context of your overall health.

Reference range

Fasting: 2.6-24.9 μIU/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Insulin:3-HPGL Ratio

Frequently asked questions

Why might my doctor be concerned about my insulin:3-HPGL ratio?
A doctor might investigate an abnormal ratio if you have symptoms like fatigue, unexplained weight changes, or metabolic issues (e.g., high blood sugar, low energy). This test can also help monitor conditions like prediabetes, polycystic ovary syndrome (PCOS), or metabolic syndrome, where insulin resistance plays a key role.
What does a ‘normal’ ratio mean for my health?
A ‘normal’ ratio doesn’t guarantee perfect health—it’s a snapshot of your metabolic balance. Your doctor will use it alongside other tests (like blood sugar or glucose tolerance) to guide treatment, such as lifestyle changes or medication adjustments.
Can I adjust my diet or lifestyle before this test?
Yes! Follow fasting instructions precisely, avoid sugary foods/drinks, and limit alcohol. If you’re on medications (e.g., diabetes drugs), ask your provider if you should pause them temporarily. Always confirm with your lab or doctor before making changes.
  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