Skip to content

Glucose in Serum (24-hour Profile)

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

This test measures your blood sugar levels over a 24-hour period using a sample of your serum, helping doctors assess how your body manages glucose (sugar) throughout the day.

Quick summary

["This test helps diagnose or monitor conditions like diabetes or insulin resistance by tracking blood sugar fluctuations."]

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

Key facts at a glance

LOINC
47773-7
Short code
GH 45M p Ins IV SerPl-aCnc
Synonyms
GH 45M p Ins IV SerPl-aCnc
Category
hormone
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

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like frequent urination, excessive thirst, fatigue, or unexplained weight changes. It’s also used to evaluate how well your body responds to medications for diabetes or other metabolic conditions.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if your doctor specifies it. Bring any medications you’re currently taking, as some may affect results.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm. The blood is processed to separate serum, which is then analyzed to measure glucose levels at different times.

What Do Results Mean?

Results show your glucose levels at various intervals, helping identify patterns like high or low blood sugar. Abnormal patterns may indicate diabetes, hypoglycemia, or other metabolic disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How often should I check my blood sugar if I have diabetes?
If you have diabetes, your doctor may recommend checking your blood sugar at different times (e.g., fasting, before meals, or after meals) based on your treatment plan. This test provides a 24-hour overview, but daily self-monitoring may still be needed for personal adjustments.
Will fasting before this test affect my results?
Yes, fasting (typically 8–12 hours) before this test helps provide accurate fasting glucose levels. If you’re unsure about fasting rules, ask your doctor or lab technician to avoid misleading results.
Can lifestyle changes, like diet or exercise, impact my glucose levels?
Absolutely. Eating balanced meals, staying active, and managing stress can significantly influence blood sugar levels. This test helps track how lifestyle changes affect your glucose profile over time.
  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