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Glucose in Plasma (24-hour profile)

Published: August 9, 2026Updated: August 17, 2026

This test measures your blood sugar levels over a 24-hour period to help assess how your body manages glucose, especially useful for diagnosing or monitoring conditions like diabetes.

Quick summary

["Understanding your glucose levels throughout the day helps doctors check how well your body handles blood sugar."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
11048-6
Short code
GAPD RBC-cCnc
Synonyms
GAPD RBC-cCnc
Category
glucose
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
4.2
Ref high
5.9
Critical range
2 N/A – 7 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85041
SNOMED
900000000000003001
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test if you have symptoms of diabetes (like frequent urination, extreme thirst, or fatigue), if your blood sugar levels are consistently high or low, or if you’re at risk due to factors like obesity, family history, or certain medications. It can also help evaluate how well treatments like insulin or diet are working.

How the Test Works

A small blood sample is drawn at multiple times over 24 hours to measure glucose concentration in your plasma. The results are used to create a profile that shows your blood sugar trends.

What to Expect Before the Test

No special preparation is needed, but you may be asked to keep a daily food and activity log. Avoid skipping meals or exercising heavily before your scheduled draws.

What to Expect During the Test

You’ll have several blood draws at set times (often including morning, afternoon, and evening). The process is quick and typically done in a clinic or doctor’s office. You may feel slight discomfort at the needle site.

Reference range

Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A

Specimen: whole-blood

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Plasma Glucose Monitoring

Frequently asked questions

What does a normal result mean?
A normal result doesn’t mean your blood sugar is perfectly stable—it shows your body’s typical response to food, activity, and other factors over time. Doctors use these patterns to assess overall health and tailor care.
How often should I get this test?
The frequency depends on your health status. People with diabetes usually get this test more often (e.g., every 3–6 months) to monitor progress, while others may need it less frequently or only if symptoms arise.
Can I eat or drink before the blood draws?
Yes, but avoid skipping meals or consuming large amounts of sugar right before your scheduled draws. Follow your doctor’s instructions for timing to get accurate 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 17, 2026. · Read our editorial policy