HealthFlex
×
  • Home
  • Immunology Book
  • Lab Tests
    • Hematology
    • Fluid analysis
    • CSF
    • Urine Analysis
    • Chemical pathology
    • Blood banking
    • Fungi
    • Immune system
    • Microbiology
    • Parasitology
    • Pathology
    • Tumor marker
    • Virology
    • Cytology
  • Lectures
    • Bacteriology
    • Liver
    • Lymph node
    • Mycology
    • Virology
  • Blog
    • Economics and technical
    • Fitness health
    • Mental health
    • Nutrition
    • Travel
    • Preventive health
    • Nature and photos
    • General topic
  • Medical Dictionary
  • About Us
  • Contact

Diabetes Mellitus:- Part 3 – Glucose after 2 hours of meal (postprandial glucose level)

October 23, 2023Chemical pathologyLab Tests

Glucose after 2 hours (Postprandial glucose)

What Sample for blood glucose is required?

  1. The test is done on the serum of patients or oxalate blood.
    • When the test is done on the serum, the serum should be separated within 30 minutes of collection.
  2. The serum can be stored at 25° C for 8 hours and 72 hours at 4 °C.
  3. Oxalated blood can also be used. Preservative sodium fluoride may be added.
    • The plasma can be stored at 25 °C for 24 hours (with preservative sodium fluoride).

What Precautions for blood glucose are necessary?

  1. In the case of fluoride as a preservative, a 9 mg/dL decrease is seen during the first 2 hours.
  2. The whole blood glucose level is 90% of the plasma glucose.

Pathophysiology of glucose metabolism

  1. Carbohydrate metabolism and interaction between carbohydrates, fats, and proteins. This interaction is important for our body to control glucose levels.
Diabetes mellitus and insulin action

Diabetes mellitus and insulin action

Carbohydrate metabolism

Diabetes mellitus and insulin action

Glucose level is regulated by insulin and glucagon

Glucose level is regulated by insulin and glucagon

Definition of 2-hour of glucose level (postprandial glucose):

  1. It will give the body glucose tolerance 2 hours after the meal.
  2. Meal acts as a glucose challenge for body metabolism.
  3. Insulin is secreted in response to increased glucose levels due to food intake.
  4. Blood glucose will be normal within 2 hours.
  5. In diabetic patients, glucose levels will remain elevated.
Post prandial glucose (2 hours glucose)

Postprandial glucose (2 hours glucose)

Interpretation of postprandial or 2-hour of glucose:

  1. Postprandial glucose level is a screening test for DM.
  2. If the glucose level is >140 mg/dL and <200 mg/dL, then GTT (glucose tolerance test) is advised.
  3. If the level after 2 hours = >200 mg/dL,  diabetes mellitus is confirmed.
  4. Advise HbA1c for further evaluation.
Glucose postprandial (2 hours)

Glucose postprandial (2 hours)

What is a 2-hour (postprandial) glucose level?

Source 1

  • <120 mg/dL
    • To convert into SI unit x 0.0555 = mmol/L

2-hour glucose (postprandial)level:

  1. Normal = <140 mg/dL.
  2. Impaired glucose tolerance (IGT) = 140 to 199 mg/dL
  3. Diabetes mellitus = ≥200 mg/dL

Another source 2

Time of glucose check Blood glucose level
  • 0 to 50 years
  • <140 mg/dL (<7.8 mmol/L)
  • 50 to 60 years
  • <150 mg/dL
  • 60 years and older
  • <160 mg/dL
  • One-hour glucose screening for gestational diabetes
  • <140 mg/dL

The latest criteria for Diabetes Mellitus:

  1. The level of 200 mg/dl or
    1. Above 200 mg/dl after 75 grams of glucose overload or
  2. Two casual glucose readings of 200 mg/dl or above are labeled as Diabetic patients.
    • This test is not recommended because of the many factors influencing the result.
Diagnosis Fasting glucose level Random glucose level 2-hour glucose level (in OGTT) HbA1c 
Prediabetics 100 to 125 mg/dL 140 to 199 mg/dL 140 to 199 mg/dL 5.7 to 6.4%
Diabetes mellitus > 126 mg/dL >200 mg/dL >200 mg/dL >6.5%
  • Please, for more details on Glucose, see in Glucose fasting level.

Questions and answers:

Question 1: What is a stimulus for the insulin release.
Show answer
Food, when entering the stomach, will lead to the stimulus of the pancreas and secrete insulin.
Question 2: What is the level of HbA1c for the diabetic patients.
Show answer
It is usually >6.5%.

Possible References Used
Go Back to Chemical pathology

Comments

Alan Damer Reply
August 12, 2020

is OGTT 145mg/dl after one hour is considered pre-diabetics

Pls advise

Tks

Dr. Riaz Reply
August 12, 2020

After one hour is normal. If you want to be sure please get check HbA1c.
https://www.labpedia.net/diabetes-mellitus-part-4-glucose-tolerance-test-g-t-t-oral-glucose-tolerance-test-ogtt-gestational-diabetes-mellitus/
See this link as well.

Dr. Riaz Reply
August 16, 2020

Your Glucose level is within normal range. Please advise HbA1c.

Asad Reply
August 25, 2023

“Is 80 postprandial sugar after 2 hours eating normal?”

Dr. Riaz Reply
August 25, 2023

After 2 hours 80 mg/dL is normal, but now doubt it is below the normal range. Please check your fasting glucose.

Add Comment Cancel



The reCAPTCHA verification period has expired. Please reload the page.

  • Lab Tests
    • Blood banking
    • Chemical pathology
    • CSF
    • Cytology
    • Fluid analysis
    • Fungi
    • Hematology
    • Immune system
    • Microbiology
    • Parasitology
    • Pathology
    • Tumor marker
    • Urine Analysis
    • Virology

About Us

Labpedia.net is non-profit health information resource. All informations are useful for doctors, lab technicians, nurses, and paramedical staff. All the tests include details about the sampling, normal values, precautions, pathophysiology, and interpretation.

[email protected]

Quick Links

  • Blog
  • About Us
  • Contact
  • Disclaimer

Our Team

Professor Dr. Riaz Ahmad Bhutta

Dr. Naheed Afroz Syed

Dr. Asad Ahmad, M.D.

Dr. Shehpar Khan, M.D.

Copyright © 2014 - 2025. All Rights Reserved.
Web development by Farhan Ahmad.