Connect with others who understand.

  • Learn from expert-reviewed resources
  • Real advice from people who’ve been there
  • People who understand what you’re going through
Sign Up Log In
Powered By
Real members of DiabetesTeam have posted questions and answers that support our community guidelines, and should not be taken as medical advice. Looking for the latest medically reviewed content by doctors and experts? Visit our resource section.
A DiabetesTeam Member asked a question 💭
Durban, ZA

FBG 3.9
Post prandial
after oat bran, Greek yoghurt, 10 almonds and half a banana 3.7

I’ve reversed pre diagnosis.
Why are my readings so low

Hands scrupulously scrubbed before and after testing FBG
Hands dried completely with clean towel.
Alarm set for 2 hours after first bite.
Meter is fairly new.
Kit kept in clean towel.

October 6, 2025 (edited)
 · 
Reactions

Answer Summary

Members responded to concerns about consistently low blood sugar readings (3.7-3.9 mmol/L) despite careful testing practices, with several... Read more

Members responded to concerns about consistently low blood sugar readings (3.7-3.9 mmol/L) despite careful testing practices, with several sharing that non-diabetic individuals can naturally have readings in this range, though one member's son consistently tests below his fasting number due to producing more insulin than needed. Several members offered practical suggestions including adding honey or small carbohydrate-rich snacks between meals to address shakiness and nausea, while one member pointed out that IBS could be interfering with food absorption and contributing to the low readings. A recurring theme was the importance of monitoring symptoms like shakiness, nausea, and rapid heartbeat, and seeking medical evaluation to rule out underlying conditions, as readings at or below 3.9 mmol/L can indicate hypoglycemia that may require professional attention.

A DiabetesTeam Member

The blood glucose levels you reported, FBG 3.9 mmol/L and PP 3.7 mmol/L, are within or slightly below the normal non-diabetic range, which could indicate hypoglycemia (low blood sugar). You should contact a healthcare professional for a full evaluation.
Interpretation of Results (in mmol/L)
FBG (Fasting Blood Glucose) 3.9 mmol/L: The normal range for fasting blood glucose in a healthy adult is generally 3.9 to 5.6 mmol/L (70 to 100 mg/dL). Your reading of 3.9 mmol/L is at the lower end of the normal range. For some thin, young people, this might be a normal level; however, for many adults, a reading of 3.9 mmol/L (70 mg/dL) or lower is the threshold for hypoglycemia.
PP (Postprandial) 3.7 mmol/L: The postprandial test measures your blood glucose 2 hours after eating. Normal levels for a person without diabetes should be less than 7.8 mmol/L (140 mg/dL) two hours after a meal. Your reading of 3.7 mmol/L is below this range and lower than your fasting level, which is unusual. A blood sugar level below 4 mmol/L is considered low (hypoglycemia) and usually requires immediate action to raise it.
Potential Concerns and Next Steps
The primary concern with these readings is that they are at or below the threshold for hypoglycemia, especially the postprandial result. Hypoglycemia can cause symptoms such as dizziness, mood swings, fatigue, and chills.
It is important to:
Monitor Symptoms: Be aware of any symptoms of low blood sugar.
Consult a Healthcare Provider: The user should discuss these results with their doctor. These levels may be normal for some individuals, but they could also indicate an underlying condition (such as liver or kidney disease, or a rare pancreatic tumor called an insulinoma) or an effect of certain medications.
Consistency in Testing: Ensure you are consistently following the correct testing procedures (e.g., timing the PP test exactly 2 hours from the first bite of the meal).
Do Not Self-Diagnose: Only a medical professional can provide a proper diagnosis and recommend appropriate action based on your full medical history.

November 2, 2025
A DiabetesTeam Member

@A DiabetesTeam Member

Hello Margaret

Thank you very much for taking the time to respond.
I so appreciate it. .
Yes I feel dreadful in the mornings.
FBG is always low. Lowest has been 3.2.
I shake and feel very nauseous and have very rapid palpitations.
Unfortunately I have to watch what I eat because I have developed IBS, which in itself makes me very nauseous.
I’ll attach hereunder, what I found regarding the meter that I use.
You are correct about the 70.

In general:
* Below 5.7% is normal
* Between 5.7% and 6.4% is diagnosed as prediabetes
* 6.5% or higher on two separate tests indicates diabetes

Blood sugar values are expressed in milligrams of sugar per deciliter (mg/dL) or millimoles of sugar per liter (mmol/L) of blood. In general:

* Less than 100 mg/dL (5.6 mmol/L) is normal
* 100 to 125 mg/dL (5.6 to 6.9 mmol/L) is diagnosed as prediabetes
* 126 mg/dL (7.0 mmol/L) or higher on two separate tests is diagnosed as diabetes

Thank you again Margaret 💕🙏

I’ll be out for most of the day. I wish you a very happy and well day 🙏💕

October 8, 2025 (edited)
A DiabetesTeam Member

@A DiabetesTeam Member

Ahh Henry!
What a good idea!
Thank you my dear friend.
Love you always ❤️

October 6, 2025
A DiabetesTeam Member

Our middle baby boy is 36 years old. It doesn't matter what he eats. His 2 hour is alwqys at or below his before eating number.

He produces more insulin than he needs. He is not diabetic. Too bad I can't be more like him. He eats rice every day. He can eat half a large pizza for a meal.

Or a 16" hoagie from Carmens deli in Bellmawr, Camden County. Think a sub on steroids that can feed a family of 5 adults.

His numbers are always good. But I do a couple of test every 6 months anyway. His 2 hour numbers are always in the 3.6 to 3.9 range.

October 6, 2025
A DiabetesTeam Member

@A DiabetesTeam Member

Thank you so much Shaune.
These details are very explanatory and useful to me 🤗

November 3, 2025

Related Questions

View All
A DiabetesTeam Member asked a question 💭
Durban, ZA

Continue with Facebook
Continue with Google
By joining, you accept our Terms of Use, and acknowledge our collection, sharing, and use of your data in accordance with our Health Data and Privacy policies.
Already a member? Log In