FBS Reader: Check Your Fasting Blood Sugar Result Online

Q: Can I drink water before an FBS test?

Usually yes — plain water is allowed before an FBS test. However, avoid sweetened beverages, tea, coffee, or any food for at least 8 hours before the test. Always follow your laboratory's or doctor's specific instructions.

Questions Your Value Result

A few quick questions

Please answer the questions below so we can give you the correct interpretation.

1. Are you a diabetes patient?

2. Are you pregnant?

3. Do you have any other illness besides diabetes?

Enter your FBS value

Type in the number from your report. The unit will be detected automatically for most values.

Please select your unit:

Your Result

Your Entered Details

FBS Result Interpretation

⚠️ Important Medical Note

The blood sugar target values mentioned here are general reference ranges commonly used for individuals with diabetes who do not have significant additional medical conditions. Blood glucose targets may need to be individualised in patients with other health conditions such as:

Pregnancy
Kidney disease or liver disease
Heart disease
Severe infections
Endocrine disorders
Advanced age
Recurrent low blood sugar episodes (Hypoglycaemia)

Certain medications, including steroids, may also affect target values and interpretation of results. Always consult your doctor or a qualified healthcare professional for personalised advice and treatment targets appropriate to your medical condition.

Understanding Your FBS Result: Normal Blood Sugar Ranges

A fasting blood sugar (FBS) test — also called a fasting glucose test — measures the glucose level in your blood after at least 8 hours of fasting. It is one of the most commonly ordered blood investigations in Sri Lanka, used to screen for prediabetes and diabetes.

FBS Normal Range Table

Category	mg/dL	mmol/L
Normal	Below 100 mg/dL	Below 5.6 mmol/L
Prediabetes	100 – 125 mg/dL	5.6 – 6.9 mmol/L
Diabetes	126 mg/dL or above	7.0 mmol/L or above
Dangerously High	300 mg/dL or above	16.7 mmol/L or above

What Each FBS Result Range Means

Normal (below 100 mg/dL / 5.6 mmol/L): Your fasting blood sugar is within the normal range. Continue a healthy lifestyle with a balanced diet, regular physical activity, and periodic check-ups.

Prediabetes (100–125 mg/dL / 5.6–6.9 mmol/L): Your blood sugar is higher than normal but not yet in the diabetes range. This is a warning stage. Lifestyle changes — healthy diet, exercise, and weight management — can often prevent progression to diabetes.

Diabetes (126 mg/dL / 7.0 mmol/L or above): A result of 126 mg/dL or higher on two separate tests is used to diagnose diabetes. This requires proper medical evaluation and management. Consult your doctor promptly.

Dangerously High (300 mg/dL / 16.7 mmol/L or above): This level requires urgent medical attention. Do not delay — seek care immediately.

Important Notes on FBS Interpretation

FBS values may differ in certain situations:

• Pregnancy: A normal FBS in pregnancy is below 92 mg/dL (5.1 mmol/L) — lower than the standard threshold.
• Diabetes patients: The satisfactory control range is typically 80–130 mg/dL (4.4–7.2 mmol/L).
• Stress and illness: Can temporarily raise blood sugar even in non-diabetic individuals.
• Single high reading: One elevated result does not confirm a diagnosis — repeat testing is usually recommended.

Symptoms of High Blood Sugar

Recognising the symptoms of elevated blood sugar can help you seek timely medical care:

💧 Excessive thirst
🚽 Frequent urination
😴 Unusual fatigue
⚖️ Unexplained weight loss
🫥 Blurred vision
🩹 Slow-healing wounds
🦶 Tingling in hands or feet
🤢 Nausea or headache

Frequently Asked Questions About Fasting Blood Sugar

Common questions about FBS normal ranges, diabetes diagnosis, and fasting glucose interpretation — answered by Sineth Hospitals.

What is a normal fasting blood sugar level? ▼

A normal fasting blood sugar level is below 100 mg/dL (5.6 mmol/L). Values between 100–125 mg/dL (5.6–6.9 mmol/L) indicate prediabetes, and values of 126 mg/dL (7.0 mmol/L) or higher may indicate diabetes. Use the FBS Reader tool above to check your own result instantly.

What FBS level indicates diabetes? ▼

An FBS value of 126 mg/dL (7.0 mmol/L) or higher, confirmed on two separate occasions, is used to diagnose diabetes. A single elevated reading may be repeated before a diagnosis is confirmed. Always consult your doctor for proper evaluation and diagnosis.

Is 110 fasting blood sugar normal? ▼

No. A fasting blood sugar of 110 mg/dL (6.1 mmol/L) falls in the prediabetes range (100–125 mg/dL). This means your blood sugar is higher than normal but not yet in the diabetes range. Lifestyle changes — a healthy diet, regular exercise, and weight management — can often prevent progression to diabetes. Consult your doctor for personalised advice.

Can stress increase fasting blood sugar? ▼

Yes. Physical or emotional stress and illness can temporarily raise blood sugar levels by triggering the release of stress hormones such as cortisol and adrenaline. A single high reading during or after a stressful period should be confirmed with a repeat FBS test when you are well.

Should I repeat my FBS test? ▼

Doctors typically recommend repeating the FBS test if results are borderline or abnormal. A single elevated result does not always confirm a diagnosis — a second test is usually done on a different day. If your result is dangerously high or you have symptoms, seek medical attention promptly without waiting for a repeat test.

Can I drink water before an FBS test? ▼

Usually yes — plain water is generally allowed before an FBS test. However, avoid sweetened beverages, tea, coffee, fruit juice, or any food for at least 8 hours before the test. Always follow your laboratory's or doctor's specific instructions, as requirements may vary.

FBS Reader – Understand Your Fasting Blood Sugar Result