Nadia, comparing two reports
HbA1c 42
6 %
HbA1c IFCC to Percentage Converter
The HbA1c IFCC to Percentage Converter switches a reading between common units. IFCC mmol/mol × 0.09148 + 2.152 gives an approximate NGSP percentage. Units only, not a diagnosis. It does not say whether the number is healthy. Take the original printout to your GP if you need it interpreted.
Your details
Type the mmol/mol figure from a UK letter.
What is this calculator?
The HbA1c IFCC to Percentage Converter switches a reading between common units. IFCC mmol/mol × 0.09148 + 2.152 gives an approximate NGSP percentage. Units only, not a diagnosis. It does not say whether the number is healthy. Take the original printout to your GP if you need it interpreted.
How it works
- Type the figure in the unit on your letter or device.
- We convert with a published factor.
- Use the pair of units when you talk to a clinician. We do not diagnose.
Common questions
What is the hba1c ifcc to percentage converter?
Unit maths only. Same quantity, different label.
Which unit does the NHS use?
UK lab letters often use SI units. Keep the original unit on the printout as well as the conversion.
Can I treat the converted number as a target?
No. Conversion does not change meaning. Ask the clinician who ordered the test.
Example scenarios
Trevor, a reminder on the fridge
HbA1c 51.2
6.8 %
Amelia, letter from the clinic
HbA1c 32.8
5.2 %
Understanding your results
If the two units disagree with the letter, trust the letter. Rounding to one decimal is enough for home use.
About this result
Guidance only. Calculations run in your browser. Numbers are estimates, not a diagnosis.
How we calculate
IFCC mmol/mol × 0.09148 + 2.152 gives an approximate NGSP percentage. Units only, not a diagnosis.
Sources
Limitations
- Units only.
- Not a diagnosis.
- Keep the original printout.
When to seek help
Speak to a GP or call NHS 111 if you are worried. Call 999 in an emergency.
Spotted an error? Request a correction or read our editorial policy.