Full blood count

Haemoglobin

Your laboratory may print this as HB, Hgb, Hemoglobin. Usually reported in g/dL.

On your report

NameHaemoglobin

Also printed asHB · Hgb · Hemoglobin

Usual unitg/dL

Reference rangePrinted by your own laboratory. We publish none of our own.

Comparing two results

A change under about 7.5% may be nothing at all

Haemoglobin varies within the same healthy person from day to day — for this value, by about 2.7%. So two results can differ without anything having changed. Below roughly 7.5%, a difference is as likely to be ordinary variation as anything else.

This figure is a lower bound, deliberately. The full calculation also includes the variation of the specific machine that ran your sample, which belongs to your laboratory and differs between them. Leaving it out makes the threshold smaller, so this flags changes that may turn out to be nothing — rather than missing ones that matter.

Biological variation figure from the EFLM BVD meta-analysis, whole blood, updated 13/4/2026. Calculated as 2.77 × CV_I.

What MedicaCare AI does with this value

Photograph the report and you get your own haemoglobin explained against the range your laboratory printed — plus every other value on the page, and somewhere to ask what you actually want to know.

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Usually printed alongside it

Haematocrit Red cell count Mean cell volume Mean cell haemoglobin MCHC White cell count