Definition
What Hemoglobin measures
Hemoglobin is the iron-containing protein inside red cells that binds and delivers oxygen. It is the primary number used to define anemia.
Illustrative sample band · Synthetic
15g/dL
13Sample target 14–17 g/dL18
Why it matters
How clinicians usually read it
It connects directly to how you feel: fatigue, exercise tolerance, and recovery all track oxygen delivery. It also anchors the HbA1c measurement on this panel.
When it reads low
A lower value can mean
A low hemoglobin defines anemia; iron shortfall is the most common cause, with B12, chronic disease, and blood loss on the same list. Ferritin and iron studies sharpen the answer.
When it reads high
A higher value can mean
A high hemoglobin can follow dehydration, smoking, altitude, or low overnight oxygen. Persistently high values deserve a clinical look.
Questions for a clinician
Bring the number into a real conversation
01
If this is low, do my ferritin and iron studies explain it?
02
Could sleep apnea or smoking be behind a high value?
03
Does my hemoglobin status change how we read my HbA1c?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for Hemoglobin.