Hemoglobin Blood Test: What Your Hemoglobin Level Means
Your hemoglobin level is more than just another number on your blood test.
If you've recently received a CBC blood test, you may have noticed a result labelled:
Hemoglobin - Hb
You may also have seen it written as Hgb.
But what does hemoglobin actually do?
And what does it mean if your hemoglobin is low or high?
Let's break it down.
What is hemoglobin?
Hemoglobin is a protein found inside red blood cells.
Its primary role is to carry oxygen from your lungs to tissues throughout your body and help transport carbon dioxide back toward the lungs.
That's why hemoglobin is such an important part of a complete blood count.
When you receive a CBC report, your hemoglobin result is usually considered alongside other measurements such as:
* Red blood cell count
* Hematocrit
* MCV
* MCH
* MCHC
* RDW
Looking at these values together can provide much more information than looking at hemoglobin alone.
What is a normal hemoglobin level?
There isn't one universal hemoglobin number that applies to every person.
Reference ranges can vary depending on factors such as age, sex, pregnancy status, altitude and the laboratory performing the test.
Your laboratory report will usually provide its own reference range.
That is important because a result marked “low” or “high” should be interpreted using the appropriate reference range rather than an arbitrary number found online.
What does low hemoglobin mean?
A low hemoglobin level can be associated with anemia.
But anemia isn't one single disease.
There are many possible causes, including iron deficiency, vitamin deficiencies, blood loss, chronic diseases and inherited conditions.
That means:
Low hemoglobin ≠ automatically iron deficiency.
This is an important distinction.
If your hemoglobin is low, your healthcare professional may consider your symptoms, medical history and other blood-test results before determining what additional evaluation may be appropriate.
What symptoms can occur with anemia?
Depending on the severity and underlying cause, anemia can be associated with symptoms such as:
* Tiredness
* Weakness
* Shortness of breath
* Dizziness
* Headaches
* Pale skin
However, symptoms vary considerably, and some people may have few or no obvious symptoms.
If you have concerning or persistent symptoms, discuss them with a qualified healthcare professional.
What can cause high hemoglobin?
A high hemoglobin result can also have multiple explanations.
For example, dehydration can affect blood concentration, while living at high altitude, smoking and certain medical conditions can also be associated with higher hemoglobin levels.
So if your report shows a high hemoglobin level, don't immediately assume that you have a particular disease.
The number needs context.
Why your CBC matters
Imagine your laboratory report says:
Hemoglobin: Low
It is tempting to immediately search:
> “How can I increase my hemoglobin?”
But there may be a better first question:
> “Why is my hemoglobin low?”
That question can lead to a much more useful conversation with your healthcare professional.
Your doctor may consider your:
Hb + RBC + MCV + MCH + RDW + symptoms + medical history + other tests
rather than looking at one number in isolation.
Should you take iron if your hemoglobin is low?
This is a common question.
Don't automatically start iron supplements simply because your hemoglobin is low.
Iron deficiency is one possible cause of anemia, but it isn't the only one.
Taking supplements without knowing the cause may not address the underlying problem.
Your healthcare professional can determine whether iron deficiency is likely and whether additional testing or treatment is appropriate.
Your blood report shouldn't be a mystery
A CBC can contain a surprising amount of information.
You might see:
Hb
RBC
WBC
MCV
MCH
MCHC
RDW
Platelets
For someone without a medical background, these abbreviations can look like another language.
This is exactly where having access to understandable health information can be useful.
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Your health questions don't stop when your appointment ends.
You receive your blood report.
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You see a number marked “L”.
And suddenly you have questions.
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Healthcare information can be complicated.
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Medical disclaimer
This article is for general educational purposes and is not intended to diagnose, treat or prevent any medical condition. Hemoglobin reference ranges vary by laboratory and individual circumstances. A low or high hemoglobin result can have many possible causes. Discuss your results and symptoms with a qualified healthcare professional before making decisions about treatment or supplements.
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