Hemoglobin (Hb) concentration in whole blood

Why This Test Matters for Your Health

Hemoglobin is essential for delivering oxygen from your lungs to your body’s tissues. Low levels may indicate anemia, blood loss, or other health issues, while high levels could suggest conditions like polycythemia or dehydration. Your doctor may order this test to monitor chronic diseases, screen for anemia, or assess overall health.

How the Test Works

A small blood sample is taken from your arm, usually while you’re sitting comfortably. The sample is analyzed to measure hemoglobin concentration, which is expressed in units of grams per deciliter (g/dL). This test is quick and painless, often done during routine check-ups or when symptoms suggest a need for blood evaluation.

What to Expect Before or After the Test

There are usually no special preparations needed for this test. You may feel slight discomfort from the needle, but it typically resolves quickly. If you’re pregnant, have a bleeding disorder, or take blood thinners, let your healthcare provider know before the test.

Common Reasons for This Test

Doctors may order hemoglobin tests to diagnose or monitor conditions like anemia (low red blood cells), iron deficiency, or other blood disorders. It’s also used in newborn screening, during pregnancy to check for anemia, or when evaluating symptoms like fatigue, pale skin, or shortness of breath.