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Hemoglobin (Mass Concentration) in Whole Blood

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of hemoglobin, the protein in red blood cells that carries oxygen throughout your body.

Quick summary

["Hemoglobin helps determine if you have healthy red blood cells and whether you may need treatment for anemia or other blood-related conditions."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
4606-0
Short code
Hgb M-Boston Bld Ql
Synonyms
Hgb M-Boston Bld Ql
Category
hematology
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
12
Ref high
17.5
Critical range
7 N/A – 20 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85018
SNOMED
900000000000003004
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Is Hemoglobin Used For?

Hemoglobin levels are commonly checked to diagnose or monitor conditions like anemia, which occurs when your body doesn’t have enough healthy red blood cells. It can also help identify issues with blood production, chronic diseases, or blood loss. Your doctor may order this test during routine check-ups, before surgeries, or if you experience symptoms like fatigue, pale skin, or shortness of breath.

How Is the Test Performed?

A small blood sample is taken from a vein, usually in your arm. The sample is then sent to a lab where it is analyzed to measure hemoglobin concentration. This process is quick and typically done in a doctor’s office or clinic.

What Might Affect Your Results?

Several factors can influence hemoglobin levels, including recent blood loss, iron deficiency, pregnancy, certain medications, or chronic illnesses like kidney disease or liver problems. Smoking or alcohol use may also impact results.

Common Reasons for Testing

Your doctor might recommend this test if you have symptoms like extreme tiredness, weakness, pale or yellowish skin, rapid heartbeat, or dizziness. It’s also used to screen for anemia in children, pregnant women, or individuals with risk factors like poor diet or frequent blood donations.

Reference range

Adult males: 13.5-17.5 g/dL; Females: 12.0-16.0 g/dLN/A

Specimen: whole-blood

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Hemoglobin (Hgb)

Frequently asked questions

Why is this test important in diagnosing health conditions?
Hemoglobin levels are critical for diagnosing anemia, which can stem from low iron, vitamin deficiencies, or other blood disorders. High levels may indicate polycythemia (too many red blood cells), while very low levels can signal severe blood loss or other systemic health issues. Regular monitoring helps manage chronic conditions and ensures proper treatment planning.
What are the typical reference ranges for adults?
Reference ranges vary by lab and age. For adults, typical ranges are around 12 to 18 grams per deciliter (g/dL) for women and 14 to 18 g/dL for men. Your doctor will compare your results to your specific lab’s standards and your personal health history.
Can lifestyle changes impact hemoglobin levels?
Yes, lifestyle factors like diet (especially iron-rich foods), exercise, and avoiding smoking can influence hemoglobin levels. Eating foods high in iron, vitamin B12, and folate, staying hydrated, and managing chronic conditions like diabetes or heart disease may help maintain healthier hemoglobin levels.
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy