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Hemoglobin Concentration in Red Blood Cells (Red Cell Hemoglobin Content)

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

This test measures the total amount of hemoglobin contained within your red blood cells. Hemoglobin is the protein that carries oxygen throughout your body.

Quick summary

["Understanding your red blood cell hemoglobin levels helps assess your body’s ability to transport oxygen efficiently."]

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

Key facts at a glance

LOINC
48707-4
Short code
Hgb C Cry RBC Ql Micro
Synonyms
Hgb C Cry RBC Ql Micro
Category
hematology
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
4.2
Ref high
5.9
Critical range
7 N/A – 20 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
CPT
85041
SNOMED
900000000000003001
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

Why This Test Might Be Ordered

Your healthcare provider may order this test to evaluate conditions affecting red blood cell production, such as anemia (low red blood cell counts), iron deficiency, or other blood disorders. It can also help diagnose or monitor certain blood diseases or reactions to treatments.

What to Expect During the Test

A simple blood draw is typically used to collect a small sample from a vein in your arm. The test involves processing the blood to measure hemoglobin content within red blood cells, often using automated laboratory techniques.

Common Conditions Monitored or Diagnosed

This test can help identify or monitor conditions like thalassemia, sickle cell disease, or other inherited blood disorders. It may also be used to assess how well your body is responding to treatments for anemia or other blood-related issues.

What the Results Mean

Results are interpreted in the context of your overall health and medical history. Abnormally low levels might indicate anemia or other blood disorders, while abnormal high levels could suggest conditions like polycythemia or dehydration.

Reference range

Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A

Specimen: whole-blood

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Red Cell Hemoglobin Mass

Frequently asked questions

What causes abnormal results in this test?
Abnormal results can be caused by various factors, including genetic conditions, chronic diseases, infections, or certain medications. For example, low hemoglobin in red blood cells may result from insufficient iron, vitamin B12, or folate, while high levels could be due to overproduction of red blood cells or fluid loss.
How often should I get this test?
The frequency of this test depends on your medical condition and healthcare provider’s recommendations. If you have a chronic condition like anemia, your provider may order it regularly to monitor your progress. Otherwise, it might be ordered as needed for specific symptoms or diagnostic purposes.
Can lifestyle changes affect this test?
Yes, lifestyle factors such as diet (especially iron, vitamin B12, and folate intake), hydration status, and certain medications can influence red blood cell hemoglobin levels. Discuss any changes in your diet, supplements, or medications with your healthcare provider before or after the test.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

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