Hemoglobin (Mass Concentration) in Whole Blood
This test measures the amount of hemoglobin in your red blood cells, which carries oxygen throughout your body. Hemoglobin levels help assess your overall health, especially your ability to deliver oxygen to tissues.
["Hemoglobin levels indicate whether you may have anemia or other blood-related conditions."]
Key facts at a glance
- LOINC
- 4609-4
- Short code
- Hgb M-Milw Bld Ql
- Synonyms
- Hgb M-Milw 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
Why Is This Test Done?
Doctors order hemoglobin tests to check for anemia (low red blood cell count), detect blood loss, evaluate chronic diseases, or monitor conditions like kidney disease or heart problems. It’s also part of routine blood work, including during pregnancy or before surgeries.
What to Expect Before the Test
You’ll typically have a small needle inserted into your arm or hand to draw a blood sample. It may cause a brief pinch or discomfort, but most people tolerate it well. No special preparation is needed unless your doctor instructs otherwise.
What Happens During the Test?
The blood sample is collected in a tube and sent to a lab, where it’s analyzed to measure hemoglobin concentration. The test usually takes a few minutes, and results are ready within 24 hours or less.
What Are Normal Results?
Normal hemoglobin levels vary by age, sex, and health status. Your doctor will compare your results to your specific reference range and discuss them with you.
Reference range
Adult males: 13.5-17.5 g/dL; Females: 12.0-16.0 g/dLN/A
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.
Low hemoglobin levels (anemia) may cause fatigue, pale skin, shortness of breath, or weakness. High levels (polycythemia) could indicate dehydration, lung disease, or other conditions. Your doctor will interpret results in the context of your symptoms and medical history to guide further care.
Short name
Hemoglobin (Hb)
Frequently asked questions
How long does it take to get my hemoglobin test results?
Can I eat or drink before my hemoglobin test?
What does a low hemoglobin level mean?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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