Hemoglobin concentration in whole blood (autoanalyzer method)
This test measures the amount of hemoglobin in your blood, which carries oxygen to your body’s tissues. Hemoglobin levels help doctors assess whether you have enough red blood cells to stay healthy.
["Hemoglobin levels indicate your body’s ability to deliver oxygen effectively."]
Key facts at a glance
- LOINC
- 71833-8
- Short code
- Hct VFr.DF Bld Auto
- Synonyms
- Hct VFr.DF Bld Auto
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 36
- Ref high
- 50
- Critical range
- 18 N/A – 60 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- automated-count
- CPT
- 85014
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why is this test done?
Your healthcare provider may order this test to check for anemia (low red blood cells), polycythemia (too many red blood cells), or other blood-related conditions. It’s also used during pregnancy, before surgeries, or if you have symptoms like fatigue, shortness of breath, or pale skin.
What does a low or high hemoglobin level mean?
Low hemoglobin may signal anemia, iron deficiency, or blood loss, while high levels could indicate conditions like dehydration, polycythemia, or certain lung diseases. Your results will be compared to standard ranges for your age and sex.
How is this test performed?
A small blood sample is drawn from a vein in your arm. The blood is then analyzed automatically to measure hemoglobin concentration, which is reported as a percentage or grams per deciliter (g/dL).
What do my results mean?
Your results will be reviewed by your healthcare provider alongside other tests and your medical history. They’ll help determine if further testing or treatment is needed, such as adjusting medications or addressing underlying health issues.
Reference range
Adult males: 38-50%; Females: 36-44%N/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.
Clinical significance: Hemoglobin is critical for oxygen transport. Abnormal levels can signal systemic health risks, including chronic diseases, infections, or nutritional deficiencies. Regular monitoring is especially important for patients with conditions like heart disease, kidney problems, or those undergoing chemotherapy.
Short name
Hemoglobin (Hb) Level
Frequently asked questions
What causes hemoglobin levels to change?
How often should I get this test?
Can lifestyle changes affect hemoglobin levels?
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 17, 2026. · Read our editorial policy