Red Blood Cell (RBC) Hemoglobin Photometric Analysis (Erythrocyte Hemoglobin)
This test measures the amount of hemoglobin, the protein in red blood cells that carries oxygen, using a light-based method. It helps assess your blood’s ability to carry oxygen and can indicate conditions like anemia or iron deficiency.
["This test helps doctors check if your blood cells are healthy and working properly."]
Key facts at a glance
- LOINC
- 82477-1
- Short code
- Erythrocyte Sed Rat Bld Photometric
- Synonyms
- Erythrocyte Sed Rat Bld Photometric
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Ref low
- 4.2
- Ref high
- 5.9
- Critical range
- 2 N/A – 7 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- photometric
- CPT
- 85041
- 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 Is Done
Your doctor may order this test to diagnose or monitor conditions affecting red blood cells, such as anemia (low hemoglobin), iron deficiency, or other blood disorders. It’s also used in routine blood checks, especially if you have symptoms like fatigue, pale skin, or shortness of breath.
How the Test Works
A small blood sample is taken from your arm. The hemoglobin in your red blood cells is measured using photometry, a method that detects how much light a sample absorbs. This helps determine the concentration of hemoglobin in your blood.
What to Expect Before the Test
No special preparation is needed for this test. You may be asked to fast if your doctor is also checking other blood components, but this test itself doesn’t require fasting. Wear comfortable clothing if you need a blood draw.
What to Expect During the Test
The blood sample is taken from a vein in your arm using a needle. It usually takes a few minutes, and you may feel a slight pinch. Afterward, a bandage will be applied to the site. The test itself is quick and painless.
Reference range
Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/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 indicate conditions like iron deficiency, vitamin B12 or folate deficiency, chronic illness, or blood loss. High levels could suggest polycythemia (too many red blood cells) or dehydration. Monitoring this test helps guide treatment for anemia or other blood disorders.
Short name
RBC Hemoglobin
Frequently asked questions
What does a low or high hemoglobin result mean?
Can I eat or drink before this test?
How long will it take to get my results?
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