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Red Blood Cell (RBC) Hemoglobin Concentration Rate

Published: August 9, 2026Updated: August 17, 2026

This test measures how quickly red blood cells release hemoglobin, which carries oxygen throughout your body. It helps assess your body’s ability to efficiently transport oxygen.

Quick summary

["Understanding how fast your RBCs release hemoglobin can help identify issues with oxygen delivery."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
59830-0
Short code
RBC 3h UrnS Micro-nRate
Synonyms
RBC 3h UrnS Micro-nRate
Category
chemistry
Sample
urine
Container
Sterile urine container
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
microscopy-light
CPT
85041
SNOMED
900000000000003001
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Does This Test Measure?

This test evaluates the rate at which hemoglobin is released from red blood cells. Hemoglobin is the protein in RBCs that binds and transports oxygen from the lungs to tissues. Measuring this rate can help determine how effectively your body is using oxygen at the cellular level.

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like fatigue, shortness of breath, or signs of anemia (e.g., pale skin, weakness). It can also be part of a broader evaluation for conditions affecting red blood cell function or oxygen transport.

How Is This Test Performed?

Blood is drawn from a vein, typically in your arm. The sample is processed to measure the rate at which hemoglobin is released from red blood cells under controlled conditions. This is usually done using a specialized laboratory method.

What Are Common Causes?

Abnormal rates of hemoglobin release from RBCs can occur due to underlying conditions such as anemia (e.g., iron deficiency, sickle cell disease), hemolytic anemia (where RBCs are destroyed prematurely), or certain blood disorders. It may also be influenced by chronic diseases, infections, or medications.

Reference range

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

Specimen: urine

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

RBC Hemoglobin Rate

Frequently asked questions

How often will I need this test?
This test is typically not a routine screening test. It may be ordered occasionally as part of a specific evaluation, such as diagnosing anemia, assessing oxygen transport issues, or monitoring certain blood disorders. Your healthcare provider will determine the need based on your symptoms and medical history.
What do my results mean?
Results are not provided as a single numeric range since this is a rate-based measurement. Instead, your provider will interpret the results in relation to your clinical picture, comparing them to your baseline or other relevant tests. Abnormal findings may prompt further testing or evaluation.
Can I prepare for this test?
No special preparation is usually needed for this test. However, inform your healthcare provider about any medications you are taking, recent illnesses, or conditions that might affect blood results, such as dehydration or infections.
  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 17, 2026. · Read our editorial policy