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Erythropoiesis-Stimulating Agent (ESA) Monitoring – Serum/Plasma Concentration

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

This test measures the level of an erythropoiesis-stimulating agent (ESA) in your blood. ESAs are medications used to increase red blood cell production, often prescribed for conditions like anemia.

Quick summary

["Your doctor may check this level to ensure your medication is working safely and effectively."]

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

Key facts at a glance

LOINC
71458-4
Short code
WASERYTHROPOIESISSTIMULATINGAGENTPRESCRIBED
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
esrd
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 This Test Is Done

Your healthcare provider may order this test if you’re taking an ESA to treat anemia, kidney disease, or other conditions that affect red blood cell production. It helps monitor your response to treatment and adjust doses as needed.

What to Expect Before the Test

No special preparation is usually required. You may have a small needle inserted into your arm or vein to draw a blood sample. If you’re on anticoagulants, let your provider know before the test.

What the Test Results Mean

Results help determine if your ESA dose is appropriate. Too high or too low levels can affect your blood health. Your doctor will discuss findings with you during your follow-up visit.

Common Reasons for Testing

This test may be done during regular check-ups, after starting ESA treatment, or if you experience symptoms like fatigue, shortness of breath, or unusual bleeding.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Uncontrolled ESA levels can lead to serious side effects, such as high blood pressure, blood clots, or iron overload. Regular monitoring ensures safe and effective dosing, balancing benefits with risks for your condition.

Short name

ESA Level

Frequently asked questions

What does an abnormal ESA level mean?
An abnormal result may indicate your medication isn’t working as intended or that your dose needs adjustment. Your doctor will review the results with you and may change your treatment plan if needed.
Can I eat or drink before this test?
You can eat and drink normally unless instructed otherwise. Avoid alcohol before the test, as it may affect blood chemistry.
How long will I need to wait for my results?
Results are typically available within a few days to a week, depending on your lab’s processing time. Your doctor will contact you with the findings during your next appointment.
  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