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Estrogen (Total) in Serum or Plasma

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

This test measures the total amount of estrogen hormones in your blood. Estrogen is a key hormone in women and plays a role in regulating menstrual cycles, pregnancy, and bone health. In men, it supports libido and overall health.

Quick summary

["Your estrogen levels help doctors assess reproductive health, hormone balance, and potential conditions like perimenopause or hormonal imbalances."]

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

Key facts at a glance

LOINC
98134-0
Short code
ESTROGENUSE
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might Be Ordered

Doctors may request this test to evaluate symptoms such as irregular periods, hot flashes, or signs of hormonal disorders. It can also be used during fertility evaluations, before surgeries like hysterectomies, or to monitor hormone replacement therapy.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours if the test involves drawing blood from a vein. If you’re taking certain medications (like birth control), let your provider know.

How the Test Works

A small sample of blood is drawn from a vein in your arm. The sample is then analyzed in a lab to measure the total estrogen concentration, which includes both active and bound forms of the hormone.

What the Results Mean

Results are compared to a reference range specific to your age, sex, and medical history. Abnormal levels may indicate conditions like polycystic ovary syndrome (PCOS), ovarian dysfunction, or thyroid disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Total Estrogen

Frequently asked questions

When might I need follow-up testing?
If your results are outside the expected range, your doctor may recommend additional tests (like follicle-stimulating hormone or luteinizing hormone) or further monitoring to understand the cause.
What causes estrogen levels to fluctuate?
Estrogen levels can rise or fall due to age, pregnancy, menopause, medications (like birth control), stress, or certain medical conditions. Lifestyle factors like diet, exercise, and weight also play a role.
Can I adjust my diet or lifestyle to influence estrogen levels?
While you can’t directly control estrogen levels, maintaining a balanced diet, staying active, and managing stress may help support hormonal health. Always consult your doctor before making major lifestyle changes.
  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