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Ectopic Pregnancy Screening (Human Chorionic Gonadotropin, Serum)

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

This test measures a hormone (human chorionic gonadotropin, or hCG) produced during pregnancy. It helps detect whether a pregnancy is developing normally or outside the uterus (ectopic).

Quick summary

["Ectopic pregnancies can be life-threatening; early detection with hCG testing is critical."]

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

Key facts at a glance

LOINC
33065-4
Short code
Ectopic preg
Synonyms
Ectopic preg
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
reported
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 Matters for Pregnancy Planning

A positive hCG result confirms pregnancy, but elevated levels or irregular patterns may signal complications, including ectopic pregnancy. Your healthcare provider will use these results alongside other tests and symptoms to guide next steps.

How the Test Works

Blood is drawn to measure hCG levels. This hormone peaks early in a normal pregnancy but may rise differently in ectopic pregnancies, where it often remains low or fluctuates unpredictably.

What to Expect Before the Test

No special preparation is needed, but inform your provider if you’re taking medications that could affect hormone levels. Avoid alcohol or smoking before the draw for clearer results.

Common Results and Next Steps

Low or undetectable hCG may indicate early pregnancy loss or an ectopic pregnancy. High, rapidly rising levels suggest a normal intrauterine pregnancy. Follow-up testing or imaging (like ultrasounds) will be recommended based on your results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

hCG screening

Frequently asked questions

What does an abnormal hCG level mean?
An abnormal hCG level—such as a low or irregular pattern—may signal an ectopic pregnancy, which requires immediate medical attention. Always discuss results with your healthcare provider, as they’ll interpret them in the context of your symptoms and medical history.
How often should I get retested if my hCG levels are low?
If your hCG levels are low or rising too slowly, your provider may recommend retesting every 48–72 hours to monitor progression. This helps determine whether the pregnancy is viable or requires intervention.
Can diet or lifestyle affect hCG test results?
While diet and lifestyle factors (like smoking or alcohol) can influence overall health, they do not directly alter hCG levels. However, they may impact your body’s ability to sustain a pregnancy, so maintaining a healthy lifestyle is always recommended.
  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