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Human Chorionic Gonadotropin (hCG) Serum Level

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

This test measures the amount of human chorionic gonadotropin (hCG), a hormone produced after successful implantation of a fertilized egg in early pregnancy.

Quick summary

["The hCG test helps confirm pregnancy and monitor conditions like ectopic pregnancy or molar pregnancy."]

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

Key facts at a glance

LOINC
44839-9
Short code
HCG Ser Cont Ql
Synonyms
HCG Ser Cont Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
5
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84702
SNOMED
275917004
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 Is This Test Done?

Your healthcare provider may order an hCG test if you suspect you might be pregnant, after a missed period, or during pregnancy to check for normal development or other issues.

When During Pregnancy Is It Taken?

hCG levels are typically measured early in pregnancy, often as early as 7–10 days after conception, but results can vary. It may also be checked later to monitor growth or detect complications.

What Does a Positive Result Mean?

A positive hCG result strongly suggests pregnancy, though very early levels may be too low to confirm. False positives can occur in certain medical conditions, so follow-up testing may be needed.

What If Results Are Abnormal?

High levels may indicate pregnancy, but very high levels could signal complications like molar pregnancy. Low levels may suggest early pregnancy loss, ectopic pregnancy, or other issues requiring further evaluation.

Reference range

Non-pregnant: <5 mIU/mLN/A

Specimen: serum

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.

This test is critical for diagnosing pregnancy, assessing viability, and identifying potential complications early. It is also used in fertility treatments and monitoring certain non-pregnancy-related conditions that affect hCG production.

Short name

hCG Test

Frequently asked questions

When will I get my results?
Results are usually available within 1–3 business days, depending on lab processing times. Your healthcare provider will discuss them with you.
What if I have a positive home pregnancy test but a negative lab hCG test?
A home pregnancy test detects hCG in urine, which can be slightly different from serum levels measured in a lab. If you’re concerned, ask your provider to retest after a few days.
Can I eat or drink before this test?
No special preparation is needed, but avoid alcohol and smoking before testing, as they may affect results.
  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