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Pregnancy Test (Qualitative Human Chorionic Gonadotropin, HCG)

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

This test checks for the presence of human chorionic gonadotropin (HCG), a hormone produced after successful implantation of a fertilized egg. It helps determine if you are pregnant.

Quick summary

["A positive result confirms pregnancy; a negative result suggests no pregnancy at this time."]

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

Key facts at a glance

LOINC
66562-0
Short code
Pregnancy test required PhenX
Synonyms
Pregnancy test required PhenX
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Critical range
0.5 N/A – —
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
phenx
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

What Does This Test Measure?

The test detects HCG, a hormone produced by the placenta shortly after a fertilized egg implants in the uterus. Elevated levels indicate pregnancy, while low or absent levels do not.

How Is This Test Performed?

This is a urine test. You may collect a midstream urine sample or use a home pregnancy test kit. Your lab technician may also use a specific urine specimen for more precise analysis.

Why Might I Need This Test?

Doctors order this test to confirm pregnancy, especially if you have missed menstrual periods or suspect pregnancy. It can also be used for early pregnancy detection or monitoring in certain medical situations.

What Are Common Results?

A positive result means HCG is detected, suggesting pregnancy. A negative result means HCG is not detected at this time, indicating no pregnancy. Results may vary slightly depending on the test method and timing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HCG Urine Test

Frequently asked questions

What does a positive result mean?
A positive result strongly suggests pregnancy. However, it’s important to confirm with your healthcare provider, as other conditions can sometimes cause a false positive.
Can I take this test at home?
Yes, many home pregnancy tests use a similar principle to confirm pregnancy. However, lab tests may provide more detailed results and are often used for confirmation or further evaluation.
How soon can I get a positive result?
Results may appear as early as 7–10 days after a missed period, depending on the test and individual hormone levels. Lab tests may detect HCG slightly earlier than home tests.
  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