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Pregnancy Test (Qualitative Human Chorionic Gonadotropin, HCG)

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

This test detects the presence of human chorionic gonadotropin (HCG), a hormone produced after implantation of a fertilized egg in early pregnancy.

Quick summary

["A positive result suggests possible pregnancy; a negative result means pregnancy is unlikely."]

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

Key facts at a glance

LOINC
90985-3
Short code
HEDIS 2019-20 Preg Test Excl
Synonyms
HEDIS 2019-20 Preg Test Excl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
98
Ref high
107
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82435
SNOMED
110743000
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 This Test Measures

HCG is produced by the placenta shortly after a fertilized egg attaches to the uterine lining. This test checks for HCG in your blood or urine to determine if pregnancy has occurred.

When to Expect Results

Results are typically available within 24–48 hours after your sample is collected. Your healthcare provider will discuss timing with you based on your symptoms and test type.

How the Test Works

The test uses immunoassay (a lab method that detects specific proteins) to identify HCG in your blood or urine. Blood tests are more sensitive and can detect pregnancy earlier than urine tests.

Common Reasons for Testing

Doctors may recommend this test if you have missed menstrual periods, experience early pregnancy symptoms, or are at risk for pregnancy complications.

Reference range

Adult: 98-107 mmol/LN/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.

◆Associated findings1

Short name

HCG Pregnancy Test

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend this test to confirm pregnancy, monitor for ectopic pregnancy (HCG levels may be lower), or assess fertility issues. High levels can also indicate conditions like molar pregnancy or certain cancers.
What does a positive result mean?
A positive HCG test confirms pregnancy, but it does not confirm the health of the pregnancy. Follow-up tests or ultrasounds may be needed to assess fetal development.
Can false positives or negatives occur?
Yes, false positives (e.g., due to certain medications or conditions) or negatives (e.g., early pregnancy or lab errors) can happen. Your doctor will interpret results in the context of your medical history and symptoms.
  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