Skip to content

Fetal Placental Growth Hormone (Human Chorionic Gonadotropin, HCG) in Serum/Plasma

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

This test measures the amount of human chorionic gonadotropin (HCG), a hormone produced by the placenta during pregnancy. It helps monitor fetal development and detect potential pregnancy complications.

Quick summary

["HCG levels are critical for early pregnancy assessment and monitoring."]

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

Key facts at a glance

LOINC
18851-6
Short code
Fet Placenta Grade - NAR US
Synonyms
Fet Placenta Grade - NAR US
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us
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 Is Done

Doctors may order an HCG test to confirm pregnancy, check for multiple pregnancies (like twins), or evaluate conditions such as ectopic pregnancy, miscarriage, or gestational trophoblastic disease. It’s also used during early pregnancy to monitor fetal growth and health.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. If you’re pregnant, your doctor may schedule this test early in your pregnancy, often within the first few weeks.

What the Test Results Mean

HCG levels rise steadily during early pregnancy, typically doubling every 48–72 hours. Abnormal patterns (e.g., very low or rapidly declining levels) may signal issues like a failed pregnancy or ectopic pregnancy. Your doctor will interpret results in the context of your medical history and symptoms.

Common Reasons for Abnormal Results

Low or absent HCG levels may indicate a missed miscarriage, ectopic pregnancy, or early pregnancy loss. Very high levels could suggest molar pregnancy or other rare conditions. Always discuss results with your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HCG Level

Frequently asked questions

When will I hear back about my results?
Results are typically available within 1–3 business days. Your doctor will explain the findings and next steps during your follow-up visit.
Can I eat or drink before this test?
No fasting is required for this blood test. However, follow any general instructions your doctor provides for your specific situation.
Is this test safe during pregnancy?
Yes, HCG testing is considered safe during pregnancy. The procedure involves a simple blood draw, and the hormone itself is naturally produced by your body.
  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