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Ehrlichia IgG Antibody, Serum

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

This test measures antibodies to Ehrlichia, a type of bacteria that can cause infections in humans, often linked to tick bites.

Quick summary

["Detects past or current exposure to Ehrlichia bacteria through your blood serum."]

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

Key facts at a glance

LOINC
13197-9
Short code
Ehrlichia IgM Ser Ql
Synonyms
Ehrlichia IgM Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 identifies antibodies (immunoglobulin G, or IgG) produced by your immune system in response to exposure to Ehrlichia. These antibodies indicate whether your body has encountered the bacteria at some point, which can help diagnose or assess past infection.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like fever, headache, muscle pain, or fatigue that could be consistent with an Ehrlichia infection, especially if you’ve had a tick bite or live in an area where Ehrlichia is common.

When Might You Get Results Back?

Results typically take a few days to a week, depending on lab processing times. Your provider will discuss the results with you during your follow-up visit.

What Are Common Symptoms?

Symptoms of Ehrlichia infection may include high fever, chills, headache, muscle aches, nausea, and fatigue. Some people may not have noticeable symptoms at first.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps confirm a suspected Ehrlichia infection by detecting antibodies in your blood. While it can indicate past exposure, it does not always confirm an active infection. Additional testing or clinical correlation may be needed for diagnosis.

Short name

Ehrlichia Antibody Test

Frequently asked questions

Can this test be used to diagnose an active infection?
No, this test alone cannot diagnose an active Ehrlichia infection. It only shows if your body has produced antibodies against the bacteria, which may mean past exposure or immunity. Active infection is usually diagnosed through other tests or clinical symptoms.
What should I do if I suspect I’ve been exposed to Ehrlichia?
If you suspect exposure (e.g., from a tick bite) and develop symptoms like fever or fatigue, see a healthcare provider promptly. They may recommend additional tests, including blood cultures or PCR testing, to confirm an infection.
Are there any risks or side effects from this test?
No significant risks or side effects are associated with this blood test. A small needle prick may cause minor discomfort, but this is brief and common with blood draws.
  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