Skip to content

Skin Problems & Treatments Health Center

Font Size
A
A
A

Lyme Disease: Role of Blood Tests Topics

Lyme Disease: Role of Blood Tests - Topic Overview

If you were exposed to ticks and you get an expanding, circular rash (erythema migrans), your doctor may treat you for Lyme disease without doing a blood test. Blood tests done in the first few weeks may not show Lyme disease even when you have the illness. This is because the body's immune system responds slowly to the bacteria that cause Lyme disease. Blood tests may not detect antibodies to the disease even though the infection may be present. So a negative test result at this stage does not rule out a diagnosis of Lyme disease.

Blood tests may be used if you have symptoms of later Lyme disease, such as problems involving the joints, heart, or nervous system. But commonly done blood tests can't tell the difference between an active infection and a past infection that was treated and cured. A polymerase chain reaction (PCR) test can tell whether you have an active Lyme disease infection, but it is not available in many places.

1

WebMD Medical Reference from Healthwise

Last Updated: August 21, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
Next Article:

Today on WebMD

chafing
Pictures and symptoms of the red, scaly rash.
woman with dyed dark hair
What it says about your health.
 
woman with cleaning products
Top causes of the itch that rashes.
atopic dermatitus
Identify and treat common skin problems.
 
itchy skin
Article
shingles rash on skin
Article
 
woman with skin tag
Quiz
Woman washing face
Video
 

Itching for Relief?

Get Help With the

Loading ...

Sending your email...

This feature is temporarily unavailable. Please try again later.

Thanks!

Now check your email account on your mobile phone to download your new app.

woman washing her hair in sink
Video
close up of womans bare neck
Tools
 
Feet
Slideshow
woman with face cream
Quiz