Infectious Disease Testing
Infectious Disease Testing can be requested without a referral, and this overview covers what to expect. Infectious disease testing uses a blood sample to look for signs that your body is fighting an infection or has been exposed to one. It may be ordered when you have symptoms, after possible exposure, or as part of routine screening.
- Sample type
- blood
- Category
- General Wellness
- Turnaround
- 1-3 business days
- Price
- $109
- Referral
- Not required
Infectious disease testing uses a blood sample to look for signs that your body is fighting an infection or has been exposed to one. It may be ordered when you have symptoms, after possible exposure, or as part of routine screening.
What it measures
- Antibodies — Proteins your immune system makes in response to a specific germ.
- Antigens — Pieces of a germ itself, which can show up before antibodies form.
- Nucleic acid (PCR) — Genetic material from a germ, used to detect active infection.
- White blood cell count — A general marker that can rise or fall with infection.
- Inflammatory markers — Substances such as CRP that can increase when the body is inflamed.
Who it is for
A clinician may order this test if you have symptoms, had possible exposure, or need screening before a procedure or travel. It is also used to monitor certain ongoing conditions.
Preparation
Most infectious disease blood tests need no fasting. Tell the lab about any medications or recent illness, and follow any timing instructions your clinician gives.
Results and what they mean
Results are reported as positive, negative, or a numeric value, depending on the test. A clinician interprets them alongside your symptoms and history. This is general information, not medical advice; discuss your results with a qualified professional.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the infectious disease testing is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to fast?
Usually no. Unless your clinician says otherwise, eat and drink normally before this test.
How long until results?
Turnaround is typically 1 to 3 business days, though some tests may take longer.
Can a negative result mean I am clear?
Not always. Timing matters, because some tests only turn positive after a window period.
Is my result private?
Yes. Your results are confidential and shared with you and your care team.