LabInformationLab tests, explained

Infectious Disease Testing in California

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. Across California, part of Pacific, the infectious disease testing can be ordered directly and collected at a certified site — no referral required.

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.

Requesting the Infectious Disease Testing in California

Order online, choose a certified collection site in California, and review results through a secure portal. No referral is required, and orders are processed confidentially. Because the region is uneven, coastal metros, inland towns, and rural counties with very different access to testing — worth planning around when you book.

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.

Infectious Disease Testing by city in California

All testing in California →   Full Infectious Disease Testing guide →