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Immune & Infectious Disease Lab Tests

Immune and infectious disease lab tests measure antibodies, antigens, and immune-cell counts to show what your immune system has encountered and how it is currently responding. They are used to check immunity after vaccination, screen for common infections, and track markers of immune activation. This hub covers the key tests and what their results can and cannot tell you.

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Lab test panels

Arthritis Blood Test Panels: RF, Anti-CCP, ANA & Inflammation Markers

Blood panels that measure the inflammation and autoimmune markers most often reviewed when joint pain and stiffness show up.

Celiac Disease Blood Test: tTG-IgA, DGP & EMA Antibody Panels

Antibody and nutrient panels that screen for celiac-related immune activity and help you track progress on a gluten-free diet.

Hepatitis A & B Blood Tests: Immunity Titers & Infection Screening

Know your hepatitis A and B status, immunity, exposure, or active infection, from a single blood draw.

Hepatitis C Blood Test: Antibody, RNA Viral Load & Liver Panels

Antibody screening, RNA confirmation, and liver function markers in one place, with 20% promotional savings.

Immune System Blood Test Panel: Nutrients, Antibodies & Titers

A lab-based look at the nutrients, antibodies, and immune markers behind your body's defenses.

Titer Testing: Blood Tests to Verify Immunity & Vaccination Status

One blood draw measures the antibody levels behind your immunity to measles, mumps, rubella, hepatitis, varicella, tetanus, and more.

Inflammation Blood Test Panels: Track Key Inflammatory Markers

Three tiers of lab panels that measure the markers behind chronic, low-grade inflammation.

Long COVID Blood Tests: Post-COVID Panels for Lingering Symptoms

Eight post-COVID lab panels that measure inflammation, organ function, clotting, and immune markers associated with lingering symptoms.

Lyme Disease Blood Tests: Antibody (IgG/IgM) & DNA Panels

Antibody and DNA testing that screens for exposure to the tick-borne bacterium associated with Lyme disease.

Peptic Ulcer Testing: H. Pylori Breath Test & GI Panels

Screen for H. pylori, the bacterium most often associated with peptic ulcers, with a simple, noninvasive breath test.

STD Testing Panels: Private Lab Screening for HIV, Chlamydia & More

Confidential, lab-based STD screening you can order online, with most results back in 24–48 hours.

Tuberculosis (TB) Blood Test: QuantiFERON Gold Plus Screening

A single-visit, FDA-approved blood screening for immune markers associated with latent and active TB infection.

Rheumatoid Arthritis Blood Tests: RF, Anti-CCP & CRP Panels

Four tiers of RA panels that measure the autoimmune and inflammation markers doctors review most.

Gluten Intolerance Testing: Blood Tests for Gluten Sensitivity

Blood panels that screen for the celiac antibodies and nutrient gaps behind gluten-related symptoms.

Hepatitis Titer Tests: Verify Immunity for Work, School & Travel

Document your hepatitis A and B immunity with lab titers accepted for employment, school programs, and travel prep.

HCV Viral Load & Genotype Tests: RNA Monitoring Panels

Quantitative HCV RNA and genotype panels for tracking an active hepatitis C infection with your care team.

Antibody Titer Tests: MMR, Varicella & Hepatitis Immunity Labs

Lab-verified antibody levels for the records schools, employers, and clinical programs ask for.

Proof of Immunity: Titer Tests for Work, School & Travel

Documented antibody results that address employer, school, and travel immunization requirements, no vaccination records needed.

Blood Tests for Unexplained Fatigue, Joint Pain & Body Aches

When symptoms have no clear cause, inflammatory markers give you and your doctor somewhere to start.

Blood Tests for Post-COVID Fatigue, Brain Fog & Low Energy

Lab panels that measure the inflammation, immune, hormone, and nutrient markers most often reviewed when energy and focus don't rebound after COVID-19.

Tick Bite Blood Test: What to Order and When to Test

The blood tests to know about after a tick bite, and why timing changes what each one can show.

Chlamydia & Gonorrhea Urine Test: Private Lab Screening Online

A simple urine sample screens for the two most common bacterial STIs, no swab, no fasting, no doctor's appointment.

QuantiFERON TB Test for Work & School Requirements

A one-visit TB blood screening commonly requested for healthcare, school, and volunteer clearances.