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LabRequirements Know what your test requires

Knowledge base

Testing guides

Plain-language background on what different groups of tests measure, how samples are collected, and what results generally mean.

allergy

Allergy testing

IgE and related tests for food, environmental, and other allergens.

allergy Drug Allergy Testing: Penicillin and Other Reactions Drug allergy testing uses skin and blood tests to check reactions to penicillin and other medicines. Learn how it works and what the results mean. Read the guide allergy Dust Mite Allergy Testing: Symptoms, Panels and Results Learn how dust mite allergy testing works, which mite panels measure sensitivity, and what your IgE results mean for managing symptoms at home. Read the guide allergy Environmental Allergy Testing: Indoor and Outdoor Triggers Learn how environmental allergy testing finds indoor and outdoor triggers like dust, mold, pollen, and pet dander, and what your results mean. Read the guide allergy Food Allergy IgE Blood Testing: How It Really Works Food allergy IgE blood tests measure antibodies linked to allergic reactions. Learn how they work, what the results show, and their important limits. Read the guide allergy Insect Sting Allergy Testing: Bees, Wasps, and Ants Insect sting allergy testing uses venom panels to identify which insect caused a reaction. Learn how skin and blood tests work and what results mean. Read the guide allergy Milk and Egg Allergy Testing: A Parent and Adult Guide Learn how milk and egg allergy testing works, which proteins are measured, and what IgE results can tell you about cow milk and egg reactions. Read the guide allergy Mold Allergy Testing: Symptoms, Panels, and Results Mold allergy testing checks common indoor and outdoor mold species. Understand symptoms, panel options, and how to read your results. Read the guide allergy Nut Allergy Testing: Peanut, Almond, and Cashew Panels Understand peanut and tree nut allergy testing, which proteins panels detect, and how to read IgE results before talking with your doctor. Read the guide allergy Pet Dander Allergy Testing for Cats, Dogs, and More Pet dander allergy testing reveals sensitivity to cats, dogs, and other animals. Learn how the test works and what positive results mean. Read the guide allergy Seasonal Allergy Testing: Pollen, Grass, and Weed Triggers Seasonal allergy testing maps your reactions to tree, grass, and weed pollen so you can plan ahead and manage symptoms through every season. Read the guide allergy Shellfish and Fish Allergy Testing: What to Expect A clear look at shellfish and fish allergy testing, including shrimp, crab, clam, and finned fish panels, plus what a positive result can mean. Read the guide

autoimmune

Autoimmune testing

Antibodies and inflammation markers associated with autoimmune conditions.

autoimmune ANA Testing and Autoimmune Screening: A Plain Guide ANA testing screens for autoimmune activity in the blood. This guide explains what a positive or negative result means and which follow up tests may b… Read the guide autoimmune CRP Blood Test Guide: C-Reactive Protein Explained Learn what a CRP blood test measures, why clinicians order C-reactive protein testing, how the sample is collected, and how results are usually report… Read the guide autoimmune Celiac Disease Testing: Blood Tests and What Follows Celiac disease testing usually starts with antibody blood tests. Learn what they measure, why gluten matters, and how results are confirmed. Read the guide

cardiac

Cardiac testing

Markers associated with heart muscle and cardiovascular risk.

cardiac ApoB and Lp(a) Testing: Advanced Heart Risk Markers ApoB and Lp(a) testing adds detail beyond a standard cholesterol panel. Learn what these heart risk markers measure and when they are useful. Read the guide cardiac Homocysteine Testing: Cardiovascular Risk Explained Homocysteine testing measures an amino acid linked to B vitamin status and cardiovascular risk. Learn what the test shows and when it is useful. Read the guide cardiac Lipid Panel and Cholesterol Test: What the Numbers Mean A lipid panel measures cholesterol and triglycerides. Learn what each fraction means, when testing is useful, and how results are typically reported. Read the guide cardiac Troponin Blood Test: Detecting Heart Muscle Injury Troponin is a protein released when heart muscle is injured. Learn how troponin testing works, what high and normal levels mean, and when it is ordere… Read the guide

general

General wellness testing

Everyday panels and single markers for routine health checks.

general Complete Blood Count CBC Test: What Your Results Mean A complete blood count measures red cells, white cells, hemoglobin, and platelets. Learn what each marker means and why clinicians order this test. Read the guide general Full Wellness Blood Panels: What They Include and Why A full wellness blood panel bundles common lab tests into one order. See which tests are included, how to prepare, and what the results mean. Read the guide general Heavy Metal Testing: Lead, Mercury, Arsenic, and More Heavy metal testing checks levels of lead, mercury, and arsenic in blood or urine. Learn the sources of exposure, how tests work, and what results can… Read the guide general Urinalysis Guide: What Your Urine Test Results Mean A clear guide to urinalysis: what the test checks, how to collect a clean sample, dipstick and microscopic findings, and how results are usually repor… Read the guide

hepatitis

Hepatitis testing

Hepatitis A, B, and C screening and monitoring tests.

hepatitis Hepatitis A Testing: Immunity, Infection, and Results Learn how hepatitis A antibody tests show current infection, past exposure, and vaccine immunity, and what IgM and IgG results mean for you. Read the guide hepatitis Hepatitis B Testing Guide: Markers and Immunity Explained Hepatitis B testing explained: surface antigen, antibodies, and core markers, why clinicians order them, sample collection, and how results are report… Read the guide hepatitis Hepatitis C Testing Guide: Antibody, RNA, and Results Hepatitis C testing explained: antibody and RNA tests, who should be screened, window periods, confidentiality, and how results are interpreted. Read the guide

hormone

Hormone testing

Thyroid, sex, adrenal, and related endocrine markers.

hormone AMH Testing and Ovarian Reserve: A Plain-Language Guide AMH reflects the number of small follicles in the ovaries. Learn how the test is used, what high and low values suggest, and its limits for fertility. Read the guide hormone Cortisol Testing: Assessing Adrenal Gland Function Cortisol testing checks adrenal hormone levels through blood, saliva, or urine. Learn why it is ordered, how to prepare, and how results are read. Read the guide hormone DHEA-S Testing: What the Adrenal Hormone Really Shows DHEA sulfate testing measures an adrenal hormone that changes with age. Learn why it is ordered, how results are read, and what can affect the level. Read the guide hormone Estradiol Blood Test: Estrogen Levels and What They Mean Estradiol testing explained: what the hormone does, why levels are checked, sample collection, related hormones, and how results are typically reporte… Read the guide hormone FSH and LH Testing: Understanding Reproductive Hormones FSH and LH testing checks the pituitary signals that drive fertility. Learn why they are ordered, when to test, and how results are interpreted. Read the guide hormone Progesterone Testing: Timing, Levels, and Their Meaning Progesterone testing helps confirm ovulation and assess the menstrual cycle. Learn when to test, how results are read, and what can affect the level. Read the guide hormone Prolactin Testing: What Your High and Low Levels Mean Prolactin testing measures a pituitary hormone that affects fertility and milk production. Learn why it is ordered and how results are interpreted. Read the guide hormone TSH Test for Thyroid Function: What Your Level Means The TSH test measures the pituitary hormone that tells your thyroid to work. Learn how it helps check for an underactive or overactive thyroid gland. Read the guide hormone Testosterone Test Guide: Total, Free, and Low Levels Learn how testosterone testing works, the difference between total and free testosterone, sample timing, preparation, and how results are usually repo… Read the guide hormone Thyroid Antibody Testing: TPO, Thyroglobulin, and TSI Thyroid antibody testing checks for autoimmune thyroid disease. Learn what TPO, thyroglobulin, and TSI results mean and how they fit with hormone test… Read the guide

infectious

Infectious disease testing

Tests for common bacterial and viral infections.

infectious H. Pylori Testing: How to Detect the Ulcer Bacterium Learn what H. pylori testing involves, which sample types are used, how to prepare, and what positive and negative results mean for your care. Read the guide infectious Immunity Titer Testing: MMR, Varicella, Tetanus, and More Immunity titer testing checks antibody levels for measles, mumps, rubella, varicella, tetanus, and more to confirm protection. Read the guide infectious Lyme Disease Testing: How Antibody Blood Tests Work Lyme disease testing explained: how two-step antibody blood tests work, when to test, and what IgG and IgM results mean. Read the guide infectious Mononucleosis and EBV Testing: What Your Results Mean Mononucleosis and EBV testing explained: how antibody and blood count tests confirm mono, and what positive results mean. Read the guide

metabolic

Metabolic testing

Glucose, lipid, kidney, liver, and general chemistry panels.

metabolic Comprehensive Metabolic Panel Guide: Fourteen Markers A comprehensive metabolic panel checks kidney, liver, electrolyte, and glucose markers. Learn what each measure means and how the panel is reported. Read the guide metabolic Electrolyte Blood Testing: Sodium, Potassium, and More An electrolyte panel measures sodium, potassium, chloride, and bicarbonate. Learn what these minerals do and how results are used to assess fluid bala… Read the guide metabolic Fasting Insulin Test and Insulin Resistance Explained A fasting insulin test measures the hormone that moves sugar into cells. Learn how it is used to assess insulin resistance and support metabolic care. Read the guide metabolic GGT Testing Explained: A Liver and Bile Duct Enzyme GGT is a liver and bile duct enzyme measured in blood. Learn why GGT testing is ordered, how it fits with other liver tests, and what results can mean… Read the guide metabolic Hemoglobin A1c Test: Reading Your Average Blood Sugar The hemoglobin A1c test reflects average blood sugar over about three months. Learn how it is used to screen for and monitor diabetes and prediabetes. Read the guide metabolic Kidney Function Test Guide: BUN, Creatinine, eGFR Explained Kidney function testing explained: BUN, creatinine, eGFR, and urine albumin, why clinicians order them, sample collection, and how results are reporte… Read the guide metabolic Liver Function Test Guide: ALT, AST, and What Results Mean Liver function testing explained: ALT, AST, bilirubin, and other markers, why panels are ordered, sample collection, and how results are usually repor… Read the guide metabolic Uric Acid Testing and Gout: What Your Results Mean Uric acid is a waste product linked to gout and kidney stones. Learn how uric acid testing works, what high and low levels mean, and when it is ordere… Read the guide

std

Sexual health testing

Confidential testing for common sexually transmitted infections.

std Chlamydia and Gonorrhea Testing: A Complete Overview Chlamydia and gonorrhea are common bacterial infections. Learn how testing works, when it is recommended, and what positive and negative results mean. Read the guide std Genital Herpes HSV Testing: Types 1 and 2 Explained Herpes HSV testing can identify type 1 and type 2 infections. Learn how blood and swab tests work, when testing is useful, and what results show. Read the guide std HIV Testing Guide: Window Period, Types, and Results A calm, factual guide to HIV testing: test types, the window period, sample collection, confidentiality, confirmatory testing, and how results work. Read the guide std STD Testing Guide: Types, Timing, and What Results Mean Understand STD testing options, how samples are collected, window periods, confidentiality, and how results are reported. Plain, factual guidance. Read the guide std Syphilis Testing Guide: Screening, Types, and Timing Syphilis testing uses a sequence of blood tests to detect the infection. Learn about screening, confirmatory tests, timing, and how results are interp… Read the guide

vitamin

Vitamin & mineral testing

Nutrient markers such as vitamin D, B12, and iron.

vitamin B Vitamin Testing Guide: B1, B2, B3, B5, and B6 Levels B vitamin testing covers thiamin, riboflavin, niacin, pantothenic acid, B6, and B12. Learn what each marker does and when testing is useful. Read the guide vitamin Calcium Testing: Blood and Urine Calcium Explained Calcium testing measures the mineral in blood and urine. Learn why it is ordered, how samples are collected, and what abnormal results may indicate. Read the guide vitamin Ferritin and Iron Tests: Understanding Anemia Testing Ferritin and iron tests show how much iron your body stores and uses. Learn what each marker means and how anemia and iron deficiency are evaluated. Read the guide vitamin Folate and Folic Acid Testing: What Low Levels Mean Folate and folic acid testing measures a B vitamin vital for cell growth. Learn what low levels mean and how testing relates to vitamin B12. Read the guide vitamin Magnesium Testing Guide: Blood, RBC, and Urine Tests Magnesium tests check a mineral involved in muscle, nerve, and heart function. Learn about blood, red cell, and urine options and what results show. Read the guide vitamin Vitamin B12 Blood Test: Signs You May Need Testing A vitamin B12 test checks the level of this essential vitamin. Learn who may need testing, how the sample is taken, and how results are reported. Read the guide vitamin Vitamin D Blood Test: Checking Your Level Correctly A vitamin D test measures the main circulating form of the vitamin. Learn when testing is useful, who may need it, and how results are typically repor… Read the guide vitamin Zinc Testing: Detecting Deficiency and Excess Levels Zinc testing can reveal a deficiency or an excess of this essential mineral. Learn who may need testing, how samples are taken, and how results are re… Read the guide