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Biomarker library

What we test, and why

Every marker we offer, grouped by body system. Open any marker for a summary, or go to its group page for the guideline behind it, the ranges, what can affect it and what we do if it's out of range. We count each result once and show calculated scores separately.

Medically reviewed by Anantha Chentha, MD, Co-Founder and Chief Quality Medical Officer · October 30, 2026. Meet our cliniciansNext review: October 2027

In Full Blood WorkFocused panel or single testCalculated
01

Heart & vascular

Cholesterol particles and inherited risk that guidelines use to decide on prevention.

GuidesApoB test guideLp(a) test guideBlood pressure chart and calculatorWarning signs of high cholesterol

7 markers · 6 in the Full Blood Work
Get these in

Apolipoprotein B (ApoB)

In Full Blood Work

Counts the particles that carry cholesterol into artery walls.

Read the full Apolipoprotein B guide

Lipoprotein(a)

In Full Blood Work

An inherited cholesterol particle; one test in adulthood is usually enough.

Read the full Lipoprotein(a) guide

LDL cholesterol

In Full Blood Work

The main cholesterol target for treatment.

HDL cholesterol

In Full Blood Work

Cholesterol carried away from the arteries.

Triglycerides

In Full Blood Work

Blood fats that rise with sugar, alcohol and weight.

Total cholesterol

In Full Blood Work

All cholesterol combined.

Non-HDL cholesterol

Calculated

Total cholesterol minus HDL: cholesterol in harmful particles.

02

Inflammation

Low-grade inflammation that adds to heart risk.

1 marker · 1 in the Full Blood Work
Get these in

High-sensitivity CRP

In Full Blood Work

Low-grade inflammation linked to heart disease.

03

Metabolic & diabetes

Blood sugar control and insulin resistance.

GuidesA1c calculator: average blood sugar to A1c

6 markers · 2 in the Full Blood Work
Get these in

Hemoglobin A1c

In Full Blood Work

Your average blood sugar over about three months.

Fasting glucose

In Full Blood Work

Blood sugar at the moment of the draw.

Estimated average glucose

Calculated

Your A1c translated into everyday glucose units.

Fasting insulin

Single test

How hard your body works to keep sugar normal.

HOMA-IR

Calculated

Insulin resistance score from fasting insulin and glucose.

Uric acid

Single test

A waste product linked to gout and kidney stones.

04

Kidney & electrolytes

How well your kidneys filter, and the salts they balance.

GuidesBUN test guideWhat is eGFR in a blood test?

11 markers · 7 in the Full Blood Work
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Creatinine

In Full Blood Work

A muscle waste product filtered by the kidneys.

eGFR

Calculated

Your estimated kidney filtering rate.

Blood urea nitrogen (BUN)

In Full Blood Work

Another kidney waste marker.

Read the full Blood urea nitrogen guide

Urine albumin

In Diabetes & Kidney Panel

Protein leaking into urine, an early sign of kidney strain.

Urine creatinine

In Diabetes & Kidney Panel

Used to correct urine albumin for how concentrated the urine is.

Albumin/creatinine ratio

Calculated

The standard urine test for early kidney damage.

Sodium

In Full Blood Work

The main salt in your blood.

Potassium

In Full Blood Work

Important for heart rhythm and muscles.

Chloride

In Full Blood Work

A salt that moves with sodium.

Carbon dioxide (bicarbonate)

In Full Blood Work

Reflects your blood's acid-base balance.

Calcium

In Full Blood Work

Important for bones, nerves and muscles.

05

Liver

Liver enzymes, proteins and the FIB-4 scarring score.

GuidesALT test guideAST test guideAlbumin test guide

7 markers · 6 in the Full Blood Work
Get these in

ALT

In Full Blood Work

Liver enzyme that rises with liver inflammation, including fatty liver.

Read the full ALT guide

AST

In Full Blood Work

Enzyme from the liver and muscles.

Read the full AST guide

Alkaline phosphatase

In Full Blood Work

Enzyme from the liver and bones.

Total bilirubin

In Full Blood Work

Breakdown product of red cells.

Albumin

In Full Blood Work

The main blood protein, made by the liver.

Read the full Albumin guide

Total protein

In Full Blood Work

All proteins in the blood.

FIB-4 score

Calculated

Liver scarring risk from your age, AST, ALT and platelets.

06

Blood & immune

Red cells, white cells and platelets.

GuidesRBC count guideHematocrit test guideMCV test guideMCH test guideMCHC test guideRDW test guide

14 markers · 14 in the Full Blood Work
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White blood cells

In Full Blood Work

Your infection-fighting cells.

Neutrophils

In Full Blood Work

The most common white cell; fights bacteria.

Lymphocytes

In Full Blood Work

White cells that fight viruses.

Monocytes

In Full Blood Work

White cells that clean up damaged tissue.

Eosinophils

In Full Blood Work

White cells involved in allergies and parasites.

Basophils

In Full Blood Work

Rare white cells involved in allergic reactions.

Red blood cells

In Full Blood Work

The cells that carry oxygen.

Read the full Red blood cells guide

Hemoglobin

In Full Blood Work

The oxygen-carrying protein in red cells.

Hematocrit

In Full Blood Work

The share of your blood made of red cells.

Read the full Hematocrit guide

MCV

In Full Blood Work

Average red cell size.

Read the full MCV guide

MCH

In Full Blood Work

Average hemoglobin per red cell.

Read the full MCH guide

MCHC

In Full Blood Work

Hemoglobin concentration in red cells.

Read the full MCHC guide

RDW

In Full Blood Work

How much red cell sizes vary.

Read the full RDW guide

Platelets

In Full Blood Work

Cells that help blood clot.

07

Thyroid

Thyroid function, tested when there's a reason.

2 markers
Get these in

TSH

In 3 focused panels

The main thyroid test.

Free T4

In Thyroid Panel

The main thyroid hormone in circulation.

08

Nutrients & iron

Iron stores and vitamins that affect energy, blood and bones.

GuidesFerritin test guide

7 markers
Get these in

Ferritin

In Energy & Iron Panel

Your body's iron stores.

Read the full Ferritin guide

Iron

In Energy & Iron Panel

Iron circulating in your blood.

Unsaturated iron-binding capacity

In Energy & Iron Panel

Spare room on iron-carrying proteins.

Transferrin saturation

Calculated

How much of your iron-carrying capacity is used.

Vitamin B12

In Energy & Iron Panel

Needed for red blood cells and nerves.

Folate

In Energy & Iron Panel

A B vitamin needed for red blood cells.

Vitamin D

Single test

25-hydroxy vitamin D, linked to bone health.

09

Sex hormones

Hormones for men's and women's health questions.

6 markers
Get these in

Testosterone, total

In Men's Health Panel

The main male sex hormone.

SHBG

In Men's Health Panel

Protein that carries testosterone and estrogen.

Free testosterone

Calculated

The active, unbound testosterone.

Estradiol

In Women's Midlife Panel

The main estrogen.

FSH

In Women's Midlife Panel

A pituitary hormone that rises around menopause.

PSA

In Men's Health Panel

A prostate protein used in prostate cancer screening.

10

Infection screening

One-time screening recommended for adults.

5 markers
Get these in

Hepatitis C antibody

In Infection Screening Panel

Shows past or current hepatitis C infection.

HIV antigen/antibody

In Infection Screening Panel

Screens for HIV infection.

Hepatitis B surface antigen

In Infection Screening Panel

Shows current hepatitis B infection.

Hepatitis B surface antibody

In Infection Screening Panel

Shows immunity from vaccination or past infection.

Hepatitis B core antibody

In Infection Screening Panel

Shows past or current infection.