Blood Test Results: Plain-Language Guide for Canadians

Getting your blood test results back from your doctor can feel overwhelming, especially when the page is filled with numbers, abbreviations, and unfamiliar medical terms. Whether your family physician ordered routine blood work or you are following up on a specific concern, this guide breaks down the most common lab values in plain language so you can feel informed and confident at your next appointment.

How to Understand Your Blood Test Results in Canada

In Canada, understanding blood test results is an important part of managing your health. Provincial health plans cover most standard lab work, and your doctor uses these values to check how well your organs are functioning, screen for chronic conditions, and catch potential problems early. Below, we explain normal blood test values Canadian patients commonly see — from cholesterol and bilirubin to enzymes, hormones, and immune markers — so you know exactly what your numbers mean.

What Are Blood Test Results and Why Do They Matter?

Common Blood Test Results: What Your Numbers Mean

Blood Test	Normal Range (Canada)	What Abnormal Results May Indicate	Recommended Action
Hemoglobin	Men: 130–175 g/L | Women: 120–160 g/L	Low levels may suggest anemia or iron deficiency; high levels may indicate dehydration or a blood disorder	Follow up with your family doctor; may require iron studies or further testing
Fasting Blood Glucose	3.9–5.5 mmol/L	Levels between 5.6–6.9 mmol/L indicate prediabetes; 7.0 mmol/L or higher on two tests indicates diabetes	Lifestyle modifications and monitoring; physician may refer to a diabetes educator
Total Cholesterol	Less than 5.2 mmol/L (desirable)	Elevated levels increase risk of heart disease and stroke; low HDL raises cardiovascular risk	Dietary changes, increased physical activity; physician may consider statin therapy
TSH (Thyroid-Stimulating Hormone)	0.4–4.0 mIU/L	High TSH suggests hypothyroidism; low TSH may indicate hyperthyroidism or thyroid overactivity	Repeat testing and possible referral to an endocrinologist for management
eGFR (Kidney Function)	90 mL/min/1.73m² or higher	Levels below 60 for three or more months may indicate chronic kidney disease (CKD)	Nephrology referral recommended; blood pressure and diabetes management are key priorities

Blood tests measure substances in your blood and urine. These substances include enzymes, hormones, proteins, and fats. Your doctor uses these values to check how well your organs are working and to spot signs of disease early.

In Canada, your family doctor or a specialist will order these tests through your provincial health plan. Most routine blood work is covered. Results are usually sent to your doctor within a few days, and many provinces now let you view them online through patient portals.

Understanding Cholesterol Levels in Your Blood Test Results

Cholesterol is a fatty substance found in your blood. Your body needs some cholesterol to work properly. However, too much of the wrong type raises your risk of heart disease and stroke.

There are three main types your doctor will check. Understanding each one helps you see the full picture of your heart health.

HDL Cholesterol (The “Good” Kind)

HDL stands for high-density lipoprotein. Think of it as a cleanup crew. HDL carries cholesterol away from your artery walls and back to your liver, where your body can get rid of it.

Normal HDL values are between 0.35 and 0.80 g/L (or 32–96 mg/dL). Low HDL levels are linked to a higher risk of heart disease. Smoking, diabetes, and aging can all lower your HDL. In addition, certain birth control pills may reduce HDL levels.

As a general guide, a cholesterol ratio above 5 in men or above 4.5 in women suggests an increased risk of cardiovascular problems. Your doctor will look at your full cholesterol panel, not just one number. Health Canada provides updated guidance on heart health risk factors for Canadians.

LDL Cholesterol (The “Bad” Kind)

LDL stands for low-density lipoprotein. It carries about 50% cholesterol and deposits it in your artery walls. Over time, this buildup narrows your arteries and raises your risk of heart attack and stroke.

Normal LDL values are roughly 3.9–4.9 mmol/L (or 0–130 mg/dL). High LDL can run in families, a condition called familial hypercholesterolaemia. Therefore, if high cholesterol runs in your family, tell your doctor so they can screen you early.

VLDL Cholesterol

VLDL stands for very low-density lipoprotein. It carries triglycerides (another type of fat) through your bloodstream. High VLDL levels are also linked to artery disease. Your doctor usually calculates VLDL from your total triglyceride level rather than measuring it directly.

Bilirubin: What This Blood Test Result Tells You About Your Liver

Bilirubin is a yellow pigment. It forms when your body breaks down old red blood cells. Your liver then processes it and sends it into bile, which helps you digest food.

When bilirubin builds up in your blood, your skin and eyes can turn yellow. This is called jaundice. Doctors check two types of bilirubin in your blood test results.

Direct (Conjugated) Bilirubin

Direct bilirubin is processed by the liver. Normal levels are below 0.2% of total bilirubin. High direct bilirubin can point to a blockage in your bile ducts or liver disease such as hepatitis or cirrhosis. Levels above 150 mg/L are associated with visible jaundice.

Indirect (Free) Bilirubin

Indirect bilirubin has not yet been processed by the liver. Normal levels are roughly 3–6 mg/L. Elevated indirect bilirubin often signals that red blood cells are breaking down too quickly — a condition called haemolytic anaemia. It is also the cause of the normal yellowing seen in newborn babies (neonatal jaundice). Levels above 15 mg/L usually point to significant red blood cell breakdown.

Enzyme Levels Commonly Seen in Blood Test Results

Enzymes are proteins that drive chemical reactions in your body. When an organ is damaged, it leaks enzymes into your blood. Your doctor measures these enzymes to find out which organ may be affected.

ALT and AST (Liver and Heart Enzymes)

Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) are enzymes found mainly in the liver and heart muscle. Normal AST values are 14–50 IU/L. When these values rise sharply, it can indicate a heart attack or liver damage. For example, AST levels spike within hours of a heart attack. The Mayo Clinic explains how enzyme tests help diagnose heart and liver conditions.

Amylase (Pancreas and Salivary Glands)

Amylase is an enzyme that breaks down starch into sugar. Your salivary glands and pancreas both produce it. High amylase levels in your blood test results can point to acute pancreatitis, gallstones, a blocked bowel, or mumps. Your doctor will usually order a lipase test at the same time for a clearer picture of pancreatic health.

Creatine Phosphokinase (CPK)

CPK is a muscle enzyme. It is released into the blood when muscle tissue is damaged. Doctors use CPK levels to help diagnose heart attacks, muscle diseases, and injuries. High CPK after intense exercise is common and usually harmless.

Antibodies and Immune Markers in Lab Results

Some blood tests look at your immune system’s activity. These tests check for antibodies — proteins your body makes to fight infections or, sometimes, its own tissues.

ASO (Antistreptolysin O)

The ASO test measures antibodies against a toxin made by strep bacteria. A high ASO level means you have recently had a strep infection, such as strep throat. Furthermore, high ASO is closely linked to rheumatic fever, a serious complication that can damage the heart. Your doctor may order this test if you have joint pain or heart symptoms after a strep infection.

Lupus Cells and Serum Complement

Lupus cells are a type of white blood cell seen in people with lupus (systemic lupus erythematosus, or SLE). They appear in 80–90% of lupus cases. Serum complement levels drop in lupus, rheumatoid arthritis, and post-strep kidney disease. In contrast, complement levels rise during active infections and some cancers. These markers help doctors track how active an autoimmune disease is.

Hormones Measured in Blood Tests

Hormones are chemical messengers that control many body functions. Your blood test results may include hormone levels if your doctor suspects a gland problem.

ACTH (Corticotropin)

ACTH is made by the pituitary gland in your brain. It tells your adrenal glands (located above your kidneys) to release stress hormones like cortisol. Abnormal ACTH levels can point to conditions such as Cushing’s syndrome or Addison’s disease. Your doctor will interpret ACTH alongside cortisol results.

Vanillylmandelic Acid (VMA) — A Urine Test

VMA is measured in a 24-hour urine collection, not a standard blood draw. Normal levels are 1.7–7.4 mg per 24 hours. Levels above 10 mg/24h may suggest a neuroblastoma, a tumour most often seen in children. Levels between 26 and 66 mg/24h strongly suggest a phaeochromocytoma, a rare adrenal gland tumour that causes high blood pressure. The World Health Organization offers resources on rare endocrine conditions.

Blood Types and Agglutinins Explained

Your blood type is determined by proteins called antigens on the surface of your red blood cells. Agglutinins are antibodies in your blood plasma that react with foreign blood types.

The ABO system divides blood into four groups:

• Type A — has A antigens on red blood cells
• Type B — has B antigens on red blood cells
• Type AB — has both A and B antigens
• Type O — has neither A nor B antigens

Knowing your blood type matters most for blood transfusions and organ transplants. In Canada, Canadian Blood Services manages the national blood supply and type matching for all provinces and territories.

When to See a Doctor About Your Blood Test Results

You should never interpret your blood test results alone. Numbers that look unusual are not always a cause for alarm — your doctor looks at your full health history, symptoms, and other test results together.

If you receive results and feel worried, contact your family doctor first. If your regular doctor is unavailable, a walk-in clinic can review routine results. However, if you have chest pain, sudden jaundice, or severe symptoms, go to your nearest emergency department right away.

Many Canadians also have access to nurse practitioners and pharmacists who can help explain results and next steps. Ask your provincial health authority about telehealth lines available in your area — many provinces offer free 24-hour health advice by phone.

Always speak with a qualified healthcare provider before making any changes to your health based on lab results. This article is for general information only.

Frequently Asked Questions About Blood Test Results

Key Takeaways

• Blood test results measure enzymes, hormones, fats, and antibodies to check how your body is working.
• Cholesterol results include HDL (good), LDL (bad), and VLDL — each giving different clues about heart disease risk.
• Bilirubin levels help your doctor assess liver health and red blood cell breakdown.
• Enzyme levels such as ALT, AST, and amylase point to damage in the liver, heart, or pancreas.
• Antibody tests like ASO help detect past strep infections and their complications.
• Always discuss your results with your family doctor, a walk-in clinic provider, or a nurse practitioner before drawing conclusions.
• Most routine blood tests are covered by provincial health plans across Canada.