How to Read Blood Test Results
Your pathology report does not have to be confusing. This guide breaks down every section, explains common abbreviations, and helps you understand what your numbers actually mean.
Anatomy of a Pathology Report
Every blood test report follows a standard structure, whether it comes from Laverty, QML, Melbourne Pathology, or any other Australian laboratory. Understanding this structure is the first step to reading your results with confidence.
Patient Details
Your name, date of birth, Medicare number, and the requesting doctor. Always check these are correct - mix-ups are rare but do happen.
Collection Date and Time
When your blood was drawn. This matters because some markers (cortisol, iron) fluctuate throughout the day. The time also confirms whether you were fasting.
Test Panels Ordered
The groups of tests your doctor requested, such as "Full Blood Count", "Liver Function Tests", or "Lipid Profile". Each panel contains multiple individual markers.
Results Table
The main body of the report. Each row shows: the marker name (often abbreviated), your result value, the unit of measurement, and the reference range.
Flags (H / L)
Results outside the reference range are flagged with H (high) or L (low). Some labs use * or bold text instead. These flags are the first thing most people look for.
Lab Comments
Pathologists sometimes add interpretive comments at the bottom, especially for unusual results. These are valuable - do not skip them.
Reports from different labs look different, but the information is always the same. Some labs use colour coding (red for abnormal), while others use simple H/L flags. The key is finding the results table and the reference range column.
Understanding Reference Ranges
The reference range (sometimes called the “normal range”) is printed next to each result. It tells you the range of values that 95% of healthy people in the local population fall within. But there is more nuance than just “in range = good, out of range = bad.”
Key things to know about reference ranges:
- They vary between labs. Different laboratories use different equipment and methods, so the same test can have a slightly different reference range at different labs. Always compare your result against the range printed on your report, not one you found online.
- Age and sex matter. Haemoglobin ranges are higher for men than women. Alkaline phosphatase (ALP) is naturally higher in children and adolescents. Some labs print age-specific ranges; others use a single adult range.
- “Normal” does not always mean optimal. A ferritin of 15 is technically within range at many labs, but many doctors consider it too low for women of childbearing age. Similarly, a fasting glucose of 5.9 mmol/L is within range but in the “pre-diabetes” territory.
- 5% of healthy people fall outside the range. By statistical definition, 1 in 20 healthy people will have a result flagged as abnormal. If you test 20 markers, you are almost guaranteed at least one flag even if nothing is wrong.
- Trends matter more than single values. A cholesterol that has risen from 4.5 to 5.8 over three years is more meaningful than a single reading of 5.8, even if both readings are within the range.
Blood Test Abbreviations Dictionary
Pathology reports are full of abbreviations that can be bewildering. Here is a comprehensive reference for the most common ones, organised by test category. Bookmark this page for next time you get results.
Full Blood Count (FBC)
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| FBC / CBC | Full Blood Count / Complete Blood Count | Overall blood cell health |
| Hb / HGB | Haemoglobin | Oxygen-carrying protein in red cells |
| WBC / WCC | White Blood Cell Count | Immune system cells |
| RBC / RCC | Red Blood Cell Count | Oxygen-carrying cells |
| MCV | Mean Corpuscular Volume | Average red cell size |
| MCH | Mean Corpuscular Haemoglobin | Average haemoglobin per red cell |
| MCHC | Mean Corpuscular Haemoglobin Concentration | Haemoglobin concentration in red cells |
| RDW | Red Cell Distribution Width | Variation in red cell sizes |
| PLT / Plt | Platelet Count | Blood clotting cells |
| Hct / HCT / PCV | Haematocrit / Packed Cell Volume | Percentage of blood that is red cells |
| MPV | Mean Platelet Volume | Average platelet size |
| Neut | Neutrophils | Bacterial infection fighters |
| Lymph | Lymphocytes | Viral infection and immune cells |
| Mono | Monocytes | Chronic infection and tissue repair |
| Eos | Eosinophils | Allergy and parasite response |
| Baso | Basophils | Allergic and inflammatory response |
Metabolic / Electrolytes
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| Na | Sodium | Fluid balance and nerve function |
| K | Potassium | Heart rhythm and muscle function |
| Cl | Chloride | Acid-base balance |
| CO2 / HCO3 | Bicarbonate | Acid-base balance (blood pH) |
| Urea / BUN | Blood Urea Nitrogen | Kidney waste clearance |
| Creat | Creatinine | Kidney filtration |
| eGFR | Estimated Glomerular Filtration Rate | Overall kidney function score |
| Ca | Calcium | Bone health, nerve and muscle function |
| Mg | Magnesium | Muscle, nerve and enzyme function |
| PO4 / Phos | Phosphate | Bone health and energy production |
| Urate / UA | Uric Acid | Gout risk and kidney function |
Liver Function Tests (LFTs)
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| ALT / SGPT | Alanine Aminotransferase | Liver cell damage (most specific) |
| AST / SGOT | Aspartate Aminotransferase | Liver (also heart/muscle) damage |
| GGT | Gamma-Glutamyl Transferase | Bile duct health, alcohol use |
| ALP | Alkaline Phosphatase | Bile duct and bone health |
| Bili | Bilirubin | Liver processing of old red cells |
| Alb | Albumin | Liver protein production |
| TP | Total Protein | Albumin + globulins combined |
Lipid Panel (Cholesterol)
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| TC | Total Cholesterol | All cholesterol types combined |
| LDL / LDL-C | Low-Density Lipoprotein | "Bad" cholesterol (artery-clogging) |
| HDL / HDL-C | High-Density Lipoprotein | "Good" cholesterol (artery-clearing) |
| TG / Trig | Triglycerides | Blood fats from food and liver |
| TC:HDL | Total Cholesterol to HDL Ratio | Cardiovascular risk ratio |
| Non-HDL | Non-HDL Cholesterol | All atherogenic cholesterol (TC minus HDL) |
Thyroid Function
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| TSH | Thyroid Stimulating Hormone | Pituitary signal to thyroid |
| FT4 / Free T4 | Free Thyroxine | Active thyroid hormone (main output) |
| FT3 / Free T3 | Free Triiodothyronine | Most active thyroid hormone |
| Anti-TPO | Anti-Thyroid Peroxidase Antibodies | Autoimmune thyroid disease marker |
| Anti-Tg | Anti-Thyroglobulin Antibodies | Autoimmune thyroid marker |
Iron Studies
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| Ferritin | Ferritin | Iron storage levels |
| Fe / Serum Iron | Serum Iron | Circulating iron in blood |
| TIBC | Total Iron Binding Capacity | Transferrin available to carry iron |
| Tsat / Trans Sat | Transferrin Saturation | Percentage of transferrin carrying iron |
Diabetes / Glucose
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| FBG / FPG | Fasting Blood Glucose / Fasting Plasma Glucose | Current blood sugar level (fasting) |
| HbA1c / A1C | Glycated Haemoglobin | 3-month average blood sugar |
| OGTT | Oral Glucose Tolerance Test | How body handles sugar load |
Inflammation
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| CRP / hsCRP | C-Reactive Protein (high sensitivity) | Acute inflammation marker |
| ESR | Erythrocyte Sedimentation Rate | Chronic inflammation indicator |
Vitamins
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| Vit D / 25-OH | 25-Hydroxyvitamin D | Vitamin D storage level |
| B12 | Vitamin B12 (Cobalamin) | Nerve function and red cell production |
| Folate / B9 | Folate (Folic Acid) | Cell division and red cell production |
Hormones
| Abbreviation | Full Name | What It Measures |
|---|---|---|
| Testosterone | Testosterone | Male/female sex hormone |
| E2 / Estradiol | Oestradiol (Estradiol) | Primary female sex hormone |
| FSH | Follicle Stimulating Hormone | Reproductive hormone (fertility) |
| LH | Luteinising Hormone | Reproductive hormone (ovulation/testosterone) |
| DHEA-S | Dehydroepiandrosterone Sulfate | Adrenal gland hormone |
| Cortisol | Cortisol | Stress hormone (adrenal) |
| PSA | Prostate-Specific Antigen | Prostate health marker (males) |
Reading Multi-Date Reports and Spotting Trends
Some pathology reports show results from multiple dates side by side, and your doctor may review several reports together. Trends over time are far more informative than any single snapshot.
Worsening trends to watch for: A marker that was comfortably mid-range but has been steadily creeping toward the upper or lower limit over the past 2-3 tests. For example, a fasting glucose that went from 4.8 to 5.2 to 5.6 mmol/L is technically still within range, but the trajectory tells a story of developing insulin resistance.
Improving trends to celebrate: After treatment or lifestyle changes, watching your markers return toward optimal levels is rewarding and motivating. If your HbA1c has dropped from 6.2% to 5.8% to 5.5%, your diabetes management is clearly working.
Fluctuations vs real changes: Small fluctuations between tests are normal. A cholesterol that goes from 5.2 to 5.4 and back to 5.1 is just normal biological variation. A change is only meaningful if it is consistent across multiple tests or large enough to be outside the expected variation for that marker.
Common Marker Combination Patterns
Individual markers tell part of the story. When certain markers are abnormal together, they form recognisable patterns that point toward specific conditions. Here are the most common combinations doctors look for.
Iron Deficiency Anaemia
The pattern: Your iron stores are depleted, red cells are small (microcytic), and haemoglobin is low.
What happens next: Iron supplementation is usually the first step. Your doctor will investigate the cause (dietary, blood loss, or malabsorption).
Underactive Thyroid (Hypothyroidism)
The pattern: Your pituitary is shouting at your thyroid (high TSH) but the thyroid is not responding (low Free T4).
What happens next: Thyroid hormone replacement (levothyroxine) is typically prescribed. Anti-TPO antibodies may be tested to check for Hashimoto's thyroiditis.
Metabolic Syndrome Pattern
The pattern: High triglycerides, low "good" cholesterol, and elevated fasting glucose together suggest insulin resistance.
What happens next: Lifestyle changes (diet, exercise) are first-line treatment. Your doctor may also check waist circumference and blood pressure to confirm the diagnosis.
Kidney Function Decline
The pattern: Creatinine and urea are waste products normally cleared by kidneys. When they rise and eGFR drops, your kidneys are not filtering efficiently.
What happens next: Repeat testing in 3 months to confirm. Chronic kidney disease is staged by eGFR level. Managing blood pressure and blood sugar is critical.
Liver Inflammation
The pattern: When all three liver enzymes are elevated, the liver cells are under stress or being damaged.
What happens next: Your doctor will consider alcohol use, fatty liver disease, medications, viral hepatitis, and other causes. An ultrasound is often the next step.
Megaloblastic Anaemia
The pattern: Red cells are abnormally large (macrocytic) because B12 or folate is needed for proper cell division during production.
What happens next: B12 injections or oral supplementation depending on the cause. Folate supplements if folate is the culprit. Dietary assessment is important.
Frequently Asked Questions
Blood test results naturally fluctuate due to biological variation. Your haemoglobin can vary by up to 10 g/L between tests, and cholesterol can shift by 10-15% day to day. Fasting status, time of day, hydration level, recent exercise, illness, stress, and medications all influence results. Mild fluctuations within or near the reference range are expected and usually clinically insignificant. What matters more is the overall trend across multiple tests.
Reference ranges are set using statistical methods so that 95% of healthy people fall within them. This means 5% of perfectly healthy people will have a result outside the range by pure chance. A single mildly abnormal result is very common and often meaningless on its own. Your doctor considers the full clinical picture: your symptoms, history, other test results, and how far outside the range the value is. A value one unit above the range is very different from one that is ten units above.
It depends on what is being tested. Fasting for 10-12 hours (water is fine) is required for accurate fasting glucose and lipid panel (cholesterol/triglycerides) results. Eating before these tests can falsely elevate triglycerides by 20-30%. However, most other common tests - FBC, thyroid function, iron studies, kidney function, liver function, CRP, vitamins - do not require fasting. Your pathology request form will specify "fasting" if needed, and your doctor should mention it when ordering.
Yes, many medications significantly affect blood results. Statins can raise liver enzymes (ALT, AST) by 1-3 times the upper limit. Metformin can lower B12 levels over time. Diuretics affect electrolytes (sodium, potassium). Biotin supplements interfere with thyroid tests (TSH, FT4) and can cause false results. Corticosteroids raise blood glucose and white blood cells. Proton pump inhibitors (PPIs) can lower magnesium and B12. Always tell your doctor about all medications and supplements before blood tests.
In general, worry less about mildly abnormal isolated results and pay attention to these patterns instead: multiple related markers abnormal together (e.g., all liver enzymes elevated), results progressively worsening over consecutive tests, values significantly far outside the reference range (not just borderline), and results that match symptoms you are experiencing. If something needs urgent attention, your doctor or the lab will contact you directly - often within hours. Routine results are typically communicated within a week.
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