How to Read Your Blood Test
How to Read Your Blood Test Report Yourself — A Pakistani Medical Student Explains
You get your blood test report. Numbers everywhere. Abbreviations nobody explained to you. A reference range you don't understand. And a doctor's appointment three days away. This post is for that moment.
As a final-year MBBS student in Pakistan, I want to walk you through the most common blood tests — CBC, LFTs, RFTs, thyroid, and blood sugar — in simple, plain words. With Pakistani lab reference ranges included.
Important before we begin: This guide helps you understand your report — not diagnose yourself. Always discuss abnormal results with your doctor. But understanding what you are looking at helps you ask better questions and take your health more seriously.
Step 1 — How to Read Any Blood Report
Every blood test report — whether from Chughtai Lab, Agha Khan, or any local lab — follows the same basic structure. Here is what to look for:
Test Name — what was measured. Example: Haemoglobin, TSH, Creatinine.
Your Result — the actual number with its unit. Example: 11.2 g/dL or 4.5 mIU/mL. Units matter — different labs may use different units for the same test.
Reference Range — the normal range for that test. Always compare your result to the reference range printed on YOUR report — not numbers you find online, as ranges vary between labs.
Flag — most Pakistani labs mark abnormal results. Look for these:
High — your result is above the normal range
Low — your result is below the normal range
Asterisk or bold — abnormal result requiring attention
Do not panic if you see an H or L flag. Context matters enormously. A single slightly abnormal value rarely means serious disease. Your doctor looks at the whole picture — your symptoms, history, and all values together.
CBC — Complete Blood Count
The CBC is the most commonly ordered blood test in Pakistan. It measures the cells in your blood and gives a picture of your overall health, immune system, and whether you have anaemia.
| Test | Normal Range (Women) | What It Means |
|---|---|---|
| Haemoglobin (Hb) | 12.0 – 15.5 g/dL | Low = anaemia. High = dehydration or lung disease |
| RBC Count | 3.8 – 5.2 million/µL | Low = anaemia or blood loss. High = dehydration |
| Haematocrit (HCT/PCV) | 36 – 46% | Percentage of blood that is red cells. Low = anaemia |
| MCV | 80 – 100 fL | Size of red cells. Low = iron deficiency. High = B12/folate deficiency |
| WBC Count | 4,000 – 11,000/µL | High = infection or inflammation. Low = viral illness or immune issue |
| Platelets | 150,000 – 400,000/µL | Low = bleeding risk. High = inflammation or iron deficiency |
What High WBC Usually Means in Pakistan
In Pakistani patients, a raised WBC most commonly indicates a bacterial infection, typhoid, or UTI. Your doctor will look at which type of white cell is raised — neutrophils suggest bacterial infection, lymphocytes suggest viral infection.
What Low Haemoglobin Means
Low Hb confirms anaemia. But anaemia has many causes — iron deficiency, B12 deficiency, thalassaemia, or chronic disease. The MCV value tells you which type. Low MCV + low Hb = most likely iron deficiency anaemia in Pakistani women.
LFTs — Liver Function Tests
LFTs assess how well your liver is working. The liver is responsible for hundreds of functions — protein production, detoxification, and digestion. Abnormal LFTs can indicate fatty liver, hepatitis, medication side effects, or other liver conditions.
| Test | Normal Range | What It Means |
|---|---|---|
| ALT (SGPT) | 7 – 56 U/L | Most specific liver enzyme. High = liver cell damage — fatty liver, hepatitis |
| AST (SGOT) | 10 – 40 U/L | High = liver or muscle damage. Less specific than ALT |
| ALP | 44 – 147 U/L | High = bile duct blockage, bone disease, or liver disease |
| Bilirubin (Total) | 0.2 – 1.2 mg/dL | High = jaundice. Can indicate liver disease or blood cell breakdown |
| Albumin | 3.5 – 5.0 g/dL | Low = chronic liver disease, malnutrition, or kidney disease |
| Total Protein | 6.3 – 8.2 g/dL | Low = malnutrition or liver/kidney disease |
Most important LFT value in Pakistan — ALT (SGPT). Fatty liver disease is extremely common in Pakistan due to diet and obesity. A raised ALT — even mildly — in an otherwise healthy person is the earliest warning sign. Do not ignore a raised ALT even if you have no symptoms.
RFTs — Renal Function Tests
RFTs check how well your kidneys are filtering waste from the blood. Kidney disease is often completely silent until significant damage has occurred — making RFTs an important screening tool, especially if you have diabetes or high blood pressure.
| Test | Normal Range | What It Means |
|---|---|---|
| Creatinine | 0.5 – 1.1 mg/dL (women) | High = kidneys not filtering well. Most important kidney marker |
| Blood Urea (BUN) | 7 – 20 mg/dL | High = kidney disease or dehydration. Low = liver disease or malnutrition |
| Uric Acid | 2.4 – 6.0 mg/dL (women) | High = gout risk, kidney stones, or kidney dysfunction |
| Sodium | 135 – 145 mEq/L | Low = excess water or salt loss. High = dehydration |
| Potassium | 3.5 – 5.0 mEq/L | Low = vomiting, diarrhoea, diuretics. High = kidney failure |
| eGFR | Above 60 mL/min | Estimates kidney filtering capacity. Below 60 = reduced kidney function |
Creatinine is the single most important RFT value. A creatinine above normal in a Pakistani woman almost always warrants further investigation — especially if she has diabetes, hypertension, or a family history of kidney disease.
Thyroid Function Tests
Thyroid disorders are extremely common in Pakistani women — yet frequently missed or misattributed to stress or anxiety. A simple TSH test can identify both underactive and overactive thyroid.
| Test | Normal Range | What It Means |
|---|---|---|
| TSH | 0.4 – 4.0 mIU/L | High = underactive thyroid (hypothyroidism). Low = overactive (hyperthyroidism) |
| Free T4 | 0.8 – 1.8 ng/dL | Low with high TSH = confirms hypothyroidism |
| Free T3 | 2.3 – 4.2 pg/mL | Active thyroid hormone. Low = hypothyroidism or conversion problem |
TSH is the first test to order. TSH above 4.0 with symptoms of fatigue, weight gain, hair loss, and feeling cold = hypothyroidism until proven otherwise. This is one of the most commonly missed diagnoses in Pakistani women. If your TSH is borderline high — request a repeat test and Free T4.
Blood Sugar Tests
Pakistan has one of the highest rates of diabetes in the world — over 26% of adults are affected. Blood sugar testing is critical for every Pakistani adult.
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