How to Read Your Blood Test Report: A Complete Patient Guide for Pakistan

Your blood test report just arrived on the Chughtai or Aga Khan app and half the values have a red H or L next to them. Don't panic. This guide will walk you through every section of a Pakistani lab report — what each value means, what the flags actually indicate, and exactly when you need to act.

The Anatomy of a Pakistani Lab Report

Whether you receive your report from Chughtai Lab, IDC, Aga Khan, or Excel Lab, the structure is largely the same. Every lab report has four core sections:

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Patient Information

Your name, age, sex, date of collection, referring doctor, and specimen type (usually venous blood). Always verify this section first — a mislabelled sample is rare but not impossible.

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Test Name & Result

The name of each test, your actual measured value, and the unit (g/dL, U/L, mg/dL, etc.). This is the number your doctor will focus on.

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Reference Range

The normal range for each test based on your age and sex. This is specific to the lab — Chughtai and Aga Khan may show slightly different ranges for the same test.

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Flag Column

An H (High), L (Low), ★ or asterisk, or highlighted row. This is where most patients focus — but the flag is just a starting point, not a verdict.

⚠️ The Most Important Thing to Know Before Reading Any Result

A value outside the reference range does NOT automatically mean something is seriously wrong. Reference ranges are set to include 95% of healthy people — meaning 1 in 20 healthy people will have a "flagged" result for any given test by pure statistics. Context, symptoms, your history, and your doctor's interpretation matter far more than a single number.

Reading a CBC (Complete Blood Count) Report

The CBC is the most commonly ordered blood test in Pakistan. A standard CBC report from any major lab includes 20–22 parameters. Here are the ones patients most frequently ask about:

Haemoglobin (Hgb / Hb)

Haemoglobin is the protein in red blood cells that carries oxygen. It is the single most important number in a CBC for most Pakistani patients, because anaemia (low haemoglobin) is extremely prevalent — especially in women and children.

Result	What It Means	Common Cause in Pakistan
Normal (12–17.5 g/dL)	Red cell oxygen carrying is healthy	No action needed
Mildly Low (10–12 g/dL)	Mild anaemia	Iron deficiency, poor diet
Moderately Low (8–10 g/dL)	Moderate anaemia — symptoms likely	Chronic iron deficiency, thalassaemia
Severely Low (<8 g/dL)	Severe anaemia — needs urgent attention	Blood loss, thalassaemia major, B12 deficiency
High (>17.5 g/dL)	Elevated red cell mass	Dehydration, polycythaemia, high altitude

White Blood Cells (WBC / TLC — Total Leucocyte Count)

WBC measures your immune cells. It is one of the most frequently flagged values in a CBC, and one of the most commonly misunderstood. Your WBC can swing dramatically from day to day based on entirely normal factors.

High WBC (above 11,000/µL): Most commonly caused by a bacterial infection, viral illness, or physical stress. In a patient with fever, a high WBC is expected. A consistently very high WBC (>30,000) without a clear infection requires further investigation.
Low WBC (below 4,500/µL): Can be caused by viral infections (including dengue — very common in Pakistan), certain medications (especially TB drugs), autoimmune conditions, or nutritional deficiencies. A mild low WBC is rarely alarming alone.
Mildly elevated WBC (11,000–15,000) in a patient recovering from a cold: Completely normal. No action needed beyond treating the underlying illness.

Platelets (PLT)

Platelets are the cells that stop bleeding by forming clots. Platelet count is especially important in Pakistan because dengue fever — which causes a sudden dramatic fall in platelets — affects tens of thousands of Pakistanis every monsoon season.

Normal: 150,000–400,000/µL
Mildly low (100,000–150,000): Monitor closely — common in viral infections
Below 50,000: Risk of spontaneous bleeding — seek medical advice immediately
Below 20,000: Serious risk — this requires hospital-level management
High platelets (>400,000): Often reactive (after infection or inflammation) — rarely serious alone

The Differential Count (Neutrophils, Lymphocytes, Monocytes)

The differential breaks down the WBC into its component types. Pakistani labs typically report these as percentages and absolute counts. The most important practical point:

High neutrophils (>70%) + high WBC: Strongly suggests bacterial infection
High lymphocytes (>45%) + normal or low WBC: Strongly suggests viral infection
Low lymphocytes: Can be normal in stress or mild illness; persistent low count warrants investigation
High eosinophils (>7%): Common in Pakistan — often indicates intestinal parasites or allergic conditions

What the H, L, ★ and Coloured Flags Mean

Pakistani lab reports use slightly different notation depending on the lab's software, but the meaning is universal:

Flag	What It Means	Should You Worry?
H	High — above the upper reference limit	Depends entirely on how high, and which test. A slightly high WBC during a cold = normal.
L	Low — below the lower reference limit	Same as H. Context matters. Slightly low Vitamin D in a Pakistani adult is essentially universal.
★ or *	Critical value — significantly abnormal	Yes — a ★ flag means the lab considers this clinically significant. Contact your doctor the same day.
HH	Critically High — markedly above normal	Requires same-day medical review. The lab may have already called your referring doctor.
LL	Critically Low — markedly below normal	Same as HH — contact your doctor immediately.

✅ Practical Rule

A single H or L next to a mildly out-of-range value, with no symptoms and no prior history: show it to your doctor at your next scheduled visit. It does not require an emergency phone call at midnight. A ★, HH, or LL flag: contact your doctor the same day.

Reading an LFT (Liver Function Test) Report

LFT reports contain 8–10 values. Patients most often get confused by ALT, AST, and bilirubin. Here is a quick guide to each:

ALT (Alanine Aminotransferase): The most sensitive marker for liver cell damage. Mildly elevated in fatty liver, medications, and strenuous exercise. Significantly elevated in hepatitis. See our LFT price & context guide for related lab info.
AST (Aspartate Aminotransferase): Similar to ALT but also rises in heart and muscle injury. A high AST with normal ALT may point to a non-liver cause.
Bilirubin: The yellow pigment from broken-down red cells. Elevated bilirubin causes jaundice (yellow eyes and skin). Mild elevations are sometimes due to Gilbert's syndrome — a harmless genetic variant common in Pakistan.
Albumin: Made by the liver. Low albumin means the liver's manufacturing function is impaired — this is a marker of more advanced liver disease rather than early damage.
ALP (Alkaline Phosphatase): Rises in bile duct problems and bone disease. In children and adolescents, ALP is naturally higher because growing bones produce it — a high ALP in a 14-year-old is almost always normal.

Why Reference Ranges Differ Between Labs

This is something many Pakistani patients don't realise: the normal range printed on a Chughtai Lab report may be slightly different from the same test's normal range on an Aga Khan Lab report. This is not an error. Labs set reference ranges based on their own analyser calibration and their own patient population studies.

The practical implication: always compare your result to the reference range on your specific report, not to a range you found online or on a different lab's report. A value that is "normal" at Chughtai may be flagged as borderline at Aga Khan (or vice versa) purely because of reference range differences, not because one lab is more accurate.

When to Call Your Doctor vs When to Wait

Situation	Action
Any value flagged ★, HH, or LL	Call doctor today
Platelet count below 50,000	Call doctor today
Haemoglobin below 7 g/dL	Call doctor today
ALT more than 5× the upper limit	See doctor within 48 hours
WBC above 20,000 without known infection	See doctor within 48 hours
Single mildly flagged value (H or L), no symptoms	Mention at next scheduled visit
All values within reference range	File for future reference

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Frequently Asked Questions

What does H mean on a blood test report in Pakistan?

H means "High" — your result is above the upper limit of the reference range for that test. It does not automatically mean something is seriously wrong. Mild H flags are common and often have benign explanations. A ★ or HH flag is more significant and warrants same-day contact with your doctor.

Can I compare my results to last year's report from a different lab?

You can use it as a rough guide, but note that reference ranges and analyser calibration differ between labs. For trend monitoring over time, it is best to consistently use the same lab. If you must compare across labs, focus on large changes (not subtle 5–10% differences).

My report is in English but I don't understand it — is there an Urdu version?

Most Pakistani labs issue reports in English only, as medical terminology is standardised in English globally. Chughtai Lab's app does offer some Urdu translations for common values. Your doctor or a pharmacist can help explain your specific results in Urdu if needed.

Why did my CBC show different results last month at a different lab?

Small variations (5–15%) are normal between labs and even between draws from the same lab on different days. Factors include time of day, hydration level, recent exercise, and slight calibration differences between analysers. Focus on values that are significantly outside the reference range, not minor numerical differences.