Sample Questions
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Reference Ranges:
Full blood count (FBC)
Haemoglobin (Hb)
- Male: 130 – 180 g/L
- Female: 115 – 165 g/L
White cell count (WCC)
- Total: 3.6 – 11.0 x 10⁹/L
- Neutrophils: 1.8 – 7.5 x 10⁹/L
- Lymphocytes: 1.0 – 4.0 x 10⁹/L
- Monocytes: 0.2 – 0.8 x 10⁹/L
- Eosinophils: 0.1 – 0.4 x 10⁹/L
- Basophils: 0.02 – 0.10 x 10⁹/L
Platelet count
- 140 – 400 x10⁹/L
Red cell count (RCC)
- Male: 4.5 – 6.5 x 10⁹/L
- Female: 3.8 – 5.8 x 10⁹/L
Haematocrit
- Male: 0.40 – 0.54 /L
- Female: 0.37 – 0.47 /L
Mean cell volume (MCV)
- 80 – 100 fL
Mean corpuscular haemoglobin (MCH)
- 27 – 32 pg/cell
Reticulocyte count
- 0.2 – 2%
Coagulation
Prothrombin time (PT)
- 10 – 14 seconds
Activated partial thromboplastin time (APTT)
- 24 – 37 seconds
Fibrinogen
- 1.50 – 4.50 g/L
D-Dimer
- 500 ng/mL
Haematinics
Ferritin
- Male: 25 – 350 ng/mL
- Female: 10 – 300 ng/mL
Vitamin B12
- 180 – 1000 pg/mL
Folate
- 4.0 ng/mL
Total serum iron
- Male: 11.6 – 35.0 μmol/L
- Female: 4.6 – 30.4 μmol/L
Transferrin
- 2.0 – 3.6 g/L
Transferrin saturation
- 20 – 50%
Total iron binding capacity (TIBC)
- 45 – 81 μmol/L
Erythrocyte sedimentation rate (ESR)
- Male: ≤ 49 years: 1 – 7
- Male: ≥ 50 years: 2 – 10
- Female: ≤ 49 years: 3 – 9
- Female: ≥ 50 years: 5 – 15
Urea & electrolytes
Na⁺
- 133 – 146 mmol/L
K⁺
- 3.5 – 5.3 mmol/L
Ca²⁺ (adjusted)
- 2.2 – 2.6 mmol/L
Mg²⁺
- 0.7 – 1.0 mmol/L
Phosphate
- 0.74 – 1.4 mmol/L
Chloride
- 98 – 106 mmol/L
Urea
- 2.5 – 7.8 mmol/L
Creatinine
- Male: 59 – 104 μmol/L
- Female: 45 – 84 μmol/ L
Liver function tests (LFTs)
Alkaline phosphatase (ALP)
- 30 – 130 U/L
Alanine aminotransferase (ALT)
- Male: < 41 U/L
- Female: < 33 U/L
Aspartate aminotransferase (AST)
- 1 – 45 U/l
Bilirubin
- <21 μmol/L
GGT
- Male: < 60 U/L
- Female: < 40 U/L
Albumin
- 35 – 50 g/L
Inflammatory markers
CRP
- 5mg/L
Arterial blood gas
pH
- 7.35 – 7.45
PaO₂
- 11 – 13 kPa (82.5 – 97.5 mmHg)
PaCO₂
- 4.7 – 6.0 kPa (35.2 – 45 mmHg)
HCO₃
- 22 – 26 mmol/L
Base excess (BE)
- (-2 to +2 mmol/L)
Metabolic tests
Serum ketones
- < 0.6 mmol/L
Fasting blood glucose
- 4.0 to 6.0 mmol/L
Postprandial (2 hours after eating)
- up to 7.8 mmol/L
HbA1c
- < 42 mmol/mol (6.0%)
Cholesterol
- < 5 mmol/L
Triglyceride
- 0.55 – 1.90 mmol/L
LDL
- < 3mmol/L
HDL
- > 1 mmol/L
Cholesterol/HDL
- < 4
Endocrinology
TSH
- 0.4 – 5.0 mU/L²
Free T4
- 9 – 24 pmol/L
Free T3
- 3.5 – 7.8 pmol/L
Parathyroid hormone
- 10 – 65 ng/L
Growth hormone (random)
- < 5 ng/mL
- < 10 ng/mL
Cortisol (random)
- 137 – 429 nmol/L
Testosterone
- Male <50: 10-45 nmol
- Male >50: 6.2-26 nmol
Other biochemistry tests
Serum total protein
- 60 – 78 g/L
Troponin T
- < 0.01 µg/L
Creatine kinase (CK)
- Male: 40 – 320 U/L
- Female: 25 – 200 U/L
Lactate dehydrogenase (LDH)
- 240 – 480 U/L
Lactate (plasma)
- 0.5 – 2.2 mmol/L
Urate
- Male: 200 – 430 μmol/L
- Female: 140 – 360 μmol/L
Amylase
- 28 – 100 U/dL
Ammonia
- 10 – 35 μmol/L
NT-proBNP
- <75 years: <125 pg/mL
- >75 years: <450 pg/mL
Copper
- 70 – 150 μg/dL
Ceruloplasmin
- 15 – 60 μmol/L
Vitamin D
- >50 nmol/L
Serum osmolality
- 275 – 295 mOsmol/kg
24h urine osmolality
- 500 – 800 mOsm/kg
Random urine osmolality
- 300 – 900 mOsm/kg
12h fluid restricted urine osmolality
- >850 mOsm/kg
24h urine sodium (Na⁺)
- 100 – 260 mmol/24h
24h urine potassium (K⁺)
- 25 – 100 mmol/24h
24h urine total protein
- < 100 mg/24h
Urine pH (random)
- 5 – 7
Adult vital signs
Body temperature
- 36.5°C to 37.3°C
- 97.8°F to 99.1°F
Pulse
- 60 – 100 beats per minute
Blood pressure
- 90/60 – 120/80 mmHg
Respiratory rate
- 18 breaths per minute
Pulse oximetry
- >94%
Paediatric vital signs
Blood pressure
- < 1 year: 70 – 90 mmHg
- 1 – 2 years: 80 – 95 mmHg
- 2 – 5 years: 80 – 100 mmHg
- 5 – 12 years: 90– 110 mmHg
Heart rate
- < 1 year: 110 – 160
- 1 – 2 years: 100 – 150
- 2 – 5 years: 95 – 140
- 5 – 12 years: 80 – 120
Respiratory rate
- < 1 year: 30 – 40
- 1 – 2 years: 25 – 35
- 2 – 5 years: 25 – 30
- 5 – 12 years: 20 – 25
Tumour markers
Beta human chorionic gonadotrophin (bHCG)
- < 5 mU/mL
Alpha fetoprotein
- < 44 ng/mL
Prostate specific antigen (PSA)
- < 4.0 ng/mL
Carcinoembryonic antigen (CEA)
- Non-smokers at 50 years: < 3.6μg/L
- Non-smokers at 70 years: < 4.1μg/L
- Smokers: < 5μg/L
CA-125
- < 35 U/mL
CA19-9
- < 40 U/mL
Immunology
Anti-SS-A (La)
- Negative: < 3 U/mL
- Positive: > 4 U/mL
Anti-streptolysin O titre (ASOT)
- Pre-school age: < 100
- School age: < 250
- Adults: < 125
Rheumatoid factor (RF)
- Negative: < 20 U/mL
- Positive: > 30 U/mL
Anti-mitochondrial antibodies (AMA)
- Negative: < 10 U/mL
- Positive: > 10 U/mL
Perinuclear anti-neutrophil cytoplasmic antibodies (p-ANCA)
- Negative: < 5 U/mL
- Positive: > 5 U/mL
Anti-histone antibodies
- Negative: < 25 U/mL
- Positive: > 25 U/mL
IgA
- 110 – 560 mg/dL
IgD
- 0.5 – 3.0 mg/dL
IgE
- 0.01 – 0.04 mg/dL
IgG
- 800 – 1800 mg/dL
IgM
- 54 – 200 mg/d
Anti-ds-DNA
- Negative: < 40 U/mL
- Positive: > 60 U/mL
Anti-ss-DNA
- Negative: < 8 U/mL
- Positive: > 10 U/mL
Cytoplasmic anti-neutrophil cytoplasmic antibodies (c-ANCA)
- Negative: < 20 U/mL
- Positive: > 30 U/mL
Anti-SS-A (Ro)
- Negative: < 15 U/mL
- Positive: > 25 U/mL
Lumbar puncture results
Appearance
- Clear and colourless
White blood cells (WBC)
- 0 – 5 cells/µL
- No neutrophils present, primarily lymphocytes
- Normal cell counts do not rule out meningitis or any other pathology
Red blood cells (RBC)
- 0 – 10/mm³
Protein
- 0.15 – 0.45 g/L (or <1% of the serum protein concentration)
Glucose
- 2.8 – 4.2 mmol/L (or ≥ 60% plasma glucose concentration)
Opening pressure
- 10 – 20 cm H₂O