Common Laboratory Test Reference Ranges

These flashcards cover the key reference ranges for common serum electrolytes, arterial blood gases, complete blood count parameters, coagulation profiles, liver and renal function tests, cardiac enzymes, inflammatory markers, lipid profile, and glucose measurements.

What is the normal reference range for serum sodium (Na)?

136–145 mmol/L

What is the normal reference range for serum potassium (K)?

3.5–5.0 mmol/L

What is the normal reference range for serum magnesium (Mg)?

0.8–1.3 mmol/L

What is the normal reference range for serum calcium (Ca)?

2.2–2.6 mmol/L

What is the normal reference range for serum chloride (Cl)?

98–106 mmol/L

What is the normal reference range for serum phosphate (PO₄)?

0.97–1.45 mmol/L

What is the normal arterial blood pH?

7.38–7.44

What is the normal arterial partial pressure of CO₂ (PaCO₂)?

5.1–5.6 kPa

What is the normal arterial partial pressure of O₂ (PaO₂)?

10–13.3 kPa

What is the normal arterial bicarbonate (HCO₃⁻) concentration?

23–26 mmol/L

What is the normal arterial oxygen saturation (SaO₂)?

95–100 %

What is the normal haemoglobin (Hgb) range in adult males?

14–18 g/dL

What is the normal haemoglobin (Hgb) range in adult females?

12–16 g/dL

What is the normal haematocrit (HCT) range in adult males?

0.42–0.50

What is the normal haematocrit (HCT) range in adult females?

0.37–0.47

What is the normal red blood cell (RBC) count?

4.2–5.9 × 10¹²/L

What is the normal white blood cell (WBC) count?

4.5–11 × 10⁹/L

What is the normal platelet (PLT) count?

150–450 × 10⁹/L

What is the normal mean corpuscular volume (MCV)?

80–98 fL

What is the normal mean corpuscular haemoglobin (MCH)?

28–32 pg

What is the normal mean corpuscular haemoglobin concentration (MCHC)?

33–36 g/dL

What is the normal red cell distribution width (RDW)?

9.0–14.5 %

What is the normal reticulocyte count as a percentage of RBCs?

0.5–1.5 % of RBCs

What proportion of WBCs are normally neutrophils?

65–75 % (2.25–7.70 × 10⁹/L)

What proportion of WBCs are normally lymphocytes?

20–35 % (1.35–4.95 × 10⁹/L)

What is the normal absolute monocyte count?

≤ 0.66 × 10⁹/L

What is the normal absolute eosinophil count?

≤ 0.33 × 10⁹/L

What is the normal absolute basophil count?

≤ 0.11 × 10⁹/L

What is the normal serum iron concentration?

9–27 μmol/L

What is the normal serum ferritin range in adult males?

24–336 ng/L

What is the normal serum ferritin range in adult females?

11–307 ng/L

What is the normal transferrin concentration?

200–400 mg/dL

What is the normal total iron-binding capacity (TIBC)?

44.8–55.5 μmol/L

What is the normal international normalised ratio (INR) for an una nticoagulated patient?

0.9–1.2

What is the normal activated partial thromboplastin time (aPTT)?

25–35 seconds

What is the normal D-dimer level?

< 0.5 μg/mL

What is the normal alanine aminotransferase (ALT) level?

10–40 U/L

What is the normal aspartate aminotransferase (AST) level?

10–40 U/L

What is the normal alkaline phosphatase (ALP) level?

30–120 U/L

What is the normal gamma-glutamyl transferase (GGT) range in males?

9–50 U/L

What is the normal gamma-glutamyl transferase (GGT) range in females?

8–40 U/L

What is the normal total bilirubin concentration?

5.1–17.1 μmol/L

What is the normal serum albumin concentration?

35–55 g/L

What is the normal total serum protein concentration?

55–90 g/L

What is the normal serum creatinine range in adult males?

62–115 μmol/L

What is the normal serum creatinine range in adult females?

44–97 μmol/L

What is the normal blood urea nitrogen (BUN) level?

2.9–7.1 mmol/L

What is the normal estimated glomerular filtration rate (eGFR)?

≥ 90 mL/min/1.73 m² is considered normal

What is the normal cardiac troponin I level?

< 0.04 μg/L (ng/mL)

What is the normal cardiac troponin T level?

< 0.01 μg/L (ng/mL)

What is the normal total creatine kinase (CK) range in males?

0.9–2.8 µkat/L

What is the normal total creatine kinase (CK) range in females?

0.5–2.3 µkat/L

What percentage of total CK should be CK-MB under normal conditions?

< 5 % of total CK

What is the normal C-reactive protein (CRP) level?

≤ 0.8 mg/dL

What is the normal erythrocyte sedimentation rate (ESR)?

0–20 mm/hr

What is the normal fasting blood glucose level?

3.9–5.5 mmol/L

What is the desirable total cholesterol level?

< 5.2 mmol/L

What is the optimal high-density lipoprotein (HDL) cholesterol level?

≥ 1 mmol/L

What range of low-density lipoprotein (LDL) cholesterol is considered borderline high?

3.4–4.1 mmol/L

What is the normal triglyceride (TG) level?

< 1.7 mmol/L