📋 Common Lab Reference Ranges & Critical Values
Common adult reference ranges for CBC, chemistry, renal, liver and coagulation panels, plus common critical values. Browser-side quick reference.
Ranges vary by lab, method, population, age and sex.
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When to use
A bedside reminder of typical adult ranges — always defer to your own laboratory's printed range and critical-value policy.
How it works
Examples: WBC (3.5–9.5) ×10⁹/L, Na 135–145 mmol/L, INR ≈ 0.8–1.2, total bilirubin ≤ 21 µmol/L.
Key points
- Ranges vary by lab, method, population, age and sex.
- Always defer to the range printed on your own report.
- Critical-value thresholds are set by each hospital.
- Critical values require immediate reporting and action.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Panel | Complete blood count |
|---|
→ReferenceComplete blood count (adult, common)
- WBC：(3.5–9.5) ×10⁹/L
- Hb：Men 130–175, women 115–150 g/L
- Platelets：(125–350) ×10⁹/L
| Panel | Common critical values |
|---|
→ReferenceCommon critical values (examples, vary by hospital)
- Potassium：< 2.5 or > 6.0 mmol/L
- Sodium/calcium：Na < 120 or > 160; Ca < 1.5 or > 3.5 mmol/L
- Glucose：< 2.2 or > 22.2 mmol/L
Frequently asked questions
- What is Common Lab Reference Ranges & Critical Values?
- Common adult reference ranges for CBC, chemistry, renal, liver and coagulation panels, plus common critical values. Browser-side quick reference.
- How is Common Lab Reference Ranges & Critical Values calculated? What is the core formula?
- Examples: WBC (3.5–9.5) ×10⁹/L, Na 135–145 mmol/L, INR ≈ 0.8–1.2, total bilirubin ≤ 21 µmol/L.
- When is Common Lab Reference Ranges & Critical Values used?
- A bedside reminder of typical adult ranges — always defer to your own laboratory's printed range and critical-value policy.
- What are the key clinical points for Common Lab Reference Ranges & Critical Values?
- Ranges vary by lab, method, population, age and sex. Always defer to the range printed on your own report. Critical-value thresholds are set by each hospital. Critical values require immediate reporting and action.
- What are the limits and cautions when using Common Lab Reference Ranges & Critical Values?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Common Lab Reference Ranges & Critical Values calculated in practice? Can you show a worked example?
- Inputs: Panel Complete blood count → Result: Reference Complete blood count (adult, common)（WBC: (3.5–9.5) ×10⁹/L, Hb: Men 130–175, women 115–150 g/L, Platelets: (125–350) ×10⁹/L） Inputs: Panel Common critical values → Result: Reference Common critical values (examples, vary by hospital)（Potassium: < 2.5 or > 6.0 mmol/L, Sodium/calcium: Na < 120 or > 160; Ca < 1.5 or > 3.5 mmol/L, Glucose: < 2.2 or > 22.2 mmol/L）