The NursingCalc nursing math cheat sheet collects every essential formula, normal laboratory value, unit conversion factor, and clinical reference table a nurse needs in one place. Bookmark this page for instant access during nursing school study, NCLEX preparation, and clinical practice. All formulas are sourced from peer-reviewed references and verified against current clinical guidelines.
| Lab Test | Normal Range | Units |
|---|---|---|
| pH (arterial) | 7.35 – 7.45 | — |
| PaCO₂ | 35 – 45 | mmHg |
| PaO₂ | 80 – 100 | mmHg |
| HCO₃⁻ | 22 – 26 | mEq/L |
| Sodium (Na⁺) | 135 – 145 | mEq/L |
| Potassium (K⁺) | 3.5 – 5.0 | mEq/L |
| Chloride (Cl⁻) | 98 – 106 | mEq/L |
| Bicarbonate (HCO₃⁻) | 22 – 29 | mEq/L |
| Glucose (fasting) | 70 – 99 | mg/dL |
| BUN | 7 – 20 | mg/dL |
| Creatinine (male) | 0.7 – 1.3 | mg/dL |
| Creatinine (female) | 0.5 – 1.1 | mg/dL |
| Haemoglobin (male) | 13.5 – 17.5 | g/dL |
| Haemoglobin (female) | 12.0 – 15.5 | g/dL |
| WBC | 4,500 – 11,000 | /μL |
| Platelets | 150,000 – 400,000 | /μL |
| INR (therapeutic) | 2.0 – 3.0 | — |