Rule of Three Hematology Calculator
The rule of three in hematology is a crucial tool for healthcare professionals to estimate red blood cell (RBC) count, hemoglobin (Hb), and hematocrit (HCT) from a single measured value. This calculator simplifies the process, providing instant results and visualizations.
- Select your patient’s hematocrit (HCT) percentage.
- Select their mean corpuscular volume (MCV).
- Click ‘Calculate’.
The rule of three uses the following formulas to estimate RBC count, Hb, and HCT:
- RBC count = (HCT / MCV) * 1000
- Hb = (HCT * 3) / (MCV * 10)
- Estimated HCT = (RBC count * MCV) / 1000
| Patient | Actual HCT | Estimated HCT | Difference |
|---|---|---|---|
| 1 | 42% | 41.8% | 0.2% |
- Always confirm estimates with actual lab results.
- Consider patient-specific factors that may affect results.
What is the rule of three in hematology?
The rule of three is a simple method used to estimate red blood cell count, hemoglobin, and hematocrit from a single measured value in hematology.
Learn more about the rule of three from this authoritative source.