1. What is Corrected ESR?

The corrected ESR adjusts the erythrocyte sedimentation rate (ESR) for hematocrit (Hct) levels, providing a more accurate measure of inflammation in patients with abnormal hematocrit values.

2. How Does the Calculator Work?

The calculator uses the corrected ESR formula:

Where:

• ESR — Erythrocyte sedimentation rate (mm/hr)
• Hct — Hematocrit (percentage)

Explanation: The formula accounts for the inverse relationship between hematocrit and ESR, as higher hematocrit levels typically result in lower ESR values.

3. Importance of Corrected ESR

Details: Correction is particularly important in patients with anemia or polycythemia, where uncorrected ESR values may be misleading. It helps in accurate assessment of inflammatory conditions.

4. Using the Calculator

Tips: Enter ESR in mm/hr and hematocrit as a percentage. Note that the formula is not valid for hematocrit values ≥55%.

5. Frequently Asked Questions (FAQ)

Q1: Why correct ESR for hematocrit?
A: ESR is inversely related to hematocrit. Correction provides a more accurate reflection of inflammation in patients with abnormal hematocrit levels.

Q2: When should corrected ESR be used?
A: Particularly useful in patients with anemia (low Hct) or polycythemia (high Hct) where standard ESR values may be misleading.

Q3: What are normal corrected ESR values?
A: Similar to standard ESR ranges (typically <20 mm/hr for men, <30 mm/hr for women), but consult local laboratory reference ranges.

Q4: Are there limitations to this correction?
A: The formula becomes invalid when hematocrit ≥55%. Other factors like red cell morphology can also affect ESR.

Q5: How does this compare to other ESR correction methods?
A: This is a simple correction formula. Some laboratories may use more complex methods or direct measurement techniques.