1. What is Lymphocyte Count?

Lymphocyte count is the absolute number of lymphocytes in the blood, calculated by multiplying the total white blood cell count (WBC) by the fraction of lymphocytes in the differential count.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( WBC \) — White blood cell count (cells/μL)
• \( Lymph Fraction \) — Fraction of lymphocytes in differential (0-1)

Explanation: This calculation converts the relative percentage of lymphocytes from a complete blood count (CBC) into an absolute count, which is more clinically meaningful.

3. Importance of Lymphocyte Count

Details: Absolute lymphocyte count helps diagnose and monitor immune disorders, infections, lymphomas, and response to chemotherapy. It's more reliable than percentage alone for clinical decisions.

4. Using the Calculator

Tips: Enter WBC in cells/μL and lymphocyte fraction as a decimal (e.g., 0.25 for 25%). Both values must be positive (WBC > 0, 0 < fraction ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: What's a normal lymphocyte count?
A: Normal range is typically 1,000-4,800 cells/μL in adults, but varies by age and laboratory.

Q2: Why calculate absolute count instead of using percentage?
A: Absolute counts better reflect actual immune status, especially when WBC is abnormal.

Q3: What causes high lymphocyte count (lymphocytosis)?
A: Viral infections, chronic inflammatory conditions, lymphocytic leukemias, and stress response.

Q4: What causes low lymphocyte count (lymphopenia)?
A: HIV/AIDS, chemotherapy, radiation, autoimmune disorders, and certain medications.

Q5: How often should lymphocyte count be checked?
A: Frequency depends on clinical condition - may range from daily in hospitalized patients to annually for general screening.