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Lymphocyte Count

✅ Up to date🔬 Evidence: LimitedInternal Medicine
Diğer adları: Absolute lymphocyte count, ALC, Lymphocyte count
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Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.

⚡ Key Facts

• The white blood cell subtype responsible for immune memory and adaptive defense • Normal: 1,000–4,000/µL • Important for viral infection response • Low counts may indicate immune suppression

🧪 What Does This Test Measure?

The lymphocyte count measures the white blood cell subtype responsible for adaptive immunity, including T cells, B cells, and NK cells involved in viral defense.

📋 Why Is It Ordered?

Ordered for viral infection evaluation, immune system monitoring, hematologic disease assessment, and medication follow-up.

🔧 Preparation

No special preparation is required. Part of the CBC. Acute stress and exercise may transiently affect counts.

📊 Reference Ranges

Normal: 1,000–4,000/µL (1.0–4.0 × 10⁹/L) Low (lymphopenia): <1,000/µL High (lymphocytosis): >4,000/µL ⚠️ Reference ranges vary by laboratory.

⬆️ High Values

Elevated lymphocytes may be associated with viral infections, chronic lymphocytic leukemia, certain bacterial infections, or autoimmune conditions.

⬇️ Low Values

Low lymphocytes (lymphopenia) may be associated with HIV infection, corticosteroid use, chemotherapy, autoimmune diseases, or severe stress.

⚙️ What Can Affect Results?

Viral infections, corticosteroids, chemotherapy, stress, exercise, age, and daily variation may affect lymphocyte counts.

🔬 Evidence Summary

Limited evidence: 4 reviews.

✅ Key Takeaways

💡

What you learned: Lymphocytes are essential for adaptive immunity. Low counts may suggest immune suppression and warrant further evaluation.

⛔

A lymphocyte count alone cannot diagnose immune deficiency or infection. Clinical context is needed.

🔬 Sources Used on This Page

4 sources · Most recent publication: 2019
📖
Review
Comprehensive topic evaluation
4
sources
Overall assessment: Evidence level for this topic is limited. This page is supported by 4 reviews.

📝 Questions to Ask Your Doctor

Be prepared for your appointment. Add questions to your list.

Last reviewed: 4/2/2026
Next review: 7/2/2026

⚖️ Comparisons

Neutrophil vs Lymphocyte→

🔗 Related Topics

🧪 Lökosit / WBC (total beyaz küre sayısı)🧪 Nötrofil (bakteriyel enfeksiyon alt tipi)🧪 Hemogram (tam kan sayımı — genel bakış)🧪 CRP (C-reaktif protein)🧪 Sedimantasyon (ESR)
⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.