Is low Hb always iron deficiency?

CBC

CBC (Complete Blood Count)

Hemoglobin, WBC and platelets — the universal health snapshot.

Updated: 12 August 2026

Do not diagnose based on one lab value. Ranges vary by lab, method, age, pregnancy and medicines — always interpret trends with your doctor.

What the test measures

RBC, hemoglobin, WBC differential, platelets, indices.

Why doctors order it

Fatigue, fever, infection workup
Anemia typing
Pre-treatment baseline

Preparation

No fasting needed

Normal range & abnormal meaning

Hb ~13–17 (M) / 12–15 (F) g/dL; WBC 4–11k; platelets 150–400k (lab-specific).

Low Hb: anemia — type with ferritin/B12
High WBC: infection/inflammation; low platelets: dengue/marrow issues

Limitations

Pattern test — needs clinical context, not solo diagnosis

Questions to ask your doctor

What type of anemia do I have?
Should ferritin/B12 follow?

FAQs

No — B12, thalassemia trait and chronic disease also lower Hb. Type before treating.

References

WHO Anemia Guidance — WHO

Related diseases

Anemia Fever Guide Iron Deficiency

This website provides general educational information and is not a substitute for professional medical diagnosis, treatment or emergency care. Always consult a qualified healthcare professional.