About

A Complete Blood Count (CBC) measures the cellular components of blood. Physicians use this test to screen for anemia, infection, and leukemia. Accurate interpretation depends strictly on the reference range, which varies significantly by age and biological sex. A hemoglobin level considered normal for an adult male indicates polycythemia in an infant. This tool compares user inputs against a composite database derived from WHO and Mayo Clinic standards. It highlights deviations from the reference interval. Results outside the reference range require clinical correlation.

Formulas

The analyzer evaluates if a value x lies within the closed interval [L, H].

{

LOW if x < LNORMAL if L ≤ x ≤ HHIGH if x > H

Conversion between g/dL and g/L relies on the factor:

Value_g/L = Value_g/dL × 10

Reference Data

Marker	Unit	Adult Male	Adult Female	Newborn
Hemoglobin (Hb)	g/dL	13.2 − 16.6	11.6 − 15.0	14.0 − 24.0
Hematocrit (Hct)	%	38.3 − 48.6	35.5 − 44.9	44.0 − 64.0
RBC Count	10^6/μL	4.35 − 5.65	3.92 − 5.13	4.80 − 7.10
WBC Count	10^3/μL	3.4 − 9.6	3.4 − 9.6	9.0 − 30.0
Platelets	10^3/μL	135 − 317	157 − 371	150 − 450
MCV	fL	80 − 100	80 − 100	96 − 108
MCH	pg	27 − 33	27 − 33	32 − 34
Neutrophils	%	40 − 60	40 − 60	40 − 80

Frequently Asked Questions

Laboratories use different equipment and reagents. The population served by the lab also affects the local reference range. Always prioritize the range printed on your specific lab report over generic online tools.

High hemoglobin, or polycythemia, may result from dehydration, smoking, high altitude living, or underlying bone marrow disorders like polycythemia vera.

Mild leukopenia (low WBC) is common and can be ethnic benign neutropenia or a viral aftermath. It does not always indicate a compromised immune system, but persistent lows warrant investigation.

Newborns have much higher Hemoglobin and WBC counts than adults. These levels drop rapidly in the first months of life. Elderly patients often show slightly lower Hemoglobin levels due to reduced marrow activity.