DLC Test Or Differential Leukocytes Count | An Overview


DIFFERENTIAL LEUKOCYTES COUNTDLC Test Or Differential Leukocytes Count

What Is DLC Test? Or DLC-Blood Test?

Similiar to TLC Testfull form of dlc in blood or DLC stands for Differential Leukocytes Count in blood. DLC Test is also a blood test to measure the percentage of different type of WBC (White Blood Cells). It has been classified into 5 parts. Here are the dlc normal range in human body for all 5 categories of DLC test in blood: 

AGE Neutrophils Lymphocytes Monocytes Eosinophils Basophils
Adults > 18 years  44-68 % 25-44% 0-7% 0-4 % 0-2%
BIRTH 51-71% 21-41%  2-10 % 0-4 % 0-2%
12 HRS 58-78% 16-32% 1-9 % 0-4 % 0-2%
24 HRS 51-71% 21-41% 2-10 % 0-4 % 0-2%
2-7 DAYS 35-55% 31-51%  3-15 % 0-8 % 0-2%
8-14 DAYS 30-50% 38-58%  3-15 % 0-7 % 0-2%
15-30 DAYS 25-45% 46-66%  1-13 % 0-7 % 0-2%
1-6 MONTH 22-45% 46-71% 1-13 % 0-7 % 0-2%
0.5-1 YRS 21-42% 51-71%  1-9 % 0-7 % 0-2%
1-2 YRS 21-43% 49-71%  1-9 % 0-7 % 0-2%
2-4 YRS 23-52% 40-69%  1-9 % 0-7 % 0-2%
4-6 YRS 32-61% 32-60%  1-9 % 0-7 % 0-2%
6-8 YRS 41-63% 29-52%  0-9 % 0-7 % 0-2%
8-10 YRS 43-64% 28-49%  0-8 % 0-4% 0-2%
10-16 YRS 44-67% 25-48%  0-9 %  0-7 % 0-2%
16-18 YRS 44-68% 25-48%  0-9 %  0-7 % 0-2%

NOTE: Normal range values slightly differ among different pathology labs.


Differential Leukocytes Count

It is important to realize that an abnormal increase in one type of white blood cell can cause a decrease in the percentage of other types of white blood cells.


These are the most common WBC that fight infections. Neutrophils normal range for adults is between 44% and 68%. Generally, below value means a decrease in WBC. If Neutrophils counts are high, it indicates a bacterial or fungal infection.

Physical/ mental stress and even smoking can also increase the neutrophil count in DLC test. In that case, the doctor might suggest you for skin or culture test or test for other bacterial infections depends on the symptoms of the disease you have.

What Does It Mean When Your Neutrophils Are High?

High neutrophils  in DLC Test indicates that one of the following infection/ diseases may diagnose:

Eclampsia seizures or coma in a pregnant woman
Acute infection Infection for a certain(short) time period
Gout type of arthritis due to uric acid build up in the blood
Myelocytic leukaemia a bone marrow cancer
Rheumatoid arthritis an autoimmune disease that causes chronic inflammation of the joints
Rheumatic fever disease due to an infection with group A streptococcus bacteria
Thyroiditis a thyroid disease
Trauma An emergency condition
Neutrophils Low Indicates:

If neutrophils low in DLC test blood sample, It may be due to:

Aplastic anemia Aplastic anemia is a rare but serious blood disorder. The patient’s bone marrow doesn’t make enough new blood cells
Chemotherapy A medicinal treatment to treat cancer by damaging cancer cell
Influenza (flu) A type of viral infection
Radiation therapy or exposure A therapy to treat cancer that uses high energy of radiation to kill cancer cells and shrink tumors
Viral infection Infection due to the virus
Bacterial infection Widespread severe infection caused by bacteria

2. Lymphocytes:

Neutrophils normal range

Lymphocytes counts are responsible for immune response & regulation of antibody production. Lymphocytes range varies from 25% to 44% and categorized into two parts: B cells and T cells:

  1. The B cells produce antibodies that are used to attack invading bacteria, viruses, and parasites.
  2. The T cells destroy the body’s own cells that have themselves been taken over by viruses or become cancerous.
Lymphocytes high:

The percentage value of high Lymphocytes in DLC count test indicates some inflammatory disease is developing in the body. It may be due to the following reason:

Chronic bacterial infection Infection due to bacteria for a prolonged period
Infectious hepatitis  liver swelling and inflammation from bacteria or viruses
Infectious mononucleosis a viral infection that causes fever, sore throat, and swollen lymph glands
Lymphocytic leukemia a type of blood cancer
Multiple myelomas a type of blood cancer
Viral infection such as mumps or measles
Lymphocytes Low:

Lymphocytes low percentage value usually indicates that a viral infection is developing in the body. The following reason may be the reason behind:

 Chemotherapy A medicinal treatment to treat cancer by damaging cancer cell

HIV/AIDS infection

A virus infection that weakens your body’s immune system. It destroys the white blood cells that fight infection.


is cancer that affects the blood and bone marrow where blood cells are made
 Radiation therapy or exposure A therapy to treat cancer that uses high energy of radiation to kill cancer cells and shrink tumors


severe, inflammatory response to bacteria or other germs

Steroid use

Anabolic steroid abuse may incredibly damaging to the body and lowers lymphocytes in the blood.

3. Monocytes:

monocytes high

Cells that sometimes ingest/digest foreign particles like bacteria, carbon, dust, etc. Monocytes range for an adult is 0 – 7%. Monocytes high value in DLC test indicates severe stress, chronic infection or abscess.

Another cause is long-term use of steroids or long-term exposure to toxic chemicals such as dyes or insecticides.

The percentage value of high Monocytes  in DLC blood test may indicate the following infection/ disease:

Chronic inflammatory disease A disease cause inflammation for a prolonged period
Leukemia is a type of cancer that affects the blood and bone marrow where blood cells are made
Parasitic infection A parasitic disease, also known as parasitosis, is an infectious disease caused or transmitted by a parasite
Tuberculosis, or TB  a bacterial infection that involves the lungs
Viral infection e.g. infectious mononucleosis, mumps, measles
 Monocytes Low:

Monocytes count low percentage value in the blood caused by anything that decreases in white blood cell counts, such as bloodstream infection, chemotherapy, or a bone marrow disorder.

4. Eosinophils:

Eosinophils in DLC test is also a type of WBC that helps to increase body’s response to allergic reactions, asthma, and infection with parasites. Eosinophil normal value is 0 – 4% for adults.

Eosinophils are made in the body’s bone marrow, and then merge into the blood and circulate around the body.  Eosinophils high value in DLC blood test indicates allergic infection, chronic fungal infection or worm infestation.

Besides this the following disease/ Infection may trigger eosinophils counts high percentage of blood:

Addison disease  adrenal glands do not produce enough hormones
Allergic reaction


An adverse reaction by different kind of allergens
Cancer a group of diseases in which cells take enormous growth
Chronic myelogenous leukemia cancer of the white blood cells
Collagen vascular disease  These are the disorders of arthritis and inflammation of arteries in the tissues
Hypereosinophilic syndromes (HES) is a disease characterized by a persistently elevated eosinophil count in the blood for at least six months without any recognizable cause
Eosinophils Low Value:

Eosinophil low percentage value is usually not a cause for concern and is actually quite common. Eosinophils low level may diagnose administration of steroids.

5. Basophils:

basophils high

Basophils in DLC test Controls inflammation & damage to the body.

Basophils high:

The percentage value of high Basophils in DLC test indicates some blood diseases and poisoning. Basophils counts high percentage value or increased Basophils in Blood may be due to:

After splenectomy Removal of spleen
Allergic reaction An adverse reaction by different kind of allergens
Chronic myelogenous leukemia  a type of bone marrow cancer
Collagen vascular disease These are the disorders of arthritis and inflammation of arteries in the tissues
Myeloproliferative diseases group of bone marrow diseases
Chickenpox A highly contagious disease caused by the varicella-zoster virus

Lower Basophils percentage may be due to:

  • Acute infection
  • Cancer
  • Severe injury






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Comment ( 1 )
  1. KN
    November 19, 2018 at 8:23 am



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