What does a complete blood count (CBC) primarily check for in children with fever?

Dec 26, 2024 Source: Cainiu Health

Dr. Zhou Xiaofeng

Introduction

In general, fever refers to an elevated body temperature. When a child has a fever, a routine blood test can mainly examine indicators such as white blood cell count, neutrophil percentage, absolute lymphocyte count, red blood cell count, and platelet count. If there are any discomforts, it is recommended to seek medical attention promptly. In addition, routine blood tests may also include C-reactive protein and hemoglobin concentration.

Generally speaking, fever refers to an elevated body temperature. When a child has a fever, a routine blood test can mainly observe indicators such as white blood cell count, neutrophil percentage, absolute lymphocyte count, red blood cell count, and platelet count. If there is any discomfort, timely medical consultation is recommended. Detailed analysis is as follows:

1. White Blood Cell Count

A routine blood test allows for the observation of white blood cell (WBC) count. The normal WBC range is 4–12 × 10⁹/L. If the count is abnormally high or low, inflammation or immune system disorders should be promptly ruled out.

2. Neutrophil Percentage

Neutrophils, a type of white blood cell, have a phagocytic function and play a key role in fighting bacterial infections. The normal neutrophil percentage range is 50%–70%. An elevated percentage may indicate a bacterial infection that requires timely evaluation.

3. Absolute Lymphocyte Count

Lymphocytes are also a type of white blood cell and primarily help the body resist viral infections. The normal absolute lymphocyte count range is (0.8–4.0) × 10⁹/L. A count higher than normal may indicate the presence of a viral infection within the body.

4. Red Blood Cell Count

The red blood cell (RBC) count evaluates the number of red blood cells, which are primarily responsible for transporting oxygen and carbon dioxide. In children, the normal RBC count ranges between 3.9–5.3 × 10¹²/L. A count below this range may indicate anemia or other hematologic disorders.

5. Platelet Count

Platelet count evaluates the number of platelets in the blood. The normal platelet count range is 100–300 × 10⁹/L. A count above the normal range may indicate a tendency toward bleeding, while a count below the normal range may suggest a coagulation disorder and requires close attention.

In addition, routine blood testing may also include C-reactive protein (CRP) and hemoglobin concentration. It is recommended to take targeted actions promptly based on test results to avoid delays in treatment.

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What methods can quickly reduce fever in children?

In general, a child's fever may be caused by factors such as excessive environmental temperature leading to insufficient heat dissipation, immune response after vaccination, upper respiratory tract infection, acute gastroenteritis, or bacterial pneumonia. It is recommended to seek timely medical attention, identify the underlying cause, and then improve the condition through physical cooling methods, medication, and other treatments under a doctor's guidance. Additionally, it is important to ensure the child's daily diet is light and easily digestible, avoiding oily and spicy foods.

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At what temperature will a child experience convulsions due to fever?

In general, there is no fixed temperature threshold at which a child will experience seizures during fever. Most often, seizures occur when body temperature rapidly rises above 38.5°C. However, some children may experience seizures even if their temperature does not reach 38.5°C. This primarily relates to individual physical condition and the speed at which body temperature rises. When a child has a fever, parents should closely monitor temperature changes and administer antipyretic medication promptly if the temperature exceeds 38.5°C.

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Which areas should be massaged to reduce fever in children?

Fever, also known as pyrexia, can be accompanied by massage therapy to assist in reducing body temperature in children. However, the appropriateness of massage should be considered based on individual circumstances. Commonly used acupoints for fever reduction include clearing the heavenly river water (Qing Tian He Shui), pushing the Kan Palace (Tui Kan Gong), rubbing the Taiyang point, clearing the lung meridian (Qing Fei Jing), and pressing and rubbing the Hegu point. Proper techniques may help alleviate symptoms of fever. If there are any concerns, it is recommended to seek medical advice in advance.

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How to handle a child's fever of 38°C

In general, a child's fever of 38°C may be caused by factors such as high environmental temperature leading to insufficient heat dissipation, increased body heat production after vigorous activity, acute upper respiratory tract infection, infantile emergency rash (roseola), acute gastroenteritis, and other reasons. It is recommended to seek timely medical attention, identify the underlying cause, and then improve the condition through general treatment, medication, or other approaches under the guidance of a physician.