What is the Normal Range of Blood Concentration?

There is no such term as "blood concentration" in blood tests. Blood tests typically involve blood routine examination, focusing on white blood cells, red blood cells, platelets, hemoglobin, and other parameters. Additionally, blood tests also measure concentrations of carbon dioxide and sodium in the blood. Many diseases require blood-related tests, which can reveal whether white blood cell counts are elevated or if there is bacterial infection. Let's briefly delve into this aspect.

There is no concept of "blood concentration" itself. It mainly depends on the specific parameters being monitored. For routine blood tests, the main observations are white blood cells, red blood cells, hemoglobin, platelets, and other items. If hemoglobin levels are elevated, it does not necessarily indicate an issue with blood concentration. The extent of the elevation, along with age and whether it is physiological or pathological, needs to be considered.

The normal range for blood carbon dioxide concentration is 23-31mmol/L, with an average of 27mmol/L. This is expressed as the carbon dioxide combining power, which measures the amount of carbon dioxide in the plasma after the venous blood sample is separated and equilibrated with normal alveolar air at room temperature. It represents the total amount of carbon dioxide from bicarbonate and carbonic acid, thus being influenced by both metabolic and respiratory factors. Therefore, carbon dioxide combining power alone cannot determine whether it is acidosis or alkalosis. It primarily reflects the bound state of carbon dioxide in the plasma, indicating the body's alkaline reserve. Decreased carbon dioxide combining power is commonly seen in metabolic acidosis and respiratory alkalosis, while increased carbon dioxide combining power can be observed in respiratory acidosis and metabolic alkalosis.

The normal range for blood sodium concentration is between 135-155mmol/L. Levels below 135mmol/L are considered hyponatremia, while levels above 155mmol/L are hypernatremia. Severe hyponatremia can lead to consciousness disorders or epileptic seizures, while hypernatremia can manifest as lethargy, convulsions, and other symptoms. Regardless of whether blood sodium levels are too high or too low, it is recommended to seek medical advice and treatment.