Can a blood test detect a tumor or cancer?

(1) Doctors examine patients' eyes and hands, which is the most basic and important examination.

(2) Imaging examination

X-ray examination: different parts of the human body are examined by using different penetration effects of X-rays on human tissues and photographic effects on fluorescent screens and photographic films. There are two kinds: perspective and photograph. In order to record and observe the development or cure of the disease, it is convenient to compare before and after, and the photos are better. There are many different parts, different postures and different photography techniques in the photo.

B-ultrasound examination: Ultrasound can echo the viscera in different degrees due to different densities, and can show the location, size and shape of some visceral tumors.

CT and MRI: CT Chinese is computed tomography, MRI Chinese is magnetic resonance imaging. These two examinations can clearly see the location, size, shape and some determinable properties of the tumor according to various tomographic phases in different parts. MRI can also show the functional changes of some parts of the human body, which has a good contrast with human soft tissue and shows clearly.

Radionuclide examination: also known as radiopharmaceutical imaging. A certain amount of isotopically labeled drugs are introduced into the human body. After a certain period of time, radioactive drugs can be selectively concentrated in an organ or tumor lesion area, and the distribution of radioactivity can be displayed in vitro through imaging equipment to assist in diagnosis and judgment of whether there is a lesion.

(3) Laboratory examination: using various instruments and techniques to examine human blood, urine, feces, pleural effusion, ascites and cerebrospinal fluid. These include biochemical examination, immune examination, bacterial examination, etc.

(4) Endoscopy: All kinds of speculums are made of flexible optical fibers, which can be used to check the internal organs or gaps with cavities in the human body, and to see the disease and take biopsy for pathological examination. Commonly used are esophagoscope, gastroscope, duodenoscope, colonoscope, rectal endoscope, nasopharyngeal endoscope, bronchoscope, laparoscopy, cystoscope and hysteroscopy.

(5) Cytological examination: Take out exfoliated cells on the surface of some organs with some relatively simple instruments and techniques, or take out some cells with empty needle puncture technology, and observe the morphology of cells under a microscope through smear, staining and other steps to check whether there are malignant tumor cells.

(6) Pathological diagnosis: take some human tissues or gross specimens that have been surgically removed, send them to the pathology department for multiple treatments, slice the tissues, dye them, treat them with some special techniques, and observe the changes of cell morphology, cell structure, cell tissue arrangement and chemical composition with optical microscope and electron microscope to diagnose whether there is a tumor, its early and late stages, its malignant degree and how many metastatic cancers there are.

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People around the age of 20 suffer from hematologic cancer more because there are many decorations at home.