In the hospital, how do doctors test the health of patients' internal organs?

Zang-fu organs are divided into heart, liver, spleen, stomach, kidney and intestine. And the detection means basically rely on instruments. For example, ECG is a basic examination, and normal ECG represents normal heart function. If the electrocardiogram is not normal enough to judge the condition, it can be further diagnosed by color Doppler echocardiography and pericardiocentesis. Another example: liver-liver function and viral infection (hepatitis B, etc. ) all pass blood tests, as well as morphology and space occupation (tumors, stones, unobstructed bile ducts, etc. ) are all detected by B-ultrasound (color ultrasound). ...