How can a medical examiner tell if a wound was left before or after death?

Blood flows before death, and after death it is slowly deposited in lower areas.

Look at the distribution and color of the outgoing blood.

The wound inflicted before death is dark red in color, and there are scattered blood around the wound.

After death, the wound is relatively clean, and the flesh is not very valgus.

Why do you ask this ? Do you want to deal with it after killing someone? Huh

I think that the blood before death is bright red, and after death it is that dark red.

The blood from the wound left after death does not clot.

Most of them can be judged (near and postmortem injuries are difficult to distinguish between and have headaches), and those with obvious life reactions can be judged (such as scabs, redness and swelling, purulent infection, etc.). It is also a basic skill to cut a piece with a knife to see if there is subcutaneous bleeding (there was a subcutaneous hemorrhage before death), and to cut a piece for microscopic examination (whether it is forensic or clinical diagnosis is the gold standard).

I'm sorry... I just know some clinical stuff... It's not very clear that it involves medical laws and regulations!

This is a big problem.

I think it's better to trust the local forensic doctor.

Don't put too much faith in what is good online.

In general, antemorta injuries often involve wound valgus, granulation tissue proliferation is more common, and pathology may include leukocyte infiltration. After death, the wound was relatively neat, and the pathology did not change above.

There is a wound before death, and the wound does not heal after death. Because all kinds of functions have been discontinued.

It won't heal, all the cells are already dead, and they won't grow well.

About death: There is brain death and cardiac death where the heart stops beating.

In the case of brain death, the wound can be healed. It can be healed if it is brain death.

Haha, what is healing when people are dead?

However, but, but, but, if the wound really heals after death, then if it is true, then there is only one reason - that person is not dead! Ha ha.

If buried in a piece of good soil it is possible to heal

It's not up to the level, it's dead, it's dead, and you're not in forensic science, it's your business.

If you want to learn about this, study Forensic Science.

Forensic science should pay attention to the "cause of death".

The injury suffered by a person while alive will turn to both sides because of the contractility of the surrounding muscles.

If it is stabbed after death, the periphery of the wound will not be turned outward.

See if there is a "life reaction".

Life response refers to the reaction of living organisms to damage caused by various external factors. Common life reactions are: bleeding, embolism, inflammation, wound healing, inhalation, absorption, etc

There is no stress response to the wound after death. It's easy for experienced people to see.

Trauma after death does not bleed because the heart stops beating and the blood is transfused.

The answer to the knife wound you raised is as follows: 1. The injured person should bring the power of attorney of the entrusting unit (otherwise the forensic doctor will not accept it) and medical records to the laboratory; 2. Generally, some brief facts of the case will be asked; 3. Take a photo (half-length photo) and take a detailed photo of the wound (plus a ruler); 4. Measure the length of the wound (not the length of the suture but also the total length, specifically the length between the two, closer to the length of the suture; Because both sides of the wound are superficial, it is not considered a "wound", so a few millimeters are generally deducted.

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It is possible to detect what kind of blunt force injury it is.

Using tool marks to determine the type of tool is one of the important contents of forensic identification. Characteristic wounds can be used to infer the type and approximate shape of the tool. Tools are divided into blunt weapons, sharp weapons, and firearms; Blunt tools are divided into metal blunt tools, wooden blunt tools, masonry blunt tools, etc.; Sharps are divided into single-edged, double-edged, scissors, triangular scrapers, etc.; Firearms are divided into guns and explosives.

In conclusion, the more experienced the forensic inference tool, the more accurate it is.

As for injuries caused by the same sharp object, it is sometimes difficult to distinguish between several or several of the same species, and even experienced forensic doctors are not absolutely sure.