I think it's possible cause of death isn't known, yet. Unless there were obvious physical signs on the body, which are very unlikely. I guess they might have a sense of how long since she'd passed, and possibly some clues if, for eg, there was evidence of a substance in the car. But I suspect they'll have to run many tests.
This UK, very basic..
Although some information can be obtained from looking directly at organs in a post-mortem examination, often the only way to understand properly what has happened is:
- to look at part of an organ under the microscope
- carry out special tests
- get a second medical opinion
Tissue samples, blocks and slides
It is usually necessary to retain small tissue samples for further examination and for further tests such as looking at chromosomes or genes and searching for infections due to bacteria or viruses that may have caused the death.
Small samples of tissue are removed from the organs and placed in small plastic containers. The samples measure around 1.5 x 1.5 cm (smaller than a postage stamp) and are up to 5 millimetres thick.
The tissue is chemically treated to remove water, which is replaced with wax. This process creates tissue blocks. Very thin slices (sections) a tenth of the thickness of a human hair are then cut from the surface.
The sections are placed on glass slides so that they can be examined under a microscope. More than one slide can be cut from each block.
These techniques are the same as those used to examine tissue from living patients.
The tissue blocks and slides are stored in special cabinets as part of the medical pathology records and in line with the Human Tissue Act 2004.
The process of creating tissue blocks and slides may create very small amounts of unused or residual tissue. This is usually disposed of by incineration.
Occasionally it is necessary to retain whole organs for further examination, as this can provide more detailed understanding of the cause of death.
The next of kin will always be advised if any tissue samples or organs are retained for further tests.
X-rays, photographs and other images
It may be necessary to x-ray or photograph the body or an organ during the post-mortem examination. These images form part of the record of investigation of the death. They are usually retained indefinitely. Their use is strictly controlled and always confidential.
Post-mortem results
The pathologist will provide the preliminary results of the post-mortem examination to the Coroner very quickly. However, a final written report may not be available for some time as further tests may need to be carried out and these can take time to complete.
The Coroner’s Liaison Officer will contact the family as soon as the preliminary results are available and will advise the family on the finding. They will also be able to say if any organs or tissue have been retained following the post-mortem examination.
Coroners, post-mortems and inquests | nidirect
Regulations and procedures differ internationally, quite a lot. Will try finding better info.