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 CHEMICAL CHARACTERISTICS
If it is a question of an infectious process, the finds that would be obtained, compared with a normal LCR, they would be different according to the infection be of bacterial, viral cause, for fungi, or for tuberculosis. It is possible to see a table orientativa next:
| CAUSE |
CELLS |
PROTEINS |
GLUCOSE |
COLOURINGS |
CULTIVATION |
| Viral |
< 100 |
TO |
N or B |
denials |
negative |
| Bacterial |
> 200 |
TO |
B |
gram + |
positive |
| Micosis |
> 100 |
TO |
B |
Stained China + |
positive |
| Tuberculosis |
> 100 |
TO |
N or B |
print |
positive |
N = normal, B = fall, A = increased,
Colourings and cultivation not always obtain positives, frequently the neurologist must face his therapeutics based on the clinic, time of evolution, age of the patient, environment and certain information of the spinal liquid.
IF THERE IS INFECTION...
When an infection is suspected, there are another two processes to be carried out on the LCR:
- to do a special, so called coloring "of Gram", to realize an initial distinction of the germ, since in general they are or "positives to the Gram" or "negatives to the Gram", which supposes a valuable information about the most suitable antibiotics in the beginning.
- to do a so called coloring "acidic resistant alcohol", special to detect micobacterias and more specifically the bacillus of Koch, causer of the tuberculosis.
- to do a coloring with Chinese ink, which positividad contributes also important information for the doctor at the time of selecting the treatment.
And the rest of the sample is sowed for his cultivation, with which after certain time it becomes possible to play in tune more and to go so far as to know not the group, but the concrete germ of which it is a question. The growth in the cultivation is observed every 24 hours.
WHAT IS A CULTIVATION OF LCR?
A cultivation, in Medicine, is simply what his name indicates: a sowing in a suitable way that is known commonly as "a culture medium" to see if some microorganism grows. It happens that usually the number of gérmenes that exists in a sample extracted from the organism, in case of they are, is scarce, and this does that it is difficult to see them in the microscope. That's why, what is done is to put the sample in a suitable environment, with sufficient nutrients so that the gérmenes could grow, good temperature, and it is left incubating a variable time. Later, one proceeds to the reading in the microscope. Normally, if there is gérmenes they usually and give grow a positive result; nevertheless, sometimes although they exist gérmenes, the result is negative. This is due to the fact that some of them are extremely sensitive and die as soon as they go out of the organism, therefore for when one proceeds to the sowing in laboratory it is already late and does not grow at all. In other occasions, the result takes a long time in an important way. This happens because all the microbes do not grow with the same speed, by what, as a certain number of them is needed so that the positive is detected, they can be needed sometimes up to several weeks to obtain a result. Nevertheless, the habitual thing is that it is obtained in less than fifteen days, normally in one week. The culture medium is not only. Different several exist according to the group of gérmenes about which we speak. The LCR cultivation consists of sowing in one or several his cultivation means, according to the germ that is suspected. With him, what is claimed is to identify the causative infections microorganisms in the central nervous system.
FOR WHAT MORE IS IT POSSIBLE TO LOOK IN THE LCR?
Other cells and other substances that they face towards different processes:
- malignant cells of diverse nature that suggest some type of cancer of the SNC
- proteins typical of certain illnesses
- and others...
TO SEE ALSO
WHAT DOCTOR CAN TREAT ME?
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CHARACTERISTICS 
