RVC/FAO guide to Veterinary Parasitology
Faecal samples: Procedure step 3
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As soon as the faecal samples arrive at the laboratory they should be stored in a refrigerator at 4°C until they are processed.

Samples can be kept in the refrigerator for up to three weeks without significant changes in the egg count and egg morphology.


Warning!!!
Samples should not be kept in the freezer.

 

The faeces can now be processed using the following techniques:

Faecal smear

McMaster

Flotation

Larval culture

Baermann


If it is not possible to store the samples in a refrigerator for some time after collection, formalin can be added to the faeces to preserve the eggs. The final concentration of formaldehyde in the mixture should be at least 3% (for example by mixing 1 ml of concentrated formalin with every 10 mls of faeces).


Warning!!!
Formalin fixed faeces cannot be used for faecal culture.


Health and Safety

Formalin is irritant and toxic: use with care in a well ventilated space and avoid inhaling fumes. Local Health and Safety regulations should be observed.

 

The faeces can now be processed using the following techniques:

Faecal smear

McMaster

Flotation

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