Cellular Pathology - Electron Microscopy

Electron Microscopy Service - specific requirements

The Electron Microscope Unit is used routinely at magnifications of between 1500 and 70,000 times to examine the ultrastructure of cells and their surroundings.  The EM unit receives approx. 800 samples a year, the majority of which are renal, but about 100 muscle and 30 nerve biopsies are also collected.  Other specimens include cardiac biopsies, occasional skin biopsies and tumour samples.

Specimens from outside the department requiring EM should be sent in a small sample container (e.g. bijou or Eppendorf tube) containing at least 2 mL of an EM fixative.  A glutaraldehyde based fixative such as 2.5% glutaraldehyde in phosphate buffer is ideal but 10% buffered formalin is also acceptable.  In larger tissue samples individual pieces should be no larger than 3 mm cubed and should be completely submersed in fixative.  The optimal size of diagnostic tissue requiring processing for electron microscopy is as follows: the largest dimension should be no greater than 5mm and the smallest dimension no less than 1mm. Any specimen with the smallest dimension less than 1mm may not survive tissue processing.

For QEHB service users - Renal biopsies are delivered to the Cellular Pathology Specimen Reception and EM samples are taken in the EM Lab. 

For External service users - package specimens for EM in firmly closed leak proof containers, together with sufficient absorbent material to contain any liquid, in sealed bags. The sealed bags are placed securely in a small padded envelope with the address label as given above under key information.  The EM unit makes use of the Histology request form for both internal and external users.   A copy of the light microscopy report is also required.  

Please note that we support the service by outsourcing when required to the specialist EM facility at Leicester Royal Infirmary.  It is fully accredited by United Kingdom Accreditation Services (UKAS) ISO 15189, reference number 8608.

Advice on the service or requirements can be obtained from the EM lead biomedical scientist This email address is being protected from spambots. You need JavaScript enabled to view it. or from the electron microscopy laboratory team on 0121 371 5720.