Laboratory microtomes: how can thin, even histological sections be obtained?

An essential in histopathology and life science laboratories, the microtome delivers thin, uniform and reproducible sections from paraffin-embedded, frozen or resin samples. Whether rotary for FFPE, integrated into a cryostat for intraoperative frozen sections, sliding for large specimens or vibrating (vibratome) for delicate fresh tissues, it underpins the quality of observations in light microscopy, IHC and IF. Mechanical stability, micrometric control of section thickness, blade safety and ergonomics make a real difference day to day.

What are the different types of microtomes, and how do you choose the right one?

The microtome turns a specimen into thin, consistent sections. Depending on the sample and the analytical goal, you would choose a rotary microtome (the standard in FFPE histology), a cryostat (frozen sections for rapid diagnosis), a sliding microtome (large blocks or hard tissues), a vibrating microtome (fresh/fragile tissues) or an ultramicrotome (ultrathin resin sections for EM).

The core of performance is a precise micrometric feed, stable mechanics, anti-vibration systems, end-of-stroke retraction and safety devices (handwheel lock, ejector and blade guard). Blades (disposable steel, resharpenable knives, glass or diamond for ultra) are selected according to the material and the target thickness.

Type	Principle	Typical thicknesses	Applications
Rotary	Incremental feed against a fixed blade	2–10 µm	FFPE, IHC/IF, routine histopathology
Cryostat	Microtome in a refrigerated chamber	5–20 µm	Intraoperative consultation, lipids, non-embedded tissues
Sliding	Fixed specimen, moving blade	5–50 µm	Large specimens, hard tissues (wood, decalcified bone)
Vibrating	Oscillating blade in a buffer bath	50–400 µm	Acute slices, neuroscience, physiology
Ultramicrotome	Ultrafine feed, diamond knife	50–100 nm	Resin, EM/TEM

Key selection criteria:
• Sample type (FFPE, frozen, fresh, resin) and required thickness.
• Throughput and options (motorisation, programmes, section counter).
• Ergonomics (height, supports, handwheel effort).
• Safety (guards, locking, blade handling).
• Accessories (water bath, cold plate, anti-roll plate, ribbon suction).
• Maintenance and consumables availability.

In which fields is a microtome used?

Essential in clinical histopathology, the microtome produces 2–5 µm FFPE sections for IHC, H&E staining and tumour diagnostics. In surgery, the cryostat accelerates intraoperative frozen sectioning and Mohs micrographic surgery. In pharma R&D and toxicology, it supports GLP studies on animal tissues. The vibratome is used in neuroscience (acute cortical slices) and physiology. In agri/wood/plant work, the sliding microtome prepares sections of hard materials. In cosmetics and reconstructed skin, it facilitates the evaluation of actives. In materials, the ultramicrotome enables EM sample preparation and analysis.

Available microtome types

Microtome

Frequently asked questions about microtomes

How do I choose between a rotary microtome, cryostat, sliding microtome, vibrating or ultramicrotome?
Base your choice on sample type (FFPE, frozen, fresh, resin), target thickness, throughput and safety. Rotary for FFPE, cryostat for rapid/frozen work, vibrating for live tissue, ultra for EM.

Which blade should I use to minimise artefacts and extend knife life?
Disposable steel blades for FFPE, hardness matched to fibrous tissues; glass/diamond for ultra; resharpenable knives on sliding models. Replace as soon as sections fray or wrinkle.

How can I set section thickness reproducibly day to day?
Calibrate the micrometric feed, stabilise the specimen, keep a fresh blade and a constant clearance angle; cut at a steady pace and check each ribbon on the water bath.

Which safety precautions are essential during sectioning?
Lock the handwheel when not cutting, use the blade guard and ejector, keep fingers away from the edge, wear dedicated cut-resistant gloves and dispose of blades in approved sharps bins.

How do I limit artefacts (folds, compression, chatter) on FFPE sections?
Optimise paraffin and embedding, adjust the blade angle, choose a stiffer blade if needed, control water-bath temperature and avoid prolonged flotation.

What maintenance is needed to keep precision over the long term?
Daily removal of debris, lubrication per the manual, annual checks of carriage and feed, verification of safety interlocks and preventive replacement of wear parts.