https://books.google.co.uk/books?isbn=9400758278
James A. Radosevich - 2013 - ‎Medical
Since this method requires about one million cells, two FNA passes (two courses ... Using this method, numerous cells can be analyzed for the coexpression of two or ... structural abnormalities of chromosomes in cytological preparations where, conveniently, the cells are already disaggregated in a single layer on the slide.

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iopscience.iop.org/article/10.1088/1742-6596/784/1/012004/pdf
by AN Pronichev - ‎2017 - ‎Related articles
verification of diagnosis and at the same time it is one of the least automated and ... of cytological preparations using conventional single layer scanning method.

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My version may cover both meanings cited above

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campus.cerimes.fr/anatomie-pathologique/.../anapath.../1_2.html
Translate this page
31 May 2014 - L'étalement en monocouche consiste à recueillir les cellules dans un ... sur une préparation histologique ou cytologique grâce à ses propriétés ...

If more context dictates which method is being used, you can then clarify in the translation:)

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CSM Graf - jeudi, 7. mars 2019
Druckversion der Seite: Avantages
URL: www.csmgraf.ch/fr/anwendungen/vorteile/
Avantages de l’utilisation de la Cyto-Spatule Szalay
Le Test Pap classique à la Cyto-Spatule Szalay garantit :

Une préparation monocouche exploitable sans technique supplémentaire ni procédé fastidieux.
Une utilisation rapide et très rationnelle.
Un rapport prix/prestation imbattable.
Une sensibilité et une spécificité élevées.

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szalay cyto-spatula - Pap test device, cervical cancer screening and ...
www.csmgraf.com/pdf/AdvantagesE.PDF
When the cells are smeared correctly onto the slide, they arrange themselves in a single layer (monolayer). ... A smear taken with the Szalay spatula provides highly reliable results for both conventional (Papanicolaou) and liquid-based (Cell Suspension Based Cytologic) methods of analysis.

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Hey, look

you can also use "monolayer preparations"

https://www.nice.org.uk/.../assessment-report-liquidbased-cy...
Modelling the health economic impact of liquid-based cytology within the UK 33. 6. ...... Many studies were found reporting that monolayer preparation slightly.