'medium or high' is correct and can be used in written English.
For example, you might write: "Please indicate whether you prefer the temperature to be set on medium or high".
Nearly 9 of 10 doctors had "medium" or "high" awareness of the drug, the survey found.
For an indoor setting, a fan on medium or high speed should do the job.
Is the quality low, medium or high?
The frozen car area may have a low, medium, or high network density in this simulation.
However, this technique alone cannot estimate medium or high CFO values accurately.
Similar patterns are observed when the studied item's difficulty is medium or high.
This provides a rating of either Low, Medium or High risk of bias.
For example, based on past data prices may be classified as low, medium, or high.
hQualification of the degree of agreement: summary terms: low, medium or high [29].
Hydro-cyclones are undergoing a transformation from low to medium or high technology.
Melanin affinity of compounds can be quickly assigned as low, medium, or high melanin binders.
