Check abstract length against journal limits.
Abstract limits are hard caps enforced by submission systems, commonly 250 or 300 words, and going over means truncation at the worst possible place. For a structured abstract the per-section budget is the number that actually helps: 250 words across Background, Objective, Methods, Results and Conclusion is only about 50 words each, which is one or two sentences per section and explains why structured abstracts read so tersely. Being well under the limit is also a mistake worth flagging, because the abstract is by far the most-read part of any paper and often the only part a reader sees before deciding.
Per-section budget
Structured: words per section = journal limit / number of sections
Utilisation
Utilisation % = abstract words / journal limit x 100
Because the arithmetic forces it. A 250-word limit across five labelled sections leaves about 50 words each — one or two sentences. That constraint is deliberate: it requires each element of the study to be stated in its most compressed defensible form.
Usually. The abstract is indexed, appears in search results and is the only part most readers see. An abstract at 60 percent of the allowance is leaving out results or context that would help a reader decide the paper is relevant to them.