Two applicants of the same age can be quoted very different prices for identical cover. The difference comes from the rate class assigned during underwriting rather than from the cover itself.
Classes are pricing buckets, not verdicts
Insurers sort applicants into a handful of classes, typically running from a top preferred category down through standard and into substandard ratings.
Each class carries its own rate table, and moving one class changes the premium substantially, which is why the sorting matters more than any single test result.
The advertised figure a shopper sees almost always assumes the top class, which relatively few applicants are ultimately assigned.
The final offer therefore arrives weeks after the application, and it can differ substantially from the number that prompted the application in the first place.
The inputs are health, behaviour and family history
Underwriters look at build, blood pressure, cholesterol ratios, blood and urine markers, and prescription history drawn from industry databases.
Behavioural factors carry weight of their own, including nicotine use in any form, driving record, and hazardous occupations or hobbies such as diving or private flying.
Family history of early cardiovascular disease or cancer can move a class even where the applicant's own results are entirely clean.
Thresholds are stepped rather than continuous
Class criteria are written as cut-offs. A blood pressure reading or a build measurement either falls inside a band or it does not.
A small difference on one side of a threshold can therefore change the price far more than the underlying health difference would suggest.
Because each insurer sets its own thresholds, the same applicant can be preferred at one company and standard at the next.
An applicant sitting close to a boundary on any measure has more to gain from applying through a broker who knows where the boundaries fall.
Nicotine is treated as its own category
Nicotine use generally places an applicant in a separate rate structure rather than simply lowering the class within the standard one.
Insurers differ considerably in how they treat occasional cigar use, replacement products and vaping, and those definitions sit in the application wording.
Testing detects the substance rather than the intent, so the declaration and the laboratory result need to agree.
A rating is not necessarily permanent
Many insurers will reconsider a class after a period if the underlying issue has improved, through a reconsideration request supported by fresh evidence.
Substandard ratings applied for a temporary condition often carry a stated review point written into the original offer.
Applicants who accept a rating without asking whether reconsideration is available frequently keep paying for a condition that has since resolved.