Testosterone: what it is and what a test can show
Testosterone is the main male sex hormone. It plays a part in energy, mood, libido, muscle, bone and recovery, and levels can change with age.
A blood test usually measures total testosterone, often alongside SHBG (a protein that binds it) and sometimes free testosterone, LH and FSH. Timing matters. Levels vary through the day and from one day to the next, so samples are normally taken in the morning and a single result is rarely the whole story.
Laboratories publish reference ranges, but where a number sits within one needs reading alongside symptoms, sleep, weight, alcohol, illness and medicines, all of which can influence a result. Dr George does not treat any single level as a target. If a result falls outside the laboratory range, GP review is advised. Any discussion of treatment requires a separate formal consultation.
ApoB: the cardiovascular marker worth understanding
ApoB is a protein found on the particles that carry cholesterol around the blood. Each of those particles carries one ApoB molecule, so the test counts particles rather than measuring how much cholesterol they hold.
Standard LDL cholesterol measures the cholesterol content instead. The two usually move together but can differ, which is why some doctors like to see both. An ApoB test is available in the UK through private laboratories, but it is not part of every standard cholesterol panel. Which markers go into your panel is decided by Dr George for your own context.
It is one piece of cardiovascular risk. Family history, blood pressure, smoking history and other results all sit alongside it.
Metabolic health: glucose, triglycerides and liver markers
Metabolic health describes how well your body handles energy. Doctors look at HbA1c (a measure of average blood sugar over recent months), fasting glucose, triglycerides, liver enzymes and sometimes fasting insulin, alongside waist measurement and body composition.
These markers rarely give a verdict on their own. Their value is in the pattern and in how they change over time, which is why repeat testing is part of the plan.
Why a doctor reading them together matters
Each of these results sits in relation to the others. Weight, sleep and metabolic health can all bear on hormone levels, and cardiovascular markers mean more once you know your blood pressure and family history. A doctor reading them together can decide what matters, what to repeat and what needs GP review.
At Prosper this happens inside Prosper Clarity, with a 60-minute consultation, a written report and a personalised action plan. The steps are on the how it works page, and Prosper works alongside NHS care.
On why the reading matters more than the report, see Blood test results reviewed by a doctor, not an app. Dr George's background is on the about page.
