Blood results from two countries can look very different without proving that your health has changed. The test name, unit, laboratory method and reference range all matter. Bring the full original reports to a clinical review rather than comparing a highlighted number with a range found online. A clinician can decide whether the results can be interpreted together and whether a repeat test would answer a useful question. [1]
Enquire about a private GP review. Tell the team that your reports were produced overseas and what you want the review to help you decide. Confirm the appointment format, fee and records needed before booking.
Why a familiar test can have an unfamiliar number
A laboratory result is more than its largest number. It should identify what was measured, the result, the unit and the range used by that laboratory. Different laboratories may use different methods and ranges. A number copied into a message without those details can be misleading. MedlinePlus advises checking the range printed on the report and, when following trends, trying to use the same laboratory. [1]
This does not mean overseas results should be discarded. They can be valuable parts of your history. It means that a comparison needs clinical judgement rather than two numbers placed side by side. A flag on one report and no flag on another is not, by itself, evidence that a condition has appeared or disappeared.
What to bring to the appointment
Prepare a small, ordered set of records:
- The complete original reports, including units and reference ranges, not only the abnormal lines.
- Collection dates and, if recorded, the time of sampling and fasting instructions.
- The reason each test was requested and any symptoms present at the time.
- Current medicines, vitamins and supplements, with recent changes.
- Earlier reports that show the history, plus any clinician's explanation or treatment plan.
Keep the original alongside any translation. Tell the team if a translation is informal or incomplete. Do not alter a report to make the units look like those used in the UK. An annotated personal summary may help organise the consultation, but it should not replace the source document. [1,2]
Should you convert the units yourself?
Avoid making treatment decisions from an online converter. Even a correct mathematical conversion does not establish that two tests used equivalent methods or measured exactly the same thing. Ask the clinician to check the identity of the test and the reporting context before interpreting a change. This is particularly important when results affect an ongoing medicine or a specialist treatment decision. [1,2]
A practical question is: "Can these results be compared, or would a repeat with one laboratory change the plan?" That keeps the consultation focused on a decision rather than on producing a new panel simply because the earlier one came from another country.
Does an abnormal flag mean you need treatment?
Not necessarily. Results outside a reference range can occur in healthy people, while a result inside the range does not rule out every cause of symptoms. The clinician considers the history, examination and other relevant findings. Preparation, exercise, medicines and supplements can affect some results. Explain what was happening when the sample was taken rather than assuming that every flag represents disease. [1]
Do not stop prescribed treatment or start high-dose supplements to correct a highlighted result without advice. If the laboratory or treating clinician has told you a result needs urgent action, follow that instruction. Do not postpone an urgent assessment while arranging a private comparison review.
What should the review leave you with?
Ask which findings matter now, which can be monitored, and who is responsible for the next step. If another test is proposed, ask what question it answers and whether timing or preparation affects its usefulness. If no repeat is needed, ask how the earlier result will be documented so the same uncertainty does not return at your next appointment. [1,2]
For people moving between cities, a concise clinical summary can be more useful than repeatedly buying broad panels. Agree how the report and plan can be shared securely with your usual doctor, with appropriate consent. A UK appointment does not automatically transfer responsibility for care overseas or confirm that a UK prescription can be dispensed there. [2,3]
Arranging a review in London or remotely
Contact The Online GP about the appropriate appointment. Give your current location, the dates of the reports and the concern you want addressed. Ask whether the records can be reviewed in the proposed format and whether an examination is likely to be needed. No particular test, prescription or diagnosis is guaranteed.