Blood test results: questions to ask your doctor

Blood test results: how to prepare for your visit, questions to ask your doctor, how to read the lab report, get a copy and track trends over time.

Blood test results: questions to ask your doctor

9 min - BioSense Team - 2025-01-09

  • level:understanding
  • prise de sang
  • médecin
  • consultation
  • compte rendu
  • Mon espace santé

Questions to ask your doctor about blood test results

Patient and doctor discussing blood test results

You get your blood test results, a few values are flagged in bold or red, and the visit to discuss them may be short. Many people leave with an "it's fine" that does not answer their questions, or with a worry that was never properly explained. To talk about a blood test with your doctor, three steps cover the essentials: bring the full report and your previous tests, write your questions in order of priority, and ask what should be done with the result and when. This guide also helps you read a lab report and understand your rights to get a copy of your results in the United States.

Why prepare for a visit about your blood test

Your doctor knows laboratory medicine; you know your body and your history. A blood test only makes full sense when both are brought together: the same number can be trivial in one person and worth rechecking in another, depending on age, medications, symptoms and previous results.

The US Agency for Healthcare Research and Quality (AHRQ) promotes shared decision-making: a conversation in which you and your clinician explore the benefits, harms and risks of the options, and what matters most to you. Its Questions Are the Answer program encourages patients to ask questions at every visit.

What should you bring to discuss a blood test with your doctor?

Before the appointment, gather:

  • the full lab report, not just a screenshot of the abnormal values: reference ranges, units and comments all matter;
  • your previous results, ideally over several years, especially if they come from another lab;
  • a list of your medications, including dietary supplements (biotin, for example, can interfere with some lab tests), birth control or hormone therapy;
  • the conditions of the blood draw: fasting or not, time of day, intense exercise the day before, recent illness, alcohol, dehydration. Our article on preparing for a blood test explains what can change a result;
  • your symptoms, with when they started and how they have changed: fatigue, shortness of breath, sleep problems, changes in your cycle, weight gain or loss;
  • your goal: preventive check-up, follow-up of a known condition, or looking for the cause of a symptom.

Half a page of notes is enough. Write your questions in order of priority: if time runs short, the most important ones will have been asked.

Questions to ask your doctor about your blood test results

Here are ten questions that cover the essentials. There is no need to ask them all: pick the ones that apply to you.

  1. Which results matter for me today, and which have no consequence?
  2. Is this result outside the reference range significant in my case, or is it a meaningless deviation?
  3. Are my "normal" results also satisfactory in light of my prevention goals (cholesterol, blood sugar, blood pressure)?
  4. How has this result changed compared with my previous tests?
  5. Should a value be rechecked, and when?
  6. Could a medication, a supplement or the conditions of the blood draw have influenced this number?
  7. Could this result explain my symptoms? If not, what remains to be explored?
  8. What depends on my lifestyle, and which change would have the greatest effect?
  9. Is an additional test or a specialist opinion needed?
  10. When should I have my next blood test, and which one?

If an answer seems unclear, rephrase it in your own words: "If I understand correctly, I need to…". It is the simplest way to check that you leave with the right information.

Understanding your lab report

Under federal CLIA rules, a US lab report must show the test performed, the report date, the name and address of the lab, and the result with its units or an interpretation. The lab must also make its reference intervals available to the person who ordered the test. You will generally find:

| Item | What it tells you | |---|---| | Test name | The marker measured (for example "TSH" or "ferritin") | | Result and unit | The measured value. US reports usually use mg/dL for glucose and cholesterol, while reports from many other countries use mmol/L | | Reference range | The range covering about 95% of healthy people for this lab and this method | | Flag | Bold, H or L, asterisk, or color for a result outside the range | | Previous results | Your earlier results, when the lab or portal shows them | | Lab comment | A note on interpretation or a suggestion to recheck |

Keep three points in mind. First, being outside the range does not mean being sick: by design, about one healthy person in twenty falls outside the range for each test. Second, being within the range does not guarantee that all is well, because the range describes a population, not your situation, and some prevention goals are stricter. We explain this in why "within the normal range" is not enough. Finally, reference ranges vary from one lab to another: always compare each result with the range printed on its own report.

Your ordering clinician is the first person to ask about what a result means. The lab can often answer practical questions about a test, a unit or a comment. When a result indicates a life-threatening condition or reaches a panic or alert value, CLIA rules require the lab to alert the person or facility that ordered the test immediately.

An abnormal result: how to discuss it without panicking

A single result slightly outside the range is common and often harmless. Before discussing it, note what might have influenced it: recent infection, intense exercise, alcohol the day before, prolonged fasting, a new medication. The right question is not "is it serious?" but "what should be done with this result, and when?".

Your doctor has three possible answers: do nothing because the deviation has no meaning in your context, recheck within a given time, or add further tests. Ask explicitly which one applies, and write down when to recheck. Our article abnormal result: what to do? walks through this approach.

Conversely, if how you feel does not match an "everything is normal", say so. MedlinePlus notes that a normal result is not always a guarantee of good health. Lasting fatigue or symptoms that persist deserve to be explored even with a blood test within range: describe precisely what has changed, since when, and what it stops you from doing.

Tracking the trend in your results rather than a single number

A single value is a snapshot; several values over time make a film. A fasting glucose that rises from 85 to 97 mg/dL (4.7 to 5.4 mmol/L) over five years stays below the American Diabetes Association's prediabetes threshold of 100 mg/dL (5.6 mmol/L), but the trend is worth discussing. Conversely, a slightly low ferritin that has been stable for ten years with no symptoms raises different questions from a rapid drop.

To compare two blood tests reliably:

  • check that the units are the same, and convert if needed;
  • prefer the same lab, as methods differ;
  • take the conditions into account: fasting or not, season, current medication;
  • do not over-interpret a small difference: each test has its own biological and analytical variability.

Our guide to comparing two blood tests explains how to tell a real change from simple fluctuation.

Your rights: how to get a copy of your lab results

In the United States, you generally have a federal right to access your health information:

  • From your doctor or hospital (45 CFR 164.524, part of the federal health privacy rule): a covered provider must act on your request within 30 days, with one possible 30-day extension. It may charge only a reasonable, cost-based fee for copies.
  • From the lab (42 CFR 493.1291): at your request, a lab may give you or your personal representative access to completed test reports, once it has authenticated that the reports are yours. The privacy rule above also applies to labs that are covered by it.
  • Online: many health systems and labs offer portals where results can be viewed and downloaded.

Asking your doctor or lab for a copy of your previous results is therefore legitimate. Keep them in a single folder, paper or digital: this is what makes it possible to track your trends.

Patient portals: seeing your blood test results online

The 21st Century Cures Act and its information blocking rules limit practices that interfere with access to electronic health information. As a result, many people now see lab results online as soon as they are available.

Two practical consequences:

  • You may see a result before discussing it with your doctor. If a number worries you, write down your question for the visit, or send a message through the portal, rather than searching for an explanation on your own. If you feel severely unwell, call 911.
  • Some results may be delayed in specific cases. The rules include exceptions, such as one for preventing harm, which applies only under defined conditions. Portal policies can also differ between health systems. If you do not see a result, ask your doctor's office.

Frequently asked questions

Can I get my lab results without going through my doctor?

Usually, yes. Many labs offer portals, and CLIA rules allow labs to give you your completed reports at your request. For older results held by your doctor or a hospital, you can request a copy from them.

My doctor says everything is normal, but I don't feel well: what should I do?

Describe your symptoms and how they have changed precisely, and ask which causes remain to be explored. A normal blood test rules out some hypotheses, not all of them. A second opinion is always possible.

Should I repeat my blood test at the same lab?

It is better for tracking trends: methods and reference ranges can differ from one lab to another. If you change, compare each value with the range on its own report.

*This article is for information only and does not replace medical advice. For any question about your results, talk to your doctor.*

Import your blood test and get an educational reading of each of your biomarkers, placed in the context of your personal situation. Your data is hosted on servers located in France.

[→ Import my blood test](/en/onboarding/upload)

Sources and methodology

United States

*BioSense methodology: our content is based on guidance from US authorities and medical societies (such as the USPSTF, CDC, NIH, FDA, ACC/AHA and ADA), UK bodies (NICE, NHS), European societies and the WHO. Sources are listed by country, and differences between countries are stated when they matter.*