Lab results
Which lab results should I bring to a dietitian?
Bring whatever your doctor has already ordered, ideally from the past year. The most useful are A1c and fasting glucose, a lipid panel, liver enzymes, thyroid tests, vitamin D, B12, iron studies and kidney function. You do not need new tests before a first visit.
Clinically reviewed by Dr. Ambily Kushal, RD, MS, PhD · Published · Last reviewed
Which results help most?
Results that touch blood sugar, fats, organs that handle food, and nutrient levels. Bring any of these you have, and do not worry if the list is partial.
- A1c and fasting glucose, which show blood sugar patterns.
- A lipid panel: total cholesterol, LDL, HDL and triglycerides.
- Liver enzymes, which matter for fatty liver and alcohol questions.
- Thyroid tests, such as TSH, since thyroid function affects energy and weight.
- Vitamin D and vitamin B12 levels.
- Iron studies, including ferritin.
- Kidney function, which shapes protein and fluid advice.
What does a dietitian learn from each?
Each group points to a different part of your eating plan. Together they show which changes are most worth making first.
Blood sugar results guide how carbohydrates, protein and fiber are spread across your day. Anemia and some kidney or liver conditions can make A1c less accurate, so your doctor may use other tests. A lipid panel guides the kinds of fat and fiber in your meals. Liver and kidney results shape how a plan is built around those organs.
Thyroid, iron, vitamin D and B12 results help explain tiredness and can point to foods worth adding. If a level looks low, your dietitian looks at why it may be low and, if a supplement makes sense, reviews it with your doctor.
What if I have no recent labs?
Come anyway. A dietitian can start with your history, symptoms and routine, then suggest tests to ask your doctor about.
Ordering is up to your doctor. Your dietitian can write down which results would help and why, so your next appointment is short and focused.
Do not order a long list of tests on your own because you read about them online. More tests are not always better, and results without context can cause worry.
How should I bring my results?
A patient portal download, a PDF or a clear photo of each page works. Include the date and the lab reference ranges printed on the report.
Add a list of your medicines and any supplements for your dietitian, and note your diagnoses. If you have older results, bring one or two for comparison, since trends tell more than a single number.
Share your files before a first visit ($140, self-pay) so the hour goes to planning.
What patients say about this kind of care
One patient left a first visit with an action plan, additional lab work and a follow-up in 6 weeks.
“recommended a great action plan, additional lab work, and follow-up in 6 weeks.”
One patient valued having their nutritional needs explained and broken down so they could understand them.
“She explained everything and broke it down so I could understand my nutritional needs.”
One patient described a first visit in which the dietitian took time to get to know them and explained the next steps.
“She took the time to get to know me and explained next steps.”
Excerpts from patient reviews of Dr. Ambily Kushal, quoted word for word. Each describes one person’s care; individual experiences vary and are not a promise of results.
Frequently asked questions
Do I need to fast before my visit?
No. A visit with a dietitian is a conversation. If your doctor orders a test that needs fasting, follow their instructions for the blood draw.
How recent should my labs be?
Within the past year is a good guide, and newer is better if your health has changed. Older results still help as a comparison.
Can a dietitian tell me what my results mean?
A dietitian explains what results mean for your eating. Diagnosis and treatment decisions stay with your doctor.
Can I take a vitamin if my level looks low?
Talk with your doctor or pharmacist first. A low level has several possible causes, and a supplement can interact with medicines, so your care team decides what is right for you.
What if my results are in a different lab portal?
Download them or take photos. A dietitian can read results from any lab as long as the report shows the reference ranges.
Sources
- How to Understand Your Lab Results (MedlinePlus (National Library of Medicine))
- The A1C Test & Diabetes (National Institute of Diabetes and Digestive and Kidney Diseases)
- Cholesterol Levels (MedlinePlus (National Library of Medicine))
- Vitamin D: Fact Sheet for Consumers (NIH Office of Dietary Supplements)
Related reading
Our condition guides are general education, not medical advice. Talk with your doctor about your own diagnosis, tests and medicines.