Low-carb Lab Testing — Part 6 — Thyroid Panel

Low-carb Lab Testing — Part 6 — Thyroid Panel

Thyroid function is a hotly debated topic in the low-carb world. While most people typically experience fat loss, better energy levels, and improved overall vitality on a low-carb diet, in some individuals, measurements of thyroid-related hormones suggest that a low carbohydrate intake might be having adverse effects on the thyroid gland. Is it possible that a way of eating that has such wonderful benefits for so much of the body could be harmful to the thyroid?

This is the fifth installment of a series exploring lab tests for people following low-carb diets. Due to the effects of the low-carb or ketogenic ways of eating on overall metabolism, interpreting certain lab tests requires a slightly different perspective compared to results from people following high-carb diets.

Previous posts have explored blood glucose testing, fasting insulin, and HOMA-IR (and remember: if you’d like to get some tests your doctor isn’t familiar with, or to test more frequently than your insurance will cover, this recent Heads Up Health post will show you how to order your own lab tests).

Keeping track of your numbers is an important step for anyone who wants to transform their health. Heads Up Health was created to empower you to manage all of your health data, including your lab test results, in one secure location. You can learn more on our homepage or by clicking below to create your account and start building your own centralized health portfolio.



Low-carb Lab Testing — Part 6 — Thyroid Panel

Low-carb Lab Testing – Part 5 – A Case Study

We’ve covered a lot in our low-carb lab testing series so far. At this point, we felt it was time for a real-world case study to tie everything together. In this post we will take a look at my own experience ordering fasting glucose and fasting insulin tests, calculating my HOMA-IR score, and tracking results in my Heads Up profile.

Heads Up Health is a web-based product designed to help individuals centrally manage their health data. By giving you powerful tools for self-directed and data-driven care, our product can be your compass on the path to optimal health. You can learn more or create your account by clicking the button below. Or, read on for our case study on Low-carb Lab Testing.


Low-carb lab testing – a case study

As we’ve explored in previous posts, there are many reasons why an individual may see normal blood glucose levels and still be at risk for metabolic issues down the road. One possible reason is that the body is over-compensating with insulin to keep blood sugar within normal ranges. I decided to put this to the test with my own data.

Yes, I regularly check my fasting blood glucose levels at home as part of my low-carb/ketogenic lifestyle. And yes, according to my glucometer, my blood sugar is within healthy ranges. But as we know, relying on just my glucometer (without a corresponding fasting insulin test), doesn’t always tell the full story. I felt it was an ideal opportunity for some self-directed n=1 experimentation. I was curious to see the fasting insulin data and calculate my own HOMA-IR score.

Step 1 – Ordering the tests

Unfortunately, many conventional doctors within the US will not order a fasting insulin test unless they suspect metabolic disease (or you have already been diagnosed with a metabolic disease). This doesn’t do much good for the person who is trying to be proactive. Even if you do successfully sweet-talk your doctor into ordering the tests you want, there are no guarantees your insurance company will cover the cost of the test. Fighting with an insurance company over tests they won’t cover is enough to make a grown man (or woman) cry. I’ve been on the losing end of many such battles and it’s a miserable place to be.

To bypass uncooperative doctors and insurance companies, I personally use request-a-test.com to order my own labs. Request-a-test allows you to choose between LabCorp or Quest Diagnostics for the blood draw. Heads Up Health can electronically connect to Quest Diagnostics so my results will update automatically.

I purchased the fasting insulin test for $49 and the fasting glucose test for $29. The overall cost was not much more than my insurance co-pay if I were to see a doctor.

Ordering your own glucose and insulin tests

Ordering your own glucose and insulin tests

Step 2 – Scheduling the blood draw

I scheduled an appointment with Quest Diagnostics to have the blood draw.

Note: for extra nerd points, I brought my glucometer with me to the lab. I wanted to take a reading with my glucometer at the same time as the laboratory blood draw so I could see how accurate my glucometer was compared to results from a full-blown lab testing company with far more sophisticated technology for analyzing blood samples. Results are covered later in this post.

To check the accuracy of my glucometer, I I took a reading at the same time as my lab draw from Quest.

To check the accuracy of my glucometer, I took a reading at the same time as my lab draw from Quest.

Step 3 – Assessing my test results

Within 24-hours, I received an e-mail notification from request-a-test that my test results were available. Since it had been many years since my last fasting insulin test, I was anxious to see the results:

  • Fasting glucose: 84 mg/dL
  • Fasting insulin: 4.8 µIU/mL

Note: The reading on my glucometer was 88 mg/dL (compared to 84 mg/dL from Quest), which was taken just moments before the blood draw from the lab. Overall, I’d say my trusty old glucometer held up pretty well!

Step 4 – Calculating my HOMA-IR score

With fasting insulin and fasting glucose readings in hand, I was now equipped with the data I needed to calculate my HOMA-IR score to assess my level of insulin resistance.

I used the HOMA-IR calculator located here. After entering my results into the HOMA calculator, my score was 1.0. I was pleased with this result and felt assured that both glucose AND insulin levels were properly in check.

Calculating my HOMA-IR score

Calculating my HOMA-IR score

Step 5 – Tracking my results

Heads Up Health was designed to empower individuals to make informed, data-driven health decisions. Our product gives you the ability to easily track and manage your own lab test results, which can be a powerful tool on your own health journey.

I entered my results for fasting glucose, fasting insulin, and HOMA-IR and saved this data in my Heads Up profile. I also uploaded a copy of the PDF from the lab so I have the source documents for future reference.

Tracking your results with Heads Up

Tracking your results with Heads Up


This post is a simple example that summarizes the topics covered thus far in the Low-carb Lab Testing series. The post demonstrates how anyone can get in the driver’s seat and order their own labs when the need arises.

I was able to order my own fasting glucose and fasting insulin tests without the need for doctor intervention. I was then able to calculate my HOMA-IR score and assess my results. Lastly, I used Heads Up Health to store my results so I have easy access to them for future reference. I can also test again in a year or two and easily compare my results to previous tests.

This is true patient empowerment and something everyone should have access to if they so desire.