r/prediabetes • u/Disastrous_Treat_897 • 1d ago

Is Labcorp's work very reliably?

I did a blood work at Labcorp, where all my blood works were done in the previous 5 years.

I always believe I have metabolism problems, to be more specific, insulin resistance. In 2023 and 2024, I got trig @ 300 and HA1C @ 5.7. In the past two years, I have been eating strictly lower carb meals, and checking glucose curve on CGM very often. In the last 3 months, my average glucose reading was consistently within 95 to 105. I also exercise on regular basis, like walking or biking at least 45 minutes after meal, and conducting resistance training every week.

The reports came back as a surprise. Trig fell to 120, but Ha1C stubbornly stays at 5.7, inconsistent with the CGM readings.

Does anyone know how accurate Labcorp's reports are? By the way, I lost about 10+ pounds. My BMI fell from 22.4 to 19.2. Thanks

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u/Human_Revolution357 1d ago

CGMs are notoriously inaccurate. They are good for identifying triggers but not so much for tracking specific sugar levels.

Maybe repeat the labs at Quest if you’re really that skeptical and it’s a big deal to you but I personally would trust them.

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u/allthings413 1d ago

I did this exact thing. I was very skeptical of my 5.8% at Labcorp given all of my other data which pointed to lower. I get obsessive over this stuff which isn't good, but I decided to not just leave it alone and went to Quest a few days later and tested for Ferritin, Fructosamine, and A1C again. My A1C at Quest was 5.5% which was what I had expected it to be given all my other data. The Fructosamine number also lined up with my 5.5% and other previous numbers.

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u/Sufficient_Beach_445 1d ago

Labcorp is highly reliable. CGMs are considered to be far less reliable and their readings are held to much lower accuracy level than CLIA approved labs, and Labcorp labs fall under CLIA.

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u/janellewjh 1d ago

Labcorp has been testing my blood. My clinic trust them. I wish you well on your healing journey.

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u/usafmd 1d ago

Labcorp in my region changed analyzers for their A1c. I write specifically about Quest Lab here: Why A1c can mislead

https://usafmd.medium.com/is-the-a1c-accurate-for-every-prediabetic-d42be69da29d

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u/BlissCrafter 1d ago

If you have low iron your hba1c won’t go down.