Your Keto Bloodwork Came Back “Bad.” Now What?

You've been feeling great. More energy, clearer head, pants fitting better. Then you get your bloodwork back and your LDL is through the roof. Your doctor calls. Wants to "discuss your results." And suddenly you're questioning everything.

I've been through this. Twice, actually. And I've walked dozens of people through this exact panic. So let me tell you what I wish someone had told me the first time I saw my total cholesterol hit 280.

First: What Actually Changes on Keto

When you switch to a high-fat, low-carb diet, your blood lipid panel is going to shift. That's not a bug. It's your body adapting to a completely different fuel source. Here's what typically happens:

• LDL cholesterol goes up. Sometimes a lot. This is the number that sends doctors reaching for the prescription pad.
• HDL cholesterol goes up. This is the "good" one, and keto tends to raise it significantly.
• Triglycerides drop. Often dramatically. This is one of the clearest markers of metabolic improvement.
• Fasting glucose stabilizes. Less spiking, less crashing.

So your total cholesterol number might look scary. But that single number is doing a terrible job of telling your actual story.

The Number That Actually Matters (and Nobody Orders)

Here's what frustrates me. Standard lipid panels give you total cholesterol, LDL, HDL, and triglycerides. That's it. And most doctors look at the LDL number, compare it to a threshold, and stop thinking.

But LDL isn't one thing. It's a category. You've got large, buoyant LDL particles and small, dense LDL particles. The small dense ones are the ones associated with cardiovascular risk. The large buoyant ones? Research shows they're largely benign.

Keto tends to shift your LDL profile toward those larger particles. So your LDL number goes up, but the composition improves. A standard panel can't see this. You need an advanced lipid panel, sometimes called an NMR LipoProfile or a CardioIQ test, to get the actual particle breakdown.

In my experience, this is the single most important test you can request. And most doctors will order it if you ask.

The Ratio Your Doctor Probably Isn't Calculating

Here's a quick one you can do yourself right now. Pull up your last lab results and divide your triglycerides by your HDL.

Triglycerides ÷ HDL = your ratio.

Here's the honest caveat: there's no single universal cutoff for this one. Research on trig/HDL as a marker of insulin resistance shows the number tied to elevated risk actually shifts depending on the population studied, closer to 3.0 in some groups, closer to 2.0 or 2.5 in others. No major health body has signed off on one "ideal" number that applies to everyone. What the research does support is the direction: lower is generally better, and it's a useful signal to track alongside your other numbers, not a diagnosis you can read on its own. And on keto, where triglycerides tend to drop and HDL tends to rise, this ratio is one more place that direction can show up, though your own numbers are the only ones that actually tell you anything.

I've seen people with an LDL of 210 and a trig/HDL ratio of 0.8. Their doctor wanted them on statins based on the LDL alone. That ratio doesn't erase a 210, but it's exactly the kind of number that gets skipped when LDL is the only thing anyone looks at, and it's worth bringing to that same appointment.

Inflammation Markers Tell the Real Story

If you want the full picture, ask for these alongside your lipid panel:

• hs-CRP (high-sensitivity C-reactive protein): Measures systemic inflammation. The AHA and CDC's joint guidance on inflammation markers treats under 1.0 mg/L as the lower-risk range, 1.0 to 3.0 mg/L as average, and over 3.0 mg/L as higher risk. It's one input into your cardiovascular picture, not a verdict on its own.
• Fasting insulin: Not fasting glucose. Insulin. Your glucose can look normal for years while your insulin is working overtime. There's no agreed-upon "optimal" number here the way there is for HbA1c, reference ranges vary by lab and assay, so this is a test worth running and discussing with your doctor rather than a number to chase to some specific target on your own.
• HbA1c: Your 3-month blood sugar average. The ADA's own guideline puts normal under 5.7%, with 5.7 to 6.4% as prediabetes and 6.5% and up as diabetes.

If your hs-CRP is low, your fasting insulin looks reasonable for your lab's range, your triglycerides are low, and your HDL is high, that's a genuinely good set of signals, regardless of what your total LDL says. But it's a set of signals, not a diagnosis you can hand yourself. Bring the whole picture to your doctor, the person who can actually weigh it against your history, your symptoms, and the rest of your bloodwork.

When You Should Actually Be Concerned

I'm not going to tell you cholesterol doesn't matter. That's not honest and it's not helpful. There are situations where elevated LDL on keto deserves real medical attention:

• Your LDL particle count (LDL-P) is very high on an advanced panel. Not just LDL-C. The particle count.
• Your hs-CRP is elevated alongside high LDL. High cholesterol plus high inflammation is a different conversation.
• You have a family history of early heart disease. Familial hypercholesterolemia is real, and keto can amplify it.
• Your triglycerides went UP on keto. That's unusual and worth investigating.
• You feel worse. I know this sounds basic. But your body gives you signals. Don't ignore them because a forum told you everything is fine.

Actually, let me say that again. If multiple markers are moving in the wrong direction and you don't feel good, please go talk to your doctor. No diet philosophy is worth more than your health.

How to Talk to Your Doctor Without It Going Sideways

Most GPs learned maybe a few hours of nutrition in medical school. They're not dumb. They're just working from a framework that treats LDL as the primary villain. So when your LDL comes back at 240, their training says: prescribe a statin.

Here's what I tell people to do. Don't go in defensive. Don't go in with a stack of PubMed printouts. Instead:

• Ask for the advanced lipid panel. Say: "I'd like to see my particle size and count before we make any decisions. Can we order an NMR LipoProfile?"
• Ask for hs-CRP and fasting insulin. Frame it as wanting the complete picture.
• Acknowledge their concern. "I hear you that the LDL number is high. I want to make sure we're looking at the right metrics to understand my actual risk."
• Give it a timeline. "Can we retest in 3 months with the expanded panel before starting any medication?"

Most reasonable doctors will agree to that. You're not refusing care. You're asking for better data. And honestly? If the advanced panel comes back and your particle count is genuinely concerning, then you and your doctor can make a decision based on real information. That's a win either way.

What I Think (And This Is Just My Opinion)

I think the standard lipid panel is an outdated tool being used to make important decisions. I think triglyceride-to-HDL ratio tells you more than LDL alone ever will. I think most people who panic about their keto bloodwork are healthier than they've ever been, and the numbers just need context.

But I also think blanket statements like "cholesterol is a scam" are dangerous. Some people genuinely need medical intervention. The answer isn't ignoring your doctor. It's getting better tests and having smarter conversations.

Your body is giving you data. Learn to read all of it. Not just the one number that fits a narrative.

If you want to see where you actually stand, you can run your macros in the calculator for free. Some people also pick up the optional Doctor's Report, which spells out the labs worth asking for and a few talking points, so your next appointment turns into a real conversation instead of a rushed one.

Not a Doctor. I've researched this deeply and I've worked with a lot of people on keto, but I'm not your doctor. I can't see your full medical history, your family risk factors, or your complete bloodwork. Everything here is educational based on research and what I've seen work. If you're on medications, have diagnosed conditions, or your doctor is genuinely concerned, please work with them. Get the advanced tests. Make decisions together. Your situation might be different from what I've described here.

If you're tracking your health markers closely, understanding what happens to blood sugar in the first 30 days gives you more context. And if your doctor's reaction has you second-guessing keto entirely, Chloe's piece on why people quit and how to stick with it is worth a read.