The Number Your Doctor Isn’t Checking

My doctor called on a Tuesday. Never a good sign.

He said my cholesterol panel looked “fine.” LDL was in range. HDL was solid. Triglycerides were normal. He used the word “unremarkable.”

Then I asked him to run a test he hadn’t ordered. Something a cardiologist friend told me about over drinks. My doctor shrugged and said sure.

That test came back high. Not a little high. High enough that my doctor stopped using the word “unremarkable” and started using the word “aggressive.”

The test was called ApoB. I’d never heard of it. Now I think about it every time I get blood drawn.

Here are four blood tests your annual physical almost certainly skips—and why you should ask for them anyway.

ApoB (Apolipoprotein B).

Your standard lipid panel measures how much cholesterol is inside your LDL particles. ApoB counts the particles themselves. Why does that matter? Because it’s the particles that get stuck in your artery walls. Not the cholesterol riding inside them.

Think of it this way. LDL tells you how much cargo is on the highway. ApoB tells you how many trucks are out there. More trucks, more crashes. Simple as that.

Up to one in six people have normal LDL but high ApoB. Their standard panel says they’re fine. They’re not fine. They’re carrying more risk than they know.

The new 2026 ACC/AHA guidelines—published in March—now formally recommend ApoB testing to catch exactly this kind of hidden risk. That’s a big shift. For years, most doctors only checked it if you pushed.

What to ask for: ApoB level. You want it below 90 mg/dL. Below 80 if you’re higher risk. Simple blood draw, no fasting needed.

Lp(a) — pronounced “L-P-little-a.”

This one is genetic. You’re born with it. Diet and exercise won’t change it. Statins won’t lower it. And about one in five people has a level high enough to double their risk of heart attack.

Most doctors have never tested you for it. Until this year, no U.S. guideline told them to.

That changed in March 2026. The new ACC/AHA guideline now gives Lp(a) a Class I recommendation—the highest level—for universal screening. That means every adult should be tested at least once. It’s inherited, so if yours is high, your kids should know too.

You want it below 125 nmol/L. If it’s above that, your doctor can adjust your other risk factors more aggressively to compensate. There are also new drugs in the pipeline aimed at lowering Lp(a) directly.

What to ask for: Lp(a) level. One blood draw. One time. It doesn’t change, so you don’t need to repeat it.

hs-CRP (high-sensitivity C-reactive protein).

This one measures inflammation. Not the kind you feel—not a sore knee or a swollen ankle. The kind that sits silently inside your arteries, building plaque you can’t see and can’t feel.

A UK study of nearly 450,000 people found that elevated hs-CRP predicted heart attacks and strokes even when cholesterol was normal. The American Heart Association now calls it a risk-enhancing factor for heart disease.

The scale is simple. Below 1.0 mg/L is low risk. Between 1.0 and 3.0 is moderate. Above 3.0 is high. If yours is above 3.0 and you don’t have a cold or an injury, that’s a conversation worth having with your doctor.

What to ask for: hs-CRP. Note the “hs”—that’s the high-sensitivity version. Regular CRP is a different, less useful test. Should be checked twice, two weeks apart, to confirm the reading.

Fasting insulin.

Your annual physical checks fasting glucose. That tells you where your blood sugar is right now. But glucose is a late signal. By the time your glucose is high, the engine has been breaking down for years.

Fasting insulin is the early signal. It tells you how hard your body is working to keep glucose in range. If your insulin is creeping up—even while your glucose still looks normal—your body is already fighting. It’s called insulin resistance, and it’s the road to type 2 diabetes, heart disease, and a list of problems you don’t want.

Most doctors don’t order it unless you’re already diabetic. That’s like checking for smoke after the house is on fire.

What to ask for: Fasting insulin level. You want it below 10 µIU/mL. Ideally below 7. Requires a twelve-hour fast. If it comes back high, the fix is usually the boring stuff—less sugar, more movement, better sleep. But you can’t fix what you don’t know about.

I’m not a doctor. I don’t play one in a newsletter. But I am a guy who got a phone call on a Tuesday that rattled me enough to start paying closer attention.

The standard annual physical was built for a different time. It catches the obvious stuff. High blood sugar. High cholesterol. High blood pressure. Good. You should keep getting it.

But it misses the quiet stuff. The particle count that’s too high. The genetic marker nobody checked. The inflammation running in the background. The insulin your body is burning through to keep a number looking normal.

Four tests. One blood draw. A conversation with your doctor.

That cardiologist friend I mentioned? He’s the reason I caught my ApoB. I asked him once why he thought most guys didn’t know about these tests. He said something I haven’t forgotten.

“Because nobody told them. And nobody told them because nobody asked.”

Ask.

— Walter