Your Herpes Test Results Do Not Say What You Think They Say
You got a number back and a word. Nobody explained either one.
Maybe the word was “positive.” Maybe it was “exposed,” which is worse, and I will come to why. Maybe there was a number beside it — 1.4, or 3.9, or 23 — and no indication whether that number was large or small or meant anything at all. Maybe you were told over the phone by someone who sounded like they had somewhere else to be.
So you did what everyone does. You went looking. And what you found was contradictory, frightening, and mostly written by people who have never sat across from a person reading one of these results.
I have been a herpes specialist for twenty-three years. I have carried the virus myself for thirty-six. In that time I have read more of these lab reports than I can count, and I can tell you plainly: the confusion is not your failure to understand. The confusion is built into how these tests are ordered, reported, and explained.
Let me take you through what you are actually holding.
First — were you even tested?
Start here, because a surprising number of people have not been.
Herpes is almost never included in routine sexually transmitted infection screening. You can walk into a clinic, ask to be tested for everything, walk out with a clean panel, and never have been tested for herpes at all. Some doctors take the view that so many people test positive that there is little point in checking. Others simply follow the standard panel, and herpes is not on it.
Unless you specifically asked for a type-specific herpes test, you probably have not had one.
So before anything else, look at the actual report. Does it name HSV-1 and HSV-2 separately? If it does not, you are working from a blank.
The two things a blood test can measure, and only one of them is worth having
Blood tests do not find the virus. They find your immune system’s response to it — antibodies. There are two kinds, and the difference is not a technicality.
IgM is the one to refuse. It cannot tell HSV-1 from HSV-2. It cross-reacts with other viruses in the same family, chickenpox among them. It can come back positive during a recurrence, not only a new infection, which destroys the one thing it is marketed as doing — telling you when you caught it. The rate of false positives is considerable.
The public health guidance has said IgM is not useful for years. What has changed recently is that the laboratories finally listened. Between 2022 and 2025, a wave of major reference and hospital labs — Mayo, and a string of others — formally pulled HSV IgM from their menus and issued client notices explaining why.
If you are holding an IgM result, you are holding something that a growing number of laboratories will no longer perform. Set it aside. If a doctor offers you one, decline it and ask for IgG.
IgG is the useful test. It is type-specific, meaning it distinguishes HSV-1 from HSV-2 by looking for antibodies to a particular protein on each virus. HerpeSelect is the most common version; there are newer automated ones from Abbott and Roche now cleared for use, which work on the same principle.
Here is what IgG cannot do, and this is the single most common misreading I encounter.
It cannot tell you where on your body the virus lives. It tells you which type you carry. Nothing more. A positive HSV-1 does not mean cold sores. A positive HSV-2 does not mean genital. Type and location are two different questions, and the blood test only answers one of them. A great many people are given a genital diagnosis on the strength of a blood test that says nothing whatsoever about anatomy.
The number beside the word
If your report has an index value, that number is doing more work than anyone told you.
The standard reading is: below 0.90 negative, 0.90 to 1.09 equivocal, 1.10 and above positive. What almost nobody explains is that “positive” is not one category. Results in the low band carry a false-positive rate high enough that public health guidance recommends confirmatory testing before anyone treats them as a diagnosis. Values well above that band are considerably more reliable — though not perfectly so, and the peer-reviewed literature has been arguing for several years now that the official cutoff understates how far up the scale false positives reach.
A low positive is not a diagnosis. It is a reason to test again, properly.
I have written about index values in detail — what the bands are, what the confirmation rates look like, and what to do if your number sits in the uncertain range — in a separate article here. If there is a number on your report, read that one next.
If you have a sore right now, the blood test is the wrong test
This is the part I wish someone had told me in 1990.
When I first went to doctors with an obvious primary outbreak, they swabbed me and told me twice that I did not have herpes. Twice. I had a textbook first outbreak and I was sent away with a negative result, because the culture they used could not find what was plainly in front of them.
If you have an active lesion, the right test is a PCR swab, sometimes called NAAT. It looks for the virus itself rather than your antibodies, it can type it, and it is dramatically more sensitive than the old viral culture.
Viral culture is still offered. It should not be. Its sensitivity on recurrent lesions runs somewhere in the region of a quarter to a half, and it falls further as the sore begins to heal — a crusted lesion may return a positive result under a third of the time. PCR sits near ninety-eight per cent. If your doctor reaches for a culture, ask for PCR instead.
And note what follows from this: a negative swab means very little on its own. The virus sheds intermittently. Swab on the wrong day, or on a lesion three days into healing, and you get a negative that proves nothing. I know this from the inside.
The waiting problem
If your exposure was recent, a blood test may be telling you about a body that has not caught up yet.
Antibodies take time to become detectable. Most people who seroconvert do so within a couple of months; the working threshold for a reliable negative is twelve weeks after the exposure, and some people take up to sixteen. A negative at three weeks is close to meaningless. A negative at twelve is worth something. A negative at sixteen is worth more.
Which means a great many people are sitting with a result that cannot yet answer the question they asked it. I have written about the timing question — when to test, what to do while waiting, and why a swab beats blood entirely if you have a sore right now — here.
Getting to certainty
When a result is genuinely uncertain, there is one test that settles it: the Western Blot, run at the University of Washington. It looks at the full range of antibody proteins rather than a single one, and false positives are essentially not a feature of it.
Two things to know. It has become more important recently, not less — the rapid confirmatory test that used to serve as an alternative has been discontinued, which leaves the Western Blot standing more or less alone. And it takes effort to obtain. It is not FDA-approved, it will never appear on a routine panel, a doctor has to order it specifically, and depending on where you are, you may have to arrange the blood draw and shipping yourself. Costs vary and can run into several hundred dollars once everything is counted.
Whether it is worth that trouble depends entirely on your situation. I have set out the practical side — how to obtain it, what it costs, and the cases where I think it is not worth pursuing — here.
Now the thing that makes my blood boil
Many doctors, handed a positive IgG, will tell the patient they have “been exposed to herpes.”
This is misleading in the extreme. If you have type-specific IgG antibodies, your immune system has mounted a response to the virus. The virus is in your body. It is not a visitor who may or may not have stayed. The word “exposed” makes it sound as though you brushed past something in a crowd.
That language does real damage. It encourages denial. It postpones treatment. It leaves people making decisions about their partners on the basis of a fiction.
If a doctor tells you that you have been exposed, ask them directly: does this mean I carry the virus? The answer will be yes. Demand clarity. Your health and the health of the people you are close to depend on it.
What the number is, and what it is not
A test result tells you which virus you carry, and roughly how confident the laboratory is about that.
It does not tell you where it lives, how often you will have symptoms, how contagious you are, what triggers you, or what your life looks like from here. Those questions are not answered by a lab. They are answered by looking at the whole of a person — sleep, stress, digestion, immune function, history, what a body has been carrying and for how long.
That is the work, and it does not come out of a bottle. There is no single herb, no diet, no supplement that resolves this for everyone, and anyone selling you one is selling you something. What actually helps is a custom-tailored plan built around your particular body and your particular pattern. Thirty-nine years as a herbalist have not shown me a shortcut around that.
If you are holding a result you do not understand, or you understand it and want to know what comes next, we can talk. I offer an Initial Consultation by phone or video where we go through your history properly and work out what your situation actually calls for.
You can also write to me with your questions at christopher.scipio@gmail.com. I read them and I answer them myself.
Christopher Scipio is a Registered Herbalist (RH, AHG) and Holistic Viral Specialist based in Vancouver, British Columbia, working with clients around the world. He has practised as a herbalist for thirty-nine years, twenty-three of them as a herpes specialist, and has lived with the virus himself for thirty-six years. He is the author of Making Peace With Herpes.