Best Herpes Test in Kathmandu — Lesion PCR & Typed Serology The Right Test for the Question — Fresh Lesions vs Antibody Status

Herpes Testing — Two Different Questions

Herpes testing answers two different questions with two different tests — and confusing them produces wrong answers. The first question is "is this lesion herpes right now" — answered by PCR on a swab from a fresh sore, most reliable acute diagnostic, working best within ~2–12 days of a fresh lesion appearing.

The second question is "have I been exposed to HSV-1 or HSV-2" — answered by typed serology (blood test for type-specific antibodies), which detects exposure that has had time (~3–12 weeks) to produce antibodies. Serology cannot date an infection, cannot tell a recent exposure from an old one, and cannot identify a current lesion.

The right test for your question matters more than test itself — a PCR on a healing lesion produces a false negative; a serology done too early produces a false negative; and a serology positive does not prove lesion you have now is herpes.

Lesion PCR — the Acute Test

For a fresh lesion — a blister, sore or ulcer you suspect is herpes — test is a swab from lesion itself for PCR. Viral DNA is abundant in a fresh lesion, making this most reliable acute diagnostic and definitive answer to "is this herpes".

Timing matters: test works best within ~2–12 days of a fresh lesion appearing — a healed or healing lesion carries less virus and is more likely to produce a false negative. For a lesion currently present, attending promptly while it is fresh gives best diagnostic answer.

Typed Serology — the Exposure Test

Type-specific serology (blood test for HSV-1 and HSV-2 antibodies) answers whether you have been exposed — useful for patients without a current lesion who want to know their status, for serodiscordant-couple assessment (where one partner has herpes and other's status matters), and for interpreting a history of undiagnosed symptoms.

The limits are honest: serology cannot date an infection (a positive could be years old or recent — it does not say), cannot diagnose a current lesion (antibodies lag lesion by weeks), and needs ~3–12 weeks post-exposure to be reliable. An early serology negative does not exclude recent infection.

Which Test for Which Situation

Fresh lesion present → lesion PCR — answer for "is this herpes". No current lesion but want status → typed serology — answer for "have I been exposed". Recent exposure under ~3 weeks and no lesion → probably neither will help reliably yet; honest answer is to wait for serology window or attend if a lesion appears.

The commonest error is using serology to diagnose a lesion (a positive serology does not prove lesion is herpes — many people are seropositive; lesion might be something else) and using PCR on a healing lesion (false negative). The consultation chooses correctly.

Interpreting the Result

A positive lesion PCR confirms herpes — and typing (HSV-1 vs HSV-2) matters for prognosis because HSV-2 recurs more often. A negative PCR on a healing lesion may be a false negative; repeat or serology considered.

A positive serology means prior exposure — very common, not a crisis; interpretation covers what it does and does not mean. A negative serology inside window is inconclusive. Results are interpreted against timing, lesion status and clinical picture — not just reported.

Herpes Testing & Costs

Transparent pricing; confirm when booking.

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