Best Herpes Testing Center in Kathmandu PCR for Lesions, Serology for Everything Else
Herpes testing is method-specific to a degree other STI testing is not — the right test depends entirely on whether a lesion is present. Thamel Clinic runs both correctly: lesion PCR while ulcers are fresh, type-specific serology when they are not.
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Reviewed by: STD Specialist (MBBS, MD - Medicine)
NMC Registration:
Last medical review: June 1, 2026
This content follows evidence-based medical guidelines and is regularly updated to reflect current medical practices.
Testing Errors We Correct
- Serology during first outbreak — antibodies take weeks; a negative early IgG after a lesion is expected, not reassuring.
- IgM testing misused — HSV IgM is unreliable for adult diagnosis and routinely misread; type-specific IgG is the correct serology.
- Swabbing healed lesions — PCR needs an active lesion; healed skin returns nothing.
- Serology read without context — an HSV-1 positive causing needless panic in someone whose cold sores were oral.
The Two-Method Logic of Herpes Testing
Herpes is the STI where test selection depends on timing more than anywhere else: a lesion present → PCR swab is definitive; no lesion → type-specific serology detects past infection. Swabbing a healed ulcer is useless; drawing blood during a first episode is premature (antibodies take weeks to develop). Getting the method right is the entire test.
There is also honest nuance unique to HSV testing: serology cannot locate the infection (a positive HSV-1 could be a childhood cold sore, not genital), it cannot date it, and in low-risk people it produces meaningful false positives. Interpretation against your actual history — that is why a doctor reads these results rather than a report slip.
This page covers the methods, when each applies, the accuracy picture, and how results are interpreted.
The Two Methods
Lesion PCR — during an outbreak
A swab of an active blister/ulcer — definitive while lesions are fresh. The most accurate herpes test there is; type (HSV-1/2) returned with it.
Type-specific serology — between outbreaks
HSV-1 and HSV-2 IgG blood tests detect past infection when no lesion exists. Takes weeks to develop after first infection; cannot locate or date it.
Examination — always available
A characteristic fresh outbreak is often diagnosable clinically — the doctor's eye on an active lesion is real diagnostic evidence.
Timing & Windows
- Lesion PCR: most reliable in the first 72 hours of a fresh lesion.
- Serology lag: IgG takes 3–12 weeks to develop after first infection — an early negative may need a repeat.
- Between outbreaks: serology remains reliable; waiting for a lesion is unnecessary if history suggests prior infection.
- Window honesty: a serology negative too early after exposure is provisional — scheduled for confirmation.
Interpreting HSV Results — the Nuances
HSV results carry unique interpretive traps: a positive HSV-1 IgG may reflect a childhood oral infection, not genital; a positive HSV-2 reliably indicates genital-area infection but not when acquired; low-positive indices can be false; and an IgM "positive" is often meaningless. The doctor interprets each result against the history — type, index, timing, symptoms — before anything is concluded.
A Testing Visit
- History + examination first — the lesion-vs-no-lesion question decides the method.
- Correct sampling — lesion swab or serology draw.
- Results in 24–48 hours (PCR) / 24–72 hours (serology).
- Doctor interpretation — type, timing and meaning explained.
- Positive → strategy session (episodic vs. suppressive, transmission counseling).
HSV Testing & Costs
| Service | What It Includes | Cost (NPR) |
|---|---|---|
| Consultation | Method selection, interpretation. | Rs. 450 |
| Lesion PCR | Active-outbreak swab. | Rs. 5,000 – 8,000 |
| HSV-1/HSV-2 IgG | Type-specific serology. | Rs. 2,500 – 4,500 |
| Clinical diagnosis | Examination of active lesions. | Included in consult |
| Repeat serology | Confirmatory where early/ambiguous. | Rs. 2,500 – 4,500 |
Correct method chosen by consultation.
Why Our HSV Testing Is Correct
- Method matched to timing — PCR for lesions, serology between.
- Type-specific serology — HSV-1 vs. HSV-2 distinguished.
- No misuse of IgM — the unreliable test correctly avoided.
- Interpretation included — the nuances a report slip cannot carry.
- Honest windows — early results scheduled for confirmation.
- Private throughout — discreet testing, sealed results.
Frequently Asked Questions
How is herpes tested without an active outbreak?
Type-specific serology — HSV-1 and HSV-2 IgG blood tests detect past infection. Developed over weeks after first exposure; early negatives may need repeating.
How is herpes tested during an outbreak?
Lesion PCR — a swab of the fresh blister/ulcer, definitive while the lesion is active and returning the type with the result.
Why not the IgM test?
HSV IgM is unreliable in adults — frequent false positives and cross-reactivity. Type-specific IgG is the correct serology; we explain rather than order the wrong one.
My HSV-1 came back positive — does that mean genital herpes?
Not necessarily — HSV-1 includes the very common oral cold-sore infection. Type alone does not locate the infection; the history and any lesion pattern matter.
When after exposure can I test?
Lesion PCR immediately if a lesion exists; serology reliably after ~3–12 weeks. An early serology negative is provisional.
Still have questions? Contact us or book an appointment for personalized guidance.
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Last Updated: October 19, 2026 |Clinic: Thamel Clinic |Licensed: Registered