The service is under a funding cloud and, for the first time in 11 years, the clinic is charging all clients for consultations.
The Southern Primary Health Organisation (SPHO) stopped funding the clinic in January and, since then, the Queenstown Medical Centre has subsidised consultations for New Zealanders aged under 25.
SPHO chief executive Ian Macara said funding for the clinic had previously come from the now defunct Wakatipu Health Organisation. That funding had "run out" in January.
A renewal of funding for the Wakatipu clinic is under review from the SPHO, the Southern DHB and the medical centre.
The clinic now charges school pupils $10 for a consultation - a nominal fee Mrs Hastie said was a financial barrier for economically co-dependent teenagers.
"We're going to see a huge rise in chlamydia rates, a huge rise in unwanted pregnancies," she said.
"It will knock out kids who think they've got a problem or think something's not right and who don't want to talk to their parents to come to somebody and say 'is this normal?
'"I'm really concerned for our local high school kids, because they need to have the support."
Mrs Hastie said last night Wakatipu High School was aware of the issue. Its PTA had held a meeting recently with interested parties.
It was hoped a petition might be started to "get some clout" behind the funding issue.
In an average year the clinic sees 2500 people - 2000 enrolled Wakatipu people were able to access the service free of charge, with the balance made up of the non-eligible, tourists, or people aged over 24.
Mrs Hastie, a sexual health clinical nurse specialist, said funding was "vital" because adolescents were "notoriously" uncomfortable visiting GPs with sexual health problems.
"If there's not a service available for our young people, where are they going to go?"
Mrs Hastie said the resort's demographic was "skewed" towards youth, particularly those working in tourism and hospitality.
"They're kind of the bones of our town, and it is a party town - there's a high possibility they're going to have a liaison with a tourist, or someone from out of town and that brings a whole different issue of the pool of infection."
At the end of last winter, clinical staff noticed a "mini outbreak" of about 20 Queenstown 18 to 22-year-olds infected with trichomoniasis - an STI which can increase the risk of HIV infection and heighten chances of contracting prostate and cervical cancer.
"It's a bug that we don't normally see here and it's commonly a bug that's brought into a community," Mrs Hastie said.
"Nationally, we're seeing a rise in people with HIV, we're seeing a rise in syphilis - syphilis is all about migrating people, people on the move," she said.
Unlike other similar sized towns, Queenstown had a different sexual health landscape because of its transient population, she said.
The service was vital and needed to be be publicly funded, whether through the Southern District Health Board or the SPHO, she said.
Gore and Invercargill both have DHB-funded free sexual health clinics for those under 25 and Mrs Hastie cannot understand why the resort should be an exception.
"What is the difference with Queenstown?" she asked.
SDHB finance and funding general manager Robert Mackway-Jones said the board had received a letter from rhe Queenstown Medical Centre and was encouraging the SPHO and the clinic to resolve the funding issue with "ongoing dialogue".
He would not comment further as he did not want to "pre-empt the outcome" of the talks.
