Youthline's healthcare service is set to close on May 4, unless urgent funding can be found.

A health service team supporting vulnerable, young New Zeleanders is "devastated" to be closing its doors on May 4 - unless emergency funding can be found.

Youthline's Youth Health Service is a free central Auckland clinic offering primary health care to communities in need, including those from low socio-economic areas, the homeless, Maori and Pacific Island youth, and GLBTI.

The service was created to break down the barriers people face when seeking assistance with health problems, such as the inability to pay for a consult or prescription, and not having the transport to get help.

To keep afloat, the service needs an immediate boost of $50,000, which will ensure continued delivery of GP and school-based services.

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Youthline CEO Stephen Bell says they're committed to doing all they can to prevent closure, and are hoping to find support from both the corporate sector and the public.

"Our medical team is devastated that we may lose our ability to support the welfare and health of the most marginalised members of our community," Mr Bell said.

"We know from the huge influx of clients that we provide a vital service."

The clinic has seen patients as young as 12, who may have otherwise fallen through the gaps in our healthcare system.

Almost half of those seeking help suffered physical health concerns and more than a quarter needed support for sexual health issues. A further 14 per cent of patients sought help for mental health conditions.

"In a sample of recent cases - including very serious health issues which would have gone undetected - the centre has been crucial in changing the lives of people who might not otherwise seek help."

To make a $3 donation to Youthline's Youth Health Service, text YHS to 4499 or visit www.youthline.co.nz/donate-and-help-youthline/donate