# Advanced Therapies - Therapeutic Plasma Exchange/Plasmapheresis Procedure with EH Diagnostics, Treatment, & Labs

> Preparation Instructions for your Therapeutic Plasma Exchange/Plasmapheresis appointment: Please eat a healthy meal before your procedure to help you feel your best. Begin hydrating heavily at least two days in advance to prepare your body. On the day of your Plasmapheresis treatment, our clinical team will perform a physical assessment to ensure your veins can accommodate the large-gauge IVs required for filtering and replacing your blood. We will also confirm that you’ve eaten and had fluids prior to starting the treatment. If you need to cancel, kindly do so at least 24 hours in advance to avoid our $2000 Plasmapheresis cancellation fee. You can reach us by text at 929-556-6647 or email at concierge@extension.health.To help us stay on schedule, please arrive 10 minutes prior to your appointment time.

- Host: EH Diagnostics, Treatment, & Labs
- Duration: 180 min
- Location: In Person (Organizer Address)
- Host time zone: America/New_York
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://extension-health.cal.com/proto/plasmaphersis
- Event type id: 4111419

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=4111419&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

```http
POST https://api.cal.com/v2/bookings
cal-api-version: 2026-02-25
Content-Type: application/json

{
  "eventTypeId": 4111419,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `notes` (Additional notes), `guests` (Add guests)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.