There is a set number of weeks from consultation to being admitted which varies from area to area
Actually the number of weeks is a stipulation by the
Guide to NHS waiting times in England.
It says this:
The maximum waiting time for non-urgent consultant-led treatments is 18 weeks from the day your appointment is booked through the NHS e-Referral Service, or when the hospital or service receives your referral letter.
However, your right to an 18-week waiting time does not apply if:
you choose to wait longer
delaying the start of your treatment is in your best clinical interests – for example, where stopping smoking or losing weight is likely to improve the outcome of the treatment
it is clinically appropriate for your condition to be actively monitored in secondary care without clinical intervention or diagnostic procedures at that stage
you fail to attend appointments that you had chosen from a set of reasonable options
the treatment is no longer necessary
You have the legal right to ask to be seen or treated by a different provider if you're likely to wait longer than the maximum waiting time specified for your treatment. The hospital or clinical commissioning group (CCG) will have to investigate and offer you a range of suitable alternative hospitals or clinics that would be able to see you sooner. If you're not happy with the organisation's response, you can complain using the
NHS complaints procedure.
Waiting times may vary between hospitals, and you should consider this when choosing a hospital.
When you are referred for your first outpatient appointment, the
NHS e-Referral Service lets you book the appointment at a hospital or clinic of your choice, on a date and at a time that suits you.
You can compare waiting times for hospitals on this site. Simply select hospitals from the
Services near you dropdown at the top of any page. Select the "Surgical Procedures" tab and enter a treatment and postcode into the search field.
Note: Waiting times shown are for the speciality or service that the procedure sits under as a whole. For example, if you look up hip replacement, you will find the average waiting time for an orthopaedics
inpatient at that hospital.
The length of time you wait will depend on your specific treatment and clinical needs, and you could be seen quicker or wait longer than this average waiting time.